Skip to main content
PlantRef
Home
Study
Care
Tools
New
Daily Plant
Search
Sign In
Join
Sign Up
Sign Up Free
PlantRef
Sign In
Sign Up Free
Study
Care
Tools
New
Daily
Search
New
Plants
My Dashboard
Workspaces
All Plants
Abelia (Abelias)
Abelia × grandiflora (Glossy Abelia)
Abelia × grandiflora 'Edward Goucher' (Edward Goucher abela)
Abelia × grandiflora 'Kaleidoscope' (Kaleidoscope Abelia)
Abelia grandiflora 'Kaleidoscope' (Kaleidoscope Glossy Abelia)
Abelia × grandiflora 'Sunrise' (Sunrise Glossy Abelia)
Abeliophyllum
Abeliophyllum distichum (White Forsythia)
Abies (firs)
Abies amabilis (Pacific Silver Fir)
Abies balsamea (Balsam Fir)
Abies balsamea 'Nana' (Dwarf Balsam Fir)
Abies borisii-regis (Bulgarian Fir)
Abies concolor (white fir)
Abies delavayi (Delavay Fir)
Abies fraseri (Fraser Fir)
Abies grandis (grand fir)
Abies koreana (Korean fir)
Abies koreana 'Kohout's Ice Breaker' (Kohout's ice breaker fir)
Abies koreana 'Silberlocke' (Silberlocke Korean Fir)
Abies lasiocarpa (alpine fir)
Abies magnifica (California Red Fir)
Abies numidica (Algerian Fir)
Abies pinsapo (Spanish fir)
Abies pinsapo 'Glauca' (Blue Spanish Fir)
Abies procera (Noble Fir)
Abies procera 'Glauca' (Blue Noble Fir)
Abronia
Abronia latifolia (Yellow Sand Verbena)
Abronia umbellata (Pink Sand Verbena)
Abronia villosa (desert sand verbena)
Abrus
Abrus precatorius (rosary pea)
Abutilon (Indian mallows)
Abutilon fruticosum (sweet Indian Mallow)
Abutilon theophrasti (velvetleaf)
Acacia (wattles)
Acacia acinacea (Round-leaf Wattle)
Acacia baileyana (Cootamundra wattle)
Acacia brownii (heath wattle)
Acacia complanata (flat-stemmed wattle)
Acacia dealbata (Silver wattle)
Acacia decurrens (Sydney green wattle)
Acacia disparrima (Southern Salwood)
Acacia falcata (sickle wattle)
Acacia fimbriata (Brisbane wattle)
Acacia floribunda (Weeping Acacia)
Acacia genistifolia (Spreading Wattle)
Acacia gunnii (ploughshare wattle)
Acacia implexa (Lightwood)
Acacia irrorata (green wattle)
Acacia iteaphylla (Flinders Range Wattle)
Acacia leiocalyx (black wattle)
Acacia ligulata (Dune Wattle)
Acacia linifolia (Flax-leaved Wattle)
Acacia longifolia (Longleaf Wattle)
Acacia maidenii (Maiden's Wattle)
Acacia mearnsii (black wattle)
Acacia melanoxylon (blackwood)
Acacia mucronata (Variable sallow wattle)
Acacia myrtifolia (Myrtle Wattle)
Acacia oxycedrus (Spike Wattle)
Acacia paradoxa (Kangaroo thorn)
Acacia parramattensis (Parramatta Green Wattle)
Acacia podalyriifolia (Queensland silver wattle)
Acacia pulchella (Prickly Moses)
Acacia pycnantha (Golden Wattle)
Acacia salicina (Willow Acacia)
Acacia saligna (golden wreath wattle)
Acacia spinescens (spiny wattle)
Acacia stenophylla
Acacia stricta (Hop wattle)
Acacia suaveolens (Sweet Wattle)
Acacia terminalis (Sunshine Wattle)
Acacia ulicifolia (juniper wattle)
Acacia verniciflua (Varnish Wattle)
Acacia verticillata (Prickly moses)
Acaena (Bidibid)
Acaena echinata (Sheep's Burr)
Acaena novae-zelandiae (Biddy-biddy)
Acalypha (three-seeded mercuries)
Acalypha persimilis (hornbeam copperleaf)
Acalypha rhomboidea (Common Three-seeded Mercury)
Acanthocereus
Acanthocereus tetragonus (Fairy Castle Cactus)
Acanthus (Acanthus)
Acanthus mollis (bear's breech)
Acanthus spinosus (Spiny Bear's Breeches)
Acer (maples)
Acer buergerianum (Trident Maple)
Acer campestre (Field Maple)
Acer capillipes (Snakebark Maple)
Acer circinatum (Vine maple)
Acer cissifolium (Ivy-leaved Maple)
Acer crataegifolium (Hawthorn-leaved Maple)
Acer davidii (snakebark maple)
Acer floridanum (southern sugar maple)
Acer × freemanii 'Jeffersred' (Autumn Flame Maple)
Acer ginnala (Amur Maple)
Acer glabrum (Douglas Maple)
Acer grandidentatum (bigtooth maple)
Acer griseum (paperbark maple)
Acer macrophyllum (bigleaf maple)
Acer monspessulanum
Acer negundo (Box Elder)
Acer nigrum (black maple)
Acer palmatum (Japanese maple)
Acer palmatum 'Atropurpureum' (red Japanese maple)
Acer palmatum 'Bloodgood' (Bloodgood Japanese Maple)
Acer palmatum 'Crimson Queen' (Crimson Queen Japanese Maple Tree)
Acer palmatum 'Osakazuki' (Osakazuki Japanese Maple)
Acer palmatum 'Red Dragon' (Red Dragon Japanese Maple)
Acer palmatum 'Seiryû' (Seiryu Japanese Maple)
Acer palmatum 'Shaina' (Shaina Japanese Maple)
Acer palmatum 'Shishigashira' (Lion's Head Japanese Maple)
Acer palmatum var. dissectum (laceleaf Japanese maple)
Acer palmatum var. dissectum 'Dissectum Atropurpreum' (weeping red laceleaf Japanese maple)
Acer palmatum 'Viridis' (Viridis Japanese Maple)
Acer palmatum 'Waterfall' (Waterfall Japanese Maple Tree)
Acer palmatum 'Wolff' (Wolff Japanese Maple)
Acer pensylvanicum (striped maple)
Acer pictum (Painted Maple)
Acer platanoides (Norway maple)
Acer platanoides 'Crimson King' (Crimson King maple)
Acer platanoides 'Royal Red' (Royal Red Norway Maple Tree)
Acer pseudoplatanus (sycamore maple)
Acer pseudoplatanus 'Atropurpureum' (Purple Sycamore Maple)
Acer pseudoplatanus 'Leopoldii' (Leopoldii Sycamore Maple)
Acer pseudosieboldianum (Korean Maple)
Acer rubrum (red maple)
Acer rubrum 'October Glory' (October Glory Red Maple Tree)
Acer saccharinum (silver maple)
Acer saccharum (sugar maple)
Acer saccharum 'Green Mountain' (Green Mountain Sugar Maple Tree)
Acer shirasawanum 'Aureum' (Golden Full Moon Maple)
Acer shirasawanum 'Autumn Moon' (Autumn Moon Maple)
Acer sieboldianum (Siebold Maple)
Acer spicatum (Mountain Maple)
Acer tataricum subsp. ginnala (Amur maple)
Acer tegmentosum (Manchurian Striped Maple)
Acer tegmentosum 'Joe Witt' (Joe Witt Striped Maple)
Acer triflorum (Three-flower Maple)
Acer truncatum (Shantung Maple)
Achillea (yarrows)
Achillea ageratifolia (Greek Yarrow)
Achillea filipendulina (Fern-leaf Yarrow)
Achillea millefolium (common yarrow)
Achillea millefolium 'Cerise Queen'
Achillea millefolium 'Paprika' (Paprika Yarrow)
Achillea × 'Moonshine' (Moonshine Yarrow)
Achillea ptarmica (Sneezewort)
Achillea × 'Terracotta' (Terracotta Yarrow)
Achlys
Achlys triphylla (vanilla-leaf)
Achyrachaena
Achyrachaena mollis (Blow Wives)
Acianthus
Acianthus caudatus (Mayfly orchid)
Acianthus fornicatus (Pixie Caps)
Acianthus pusillus (small mosquito-orchid)
Acmella (spotflowers)
Acmella repens (Oppositeleaf Spotflower)
Acmispon (deervetch)
Acmispon americanus (Spanish clover)
Acmispon glaber (deerweed)
Acmispon strigosus (strigose lotus)
Aconitum (Monkshoods)
Aconitum bicolor (Bicolor Monkshood)
Aconitum carmichaelii (Azure Monkshood)
Aconitum columbianum (Columbian Monkshood)
Aconitum hemsleyanum (Climbing Monkshood)
Aconitum napellus (Common Monkshood)
Acorus gramineus 'Ogon' (Golden Variegated Sweet Flag)
Acronychia
Acronychia imperforata (Beach Acronychia)
Acronychia laevis (glossy acronychia)
Acrostichum
Acrostichum danaeifolium (Giant leather fern)
Acrotriche
Acrotriche aggregata (Ground Berry)
Acrotriche serrulata (Honey-pots)
Actaea (baneberries and cohoshes)
Actaea pachypoda (White Baneberry)
Actaea racemosa (Black Cohosh)
Actaea rubra (red baneberry)
Actaea simplex 'Black Negligee' (Black Negligee Bugbane)
Actinidia
Actinidia deliciosa (kiwi)
Actinidia kolomikta (same)
Actinotus
Actinotus helianthi (Flannel Flower)
Actinotus minor (Lesser Flannel Flower)
Adelinia
Adelinia grandis (Pacific hound's tongue)
Adenanthos
Adenanthos sericeus
Adenanthos terminalis (Gland Flower)
Adenium
Adenium obesum (Desert Rose)
Adenocaulon
Adenocaulon bicolor (American trailplant)
Adenostoma
Adenostoma fasciculatum (chamise)
Adesmia
Adiantum aethiopicum (common maidenhair fern)
Adiantum aleuticum (western maidenhair fern)
Adiantum capillus-veneris (black maidenhair fern)
Adiantum formosum (Giant maidenhair fern)
Adiantum hispidulum (Rough Maidenhair Fern)
Adiantum jordanii (California Maidenhair Fern)
Adiantum pedatum (Northern Maidenhair Fern)
Adiantum raddianum (Maidenhair Fern)
Adiantum venustum (Himalayan maidenhair fern)
Adonidia
Adonidia merrillii (Christmas Palm)
Adoxa
Adoxa moschatellina (Moschatel)
Aechmea
Aechmea fasciata (Silver Vase Bromeliad)
Aegiceras
Aegiceras corniculatum (river mangrove)
Aegopodium
Aegopodium podagraria (Goutweed)
Aeonium (tree houseleeks)
Aeonium arboreum (Tree Aeonium)
Aesculus (buckeyes and horse-chestnuts)
Aesculus californica (California Buckeye)
Aesculus × carnea 'Briotii' (red horse chestnut)
Aesculus chinensis (Chinese Horse Chestnut)
Aesculus flava (Yellow Buckeye)
Aesculus glabra (Ohio Buckeye)
Aesculus hippocastanum (horse chestnut)
Aesculus indica (Indian Horse Chestnut)
Aesculus parviflora (Bottlebrush Buckeye)
Aesculus pavia (Red Buckeye)
Aesculus turbinata (Japanese Horse Chestnut)
Aethusa
Aethusa cynapium (Fool's parsley)
Agalinis (false foxgloves)
Agalinis heterophylla (Prairie False Foxglove)
Agalinis purpurea (purple false foxglove)
Agalinis tenuifolia (slender false foxglove)
Agapanthus africanus (lily of the Nile)
Agapanthus praecox (blue lily)
Agastache (Hyssops)
Agastache 'Black Adder' (Black Adder Hummingbird Mint)
Agastache 'Blue Fortune' (Blue Fortune Hummingbird Mint)
Agastache foeniculum (Anise Hyssop)
Agastache rupestris (Sunset Hyssop)
Agastache spp. (hyssop)
Agastache urticifolia (nettle-leaf giant hyssop)
Agathosma (Buchus)
Agave (century plants)
Agave americana (Century Plant)
Agave americana 'Variegata' (Variegated Century Plant)
Agave attenuata (Fox Tail Agave)
Agave × 'Blue Glow' (Blue Glow Agave)
Agave deserti (desert agave)
Agave geminiflora (Twin Flower Agave Plant)
Agave palmeri (Palmer's agave)
Agave parryi var. couesii (Coues Agave)
Agave vilmoriniana (Octopus Agave)
Ageratina (snakeroots)
Ageratina adenophora (Crofton Weed)
Ageratina altissima 'Chocolate' (Chocolate White Snakeroot)
Ageratina havanensis (Shrubby boneset)
Ageratina riparia (mist flower)
Ageratum (Ageratums)
Ageratum houstonianum (Flossflower)
Aglaonema (Chinese evergreens)
Aglaonema commutatum (Chinese Evergreen)
Agonis
Agonis flexuosa (Western Australian Peppermint)
Agoseris (mountain dandelions)
Agrimonia (agrimonies)
Agrimonia eupatoria (common agrimony)
Agrimonia gryposepala (tall hairy agrimony)
Agrimonia parviflora (swamp agrimony)
Agropyron
Agropyron cristatum (Crested Wheatgrass)
Agrostemma
Agrostemma githago (corn cockle)
Agrostis (bent grass)
Agrostis gigantea (redtop)
Ailanthus
Ailanthus altissima (tree of heaven)
Aira
Aira praecox (early hair grass)
Aizoon
Aizoon pubescens (Coastal Galenia)
Ajuga (Bugles)
Ajuga australis (Austral Bugle)
Ajuga reptans (creeping bugleweed)
Ajuga reptans 'Black Scallop'
Ajuga reptans 'Chocolate Chip' (Chocolate Chip Bugleweed)
Akebia
Akebia quinata (five-leaved akebia)
Albizia (Mimosa, silk trees, false-thorns, and allies)
Albizia julibrissin (silk tree)
Albuca (Slimelilies)
Alcea (hollyhocks)
Alcea rosea (common hollyhock)
Alchemilla (Lady's-mantles)
Alchemilla alpina (Alpine Lady's-mantle)
Alchemilla arvensis (Field Parsley Piert)
Alchemilla conjuncta (Silver Lady's Mantle)
Alchemilla erythropoda
Alchemilla mollis (Lady's Mantle)
Alchemilla vulgaris (Lady's-mantle)
Alchornea
Alchornea ilicifolia (Native Holly)
Alectryon
Alectryon tomentosus (Hairy Alectryon)
Alisma (water-plantains)
Alisma plantago-aquatica (water-plantain)
Allamanda
Allamanda cathartica (Allamanda Vine)
Alliaria
Alliaria petiolata (garlic mustard)
Allionia
Allionia incarnata (Trailing Windmills)
Allium (onions)
Allium acuminatum (Hooker's Onion)
Allium × 'Ambassador' (Ambassador Allium)
Allium atropurpureum (Dark Purple Allium)
Allium canadense (Canadian Meadow garlic)
Allium cepa 'Australian Brown' (Australian Brown Onion)
Allium cepa 'Bridger' (Bridger Onion)
Allium cepa 'Cabernet' (Cabernet Red Onion)
Allium cepa 'Candy' (Candy Onion)
Allium cepa 'Copra' (Copra Onion)
Allium cepa 'Evergreen Hardy White' (Evergreen Hardy White Bunching Onion)
Allium cepa 'Granex' (Granex Onion)
Allium cepa 'Patterson' (Patterson Onion)
Allium cepa 'Red Baron' (Red Baron Scallion)
Allium cepa 'Red Candy Apple' (Red Candy Apple Onion)
Allium cepa 'Red Creole' (Red Creole Onion)
Allium cepa 'Red Wing' (Red Wing Storage Onion)
Allium cepa 'Superstar' (Superstar Onion)
Allium cepa 'Super Star' (Super Star Onion)
Allium cepa 'Texas Super Sweet' (Texas Super Sweet Onion)
Allium cepa 'Walla Walla' (Walla Walla Sweet Onion)
Allium cepa 'Yellow Granex' (Yellow Granex Onion)
Allium cepa 'Yellow Sweet Spanish' (Yellow Sweet Spanish Onion)
Allium cernuum (Nodding Onion)
Allium cristophii (Star of Persia)
Allium drummondii (Drummond's Onion)
Allium fistulosum (Welsh Onion (Scallions))
Allium fistulosum 'Evergreen Hardy White' (Evergreen Hardy White Bunching Onion)
Allium × 'Gladiator' (Gladiator Allium)
Allium 'Globemaster' (globemaster onion)
Allium hollandicum 'Purple Sensation' (Purple Sensation Allium)
Allium karataviense 'Ivory Queen' (Ivory Queen Allium)
Allium moly (Golden Garlic)
Allium 'Mount Everest' (Mount Everest Allium)
Allium obliquum
Allium paradoxum (Few-flowered Leek)
Allium × 'Pinball Wizard' (Pinball Wizard Allium)
Allium proliferum (tree onion)
Allium 'Red Giant' (Red Giant Ornamental Onion)
Allium roseum (rosy garlic)
Allium sativum 'California Early' (California Early Softneck Garlic)
Allium sativum 'Music' (Music Hardneck Garlic)
Allium schoenoprasum (Chives)
Allium schubertii (satellite onion)
Allium siculum
Allium sphaerocephalon (Drumstick Allium)
Allium tricoccum (wide leek)
Allium triquetrum (Three-cornered garlic)
Allium tuberosum (Garlic Chives)
Allium unifolium (one-leaved onion)
Allium ursinum (Ramsons)
Allium vineale (wild garlic)
Allocasuarina (sheoaks)
Allocasuarina humilis (dwarf sheoak)
Allocasuarina littoralis (Black sheoak)
Allocasuarina muelleriana (slaty sheoak)
Allocasuarina torulosa (Forest sheoak)
Allocasuarina verticillata (Drooping She-oak)
Allowissadula
Allowissadula holosericea (velvet-leaf mallow)
Alnus alnobetula (green alder)
Alnus cordata (Italian alder)
Alnus glutinosa (common alder)
Alnus incana (Mountain Alder)
Alnus rhombifolia (white alder)
Alnus rubra (red alder)
Alnus serrulata (smooth alder)
Alocasia (elephant's-ears)
Alocasia brisbanensis (Cunjevoi)
Alocasia odora (Upright Elephant Ear)
Alocasia reginula (Black Velvet Alocasia)
Alocasia zebrina (Zebra Alocasia)
Aloe (Aloes)
Aloe arborescens (Candelabra Aloe)
Aloe vera (Aloe Vera)
Alopecurus (Foxtail grasses)
Alopecurus geniculatus (Marsh foxtail)
Alopecurus pratensis (Meadow Foxtail)
Aloysia
Aloysia gratissima (Whitebrush)
Alphitonia
Alphitonia excelsa (Red Ash)
Alpinia (Shell Gingers)
Alpinia caerulea (Native Ginger)
Alpinia purpurata (Red Ginger)
Alstonia
Alstonia constricta (Bitterbark)
Alternanthera
Alternanthera denticulata (Lesser Joyweed)
Alternanthera ficoidea (Joseph's Coat)
Alternanthera philoxeroides (Alligatorweed)
Althaea
Althaea officinalis (marsh mallow)
Alyssum (Alyssum)
Alyxia
Alyxia buxifolia (Sea Box)
Alyxia ruscifolia (Chain Fruit)
Amaranthus (amaranths)
Amaranthus palmeri (Palmer's Amaranth)
Amaryllis
Amaryllis belladonna (Belladonna Lily)
Amauropelta
Amauropelta noveboracensis (New York fern)
Amblystegium
Amblystegium serpens (creeping feather-moss)
Ambrosia (Ragweeds)
Ambrosia acanthicarpa (Flatspine Bursage)
Ambrosia artemisiifolia (common ragweed)
Ambrosia chamissonis (silver beachweed)
Ambrosia deltoidea (triangle-leaf bursage)
Ambrosia dumosa (Burrobush)
Ambrosia psilostachya (western ragweed)
Ambrosia salsola (Cheesebush)
Ambrosia trifida (giant ragweed)
Amelanchier (serviceberries)
Amelanchier alnifolia (serviceberry)
Amelanchier arborea (common serviceberry)
Amelanchier grandiflora (Apple Serviceberry)
Amelanchier ssp. (serviceberry)
Amelanchier utahensis (Utah Serviceberry)
Amorpha
Amorpha canescens (leadplant)
Amorpha fruticosa (false indigo bush)
Ampelopsis (porcelainberry)
Ampelopsis cordata (heart leaf peppervine)
Ampelopsis glandulosa (Porcelain Berry)
Amperea
Amperea xiphoclada (Broom Spurge)
Amphiachyris
Amphiachyris dracunculoides (prairie broomweed)
Amphibolis
Amphibolis antarctica (Sea Nymph)
Amphicarpaea
Amphicarpaea bracteata (American hog-peanut)
Amsinckia (Fiddlenecks)
Amsinckia menziesii (Common Fiddleneck)
Amsinckia tessellata (Bristly Fiddleneck)
Amsonia (bluestars)
Amsonia × 'Blue Ice' (Blue Ice Bluestar)
Amsonia ciliata (Fringed Bluestar)
Amsonia hubrichtii (Arkansas Bluestar)
Amsonia illustris (Shining Bluestar)
Amsonia tabernaemontana (Eastern Bluestar)
Amsonia tabernaemontana var. salicifolia (Willow-leaf Bluestar)
Amyema
Amyema cambagei (needle-leaf mistletoe)
Amyema congener (variable mistletoe)
Amyema miquelii (Box Mistletoe)
Amyema pendula (drooping mistletoe)
Amyema preissii (wireleaf mistletoe)
Amyema quandang (grey mistletoe)
Anacamptis
Anacamptis morio (green-winged orchid)
Anacamptis pyramidalis (pyramidal orchid)
Anacardium
Anacardium occidentale (Cashew)
Ananas
Ananas comosus (Pineapple Plant)
Anaphalis (everlastings)
Anaphalis margaritacea (pearly everlasting)
Anaphalis triplinervis (Triple-Veined Pearly Everlasting)
Anasa
Anasa tristis (Squash Bug)
Anatherum (New World Bluestems)
Anatherum tenuispatheum (Maritime Bushy Bluestem)
Anatherum virginicum (broomsedge bluestem)
Anchusa (Alkanets)
Anchusa arvensis (small bugloss)
Anchusa azurea (Italian bugloss)
Anchusa officinalis (common bugloss)
Andersonglossum
Andersonglossum virginianum (wild comfrey)
Andromeda
Andromeda polifolia (Bog Rosemary)
Andropogon (bluestems)
Andropogon gerardi (big bluestem)
Andropogon gerardii (Big Bluestem)
Andropogon ternarius (Splitbeard Bluestem)
Andropogon virginicus (Broomsedge Bluestem)
Aneilema
Aneilema acuminatum (Pointed Aneilema)
Anemanthele
Anemanthele lessoniana (New Zealand Wind Grass)
Anemonastrum
Anemonastrum canadense (Canada anemone)
Anemone (anemones and thimbleweeds)
Anemone berlandieri (Tenpetal Anemone)
Anemone blanda (windflower)
Anemone coronaria (poppy anemone)
Anemone hupehensis 'September Charm' (September Charm Japanese Anemone)
Anemone leveillei
Anemone multifida
Anemone nemorosa (wood anemone)
Anemone virginiana (tall thimbleweed)
Anemone x hybrida (Japanese anemone)
Anemonoides
Anemonoides apennina (Blue Anemone)
Anemonoides blanda (Greek Anemone)
Anemonoides nemorosa (wood anemone)
Anemonoides quinquefolia (wood anemone)
Anemonoides ranunculoides (Yellow Anemone)
Anemonopsis
Anemonopsis macrophylla (False Anemone)
Anemopsis
Anemopsis californica (Yerba Mansa)
Anethum
Anethum graveolens (Dill)
Angelica (angelicas)
Angelica archangelica (Garden angelica)
Angelica atropurpurea (purple-stemmed angelica)
Angelica gigas (Korean Angelica)
Angelica sylvestris (Wild Angelica)
Angelonia
Angelonia angustifolia (Summer Snapdragon)
Angophora
Angophora costata (Smooth-barked apple)
Angophora floribunda (Rough-barked Apple)
Angophora hispida (Dwarf apple)
Angophora leiocarpa (Smooth-barked Apple)
Anigozanthos (Kangaroo paws)
Anigozanthos humilis (Catspaw)
Anigozanthos manglesii (Red and Green Kangaroo Paw)
Anisocarpus
Anisocarpus madioides (woodland madia)
Annona (custard apples)
Annona glabra (Pond Apple)
Annona muricata (Soursop)
Annona squamosa (Sugar Apple)
Anopterus
Anopterus glandulosus (Tasmanian laurel)
Anredera
Anredera cordifolia (Mignonette vine)
Antennaria (pussytoes)
Antennaria dioica 'Rubra'
Antennaria microphylla (Rosy Pussytoes)
Antennaria neglecta (Field Pussytoes)
Antennaria parlinii (Parlin's Pussytoes)
Antennaria parvifolia (small-leaf pussytoes)
Antennaria plantaginifolia (plantain-leaved pussytoes)
Antennaria rosea (Rosy Pussytoes)
Anthemis (Chamomiles)
Anthemis cotula (chamomile)
Anthericum
Anthericum ramosum
Anthoxanthum (sweetgrasses)
Anthoxanthum odoratum (sweet vernal grass)
Anthriscus (Chervils)
Anthriscus caucalis (Bur Parsley)
Anthriscus cerefolium (Chervil)
Anthriscus sylvestris (wild chervil)
Anthurium (anthuriums)
Anthurium andraeanum (Flamingo Flower)
Anthurium clarinervium (Velvet Cardboard Anthurium)
Anthyllis
Anthyllis vulneraria (Common Kidney-Vetch)
Anticlea
Anticlea elegans (Mountain Deathcamas)
Antigonon
Antigonon leptopus (Coral Vine)
Antirrhinum (Snapdragons)
Antirrhinum majus (snapdragon)
Aotus
Aotus ericoides (Common Aotus)
Aphananthe
Aphananthe philippinensis (Axe handle Wood)
Aphanostephus
Aphanostephus ramosissimus (Lazy Daisy)
Aphyllon
Aphyllon uniflorum (one-flowered cancer-root)
Apios
Apios americana (American groundnut)
Apium
Apium prostratum (Sea Celery)
Aplectrum
Aplectrum hyemale (putty root)
Apocissus
Apocissus antarctica (Kangaroo Vine)
Apocissus hypoglauca (Five-Leaved Water Vine)
Apocynum (dogbanes)
Apocynum androsaemifolium (Spreading Dogbane)
Apocynum cannabinum (hemp dogbane)
Apocynum × floribundum (intermediate dogbane)
Aponogeton
Aponogeton distachyos
Aponogeton natans (floating water hawthorn)
Apopellia
Apopellia endiviifolia (Endive Pellia)
Aptenia
Aptenia cordifolia (Livingstone Daisy)
Aquilegia (columbines)
Aquilegia canadensis (Wild Columbine)
Aquilegia coerulea (blue columbine)
Aquilegia formosa (Red Columbine)
Aquilegia vulgaris (columbine)
Aquilegia vulgaris var. stellata 'Black Barlow'
Arabidopsis
Arabidopsis lyrata (Lyreleaf Rockcress)
Arabidopsis thaliana (mouse-ear cress)
Arabis (Rock-cresses)
Arachis (peanuts)
Arachniodes
Arachniodes simplicior (Variegated Holly Fern)
Aralia (spikenards)
Aralia californica (California Spikenard)
Aralia elata (Japanese angelica tree)
Aralia nudicaulis (wild sarsaparilla)
Aralia racemosa (American spikenard)
Aralia spinosa (devil's walkingstick)
Araucaria (araucarias)
Araucaria araucana (Monkey Puzzle Tree)
Araucaria bidwillii (Bunya Pine)
Araucaria cunninghamii (Hoop pine)
Araucaria heterophylla (Norfolk Island Pine)
Araujia
Araujia sericifera (Moth Vine)
Arbutus (madrones)
Arbutus 'Marina' (Marina Strawberry Tree)
Arbutus menziesii (madrone)
Arbutus unedo (strawberry tree)
Arbutus x andrachnoides
Archontophoenix
Archontophoenix cunninghamiana (Piccabeen Palm)
Arctium (burdocks)
Arctium lappa (greater burdock)
Arctium minus (burrdock)
Arctium tomentosum (Woolly Burdock)
Arctostaphylos (bearberries and manzanitas)
Arctostaphylos columbiana (hairy manzanita)
Arctostaphylos densiflora (Sentinel Manzanita)
Arctostaphylos edmundsii (Pacific Mist Manzanita)
Arctostaphylos glandulosa (Eastwood's Manzanita)
Arctostaphylos glauca (Big Berry Manzanita)
Arctostaphylos hookeri (Mills Manzanita)
Arctostaphylos manzanita (Dr. Hurd Manzanita)
Arctostaphylos × media
Arctostaphylos patula (greenleaf manzanita)
Arctostaphylos pungens (pointleaf manzanita)
Arctostaphylos spp. (manzanita)
Arctostaphylos uva-ursi (kinnikinnick)
Arctostaphylos viscida (Whiteleaf Manzanita)
Arctotheca
Arctotheca calendula (Capeweed)
Arctotis (African Daisies)
Ardisia (marlberry)
Ardisia crenata (Coralberry)
Arenaria
Arenaria serpyllifolia (Thyme-leaved Sandwort)
Argemone (prickly poppies)
Argemone albiflora (white prickly poppy)
Argemone munita (flatbud prickly poppy)
Argemone platyceras
Argemone polyanthemos (thistle poppy)
Argentina (Silverweeds)
Argentina anserina (common silverweed)
Argentina pacifica (Pacific silverweed)
Argentipallium
Argentipallium obtusifolium (Blunt everlasting)
Argyranthemum
Aria
Aria edulis (Whitebeam)
Arisaema (jack-in-the-pulpits and cobra lilies)
Arisaema candidissimum (White Jack-in-the-pulpit)
Arisaema consanguineum (Cobra Lily)
Arisaema dracontium (green dragon)
Arisaema ringens (Japanese Cobra Plant)
Arisaema sikokianum (Shikoku Cobra Lily)
Arisaema taiwanense (Formosa Cobra Lily)
Arisaema triphyllum (Jack-in-the-pulpit)
Arisarum
Arisarum proboscideum (Mouse Plant)
Aristea (Blue Brilliant)
Aristida (threeawns and wiregrasses)
Aristida purpurea (Purple Threeawn)
Aristolochia (pipevines and birthworts)
Aristolochia californica (California Dutchman's Pipe)
Armeria (Thrift)
Armeria maritima (sea thift)
Armeria maritima 'Victor Reiter' (Victor Reiter Sea Thrift)
Armoracia
Armoracia rusticana (Horseradish)
Arnica
Arnica chamissonis (Meadow Arnica)
Arnica cordifolia (heartleaf arnica)
Arnoglossum
Arnoglossum atriplicifolium (pale Indian plantain)
Arnoglossum plantagineum (prairie Indian plantain)
Aronia (chokeberries)
Aronia arbutifolia (red chokeberry)
Aronia melanocarpa (Chokecherry)
Aronia melanocarpa 'Viking' (Viking Aronia Chokeberry)
Aronia × prunifolia (purple chokeberry)
Arrhenatherum
Arrhenatherum elatius (tall oat grass)
Artemisia (wormwoods and sagebrushes)
Artemisia abrotanum (Southernwood)
Artemisia californica (California sagebrush)
Artemisia caudata (Beach Wormwood)
Artemisia douglasiana (California mugwort)
Artemisia dracunculus (French Tarragon)
Artemisia filifolia (sand sagebrush)
Artemisia frigida (fringed sagebrush)
Artemisia lactiflora (White Mugwort)
Artemisia ludoviciana (Silver Wormwood)
Artemisia mauiensis 'Makana Silver'
Artemisia pontica (Roman Wormwood)
Artemisia 'Powis Castle' (Powis Castle Artemisia)
Artemisia pycnocephala (coastal sagewort)
Artemisia suksdorfii (Coastal Mugwort)
Artemisia tridentata (Big Sagebrush)
Artemisia vulgaris (common mugwort)
Arthropodium
Arthropodium candidum (White Rock Lily)
Arthropodium fimbriatum (Nodding Chocolate Lily)
Arthropodium milleflorum (pale vanilla lily)
Arthropodium strictum (chocolate lily)
Arthropteris
Arthropteris tenella (Climbing Fern)
Artocarpus
Arum (arum lilies)
Arum italicum (lords and ladies)
Arum maculatum (Cuckoo-pint)
Aruncus
Aruncus aethusifolius
Aruncus dioicus (goatsbeard)
Arundinaria (Canes)
Arundinaria gigantea (river cane)
Arundinaria tecta (switch cane)
Arundo
Arundo donax (giant reed)
Asarum (wild gingers)
Asarum arifolium (Little Brown Jugs)
Asarum caudatum (Wild Ginger)
Asarum europaeum (European Wild Ginger)
Asarum reflexum (Reflexed Wild Ginger)
Asarum splendens (Chinese Wild Ginger)
Asclepias (milkweeds)
Asclepias amplexicaulis (clasping milkweed)
Asclepias asperula (Antelopehorn Milkweed)
Asclepias cordifolia (heart-leaf milkweed)
Asclepias curassavica (tropical milkweed)
Asclepias eriocarpa (woollypod milkweed)
Asclepias exaltata (poke milkweed)
Asclepias fascicularis (Narrow-leaf Milkweed)
Asclepias humistrata (Sandhill milkweed)
Asclepias incarnata (Swamp Milkweed)
Asclepias incarnata 'Ice Ballet' (Ice Ballet Swamp Milkweed)
Asclepias latifolia (broadleaf milkweed)
Asclepias oenotheroides (Zizotes milkweed)
Asclepias perennis (Aquatic Milkweed)
Asclepias purpurascens (purple milkweed)
Asclepias quadrifolia (four-leaved milkweed)
Asclepias speciosa (Showy Milkweed)
Asclepias spp. (Native Milkweed Selections)
Asclepias syriaca (common milkweed)
Asclepias tuberosa (Butterfly Weed)
Asclepias variegata (redring milkweed)
Asclepias verticillata (Whorled Milkweed)
Asclepias viridiflora (green comet milkweed)
Asclepias viridis (green antelopehorns)
Asimina
Asimina parviflora (Small-Flower Pawpaw)
Asimina × piedmontana
Asimina reticulata (netted pawpaw)
Asimina triloba (Pawpaw)
Aspalathus (Aspalathuses)
Asparagus (Asparagus)
Asparagus aethiopicus (African Asparagus)
Asparagus asparagoides (Cape Smilax)
Asparagus densiflorus 'Myersii' (Foxtail Fern)
Asparagus officinalis (wild asparagus)
Asparagus scandens (Climbing asparagus)
Asparagus setaceus (Asparagus Plumosa Fern)
Asperula
Asperula conferta (Common Woodruff)
Asphodelus (asphodels)
Asphodelus fistulosus (Onion-Leafed Asphodel)
Aspidistra
Aspidistra elatior (Cast Iron Plant)
Asplenium (Spleenworts)
Asplenium adiantum-nigrum (black spleenwort)
Asplenium australasicum (Bird's nest fern)
Asplenium ceterach (Rustyback)
Asplenium flabellifolium (Necklace Fern)
Asplenium marinum (sea spleenwort)
Asplenium nidus (Bird's Nest Fern)
Asplenium platyneuron (ebony spleenwort)
Asplenium rhizophyllum (walking fern)
Asplenium ruta-muraria (wall-rue)
Asplenium scolopendrium (Harts Tongue Fern)
Asplenium scolopendrium 'Angustatum'
Asplenium trichomanes (Maidenhair Spleenwort)
Aster (true asters)
Aster novi-belgii (New York Aster)
Aster spp. (aster)
Aster tataricus 'Jindai' (Jindai Aster)
Astilbe (false goat's beards)
Astilbe 'Amethyst' (Amethyst Astilbe)
Astilbe × arendsii 'Fanal' (Fanal Astilbe)
Astilbe chinensis 'Vision in Pink' (Vision in Pink Chinese Astilbe)
Astilbe chinensis 'Vision in White' (Vision in White Chinese Astilbe)
Astilbe × japonica 'Deutschland' (Deutschland Astilbe)
Astilbe japonica 'Europa'
Astilbe × japonica 'Rheinland' (Rheinland Astilbe)
Astilbe spp. (astilbe)
Astragalus (milkvetches)
Astragalus lentiginosus (Freckled Milkvetch)
Astragalus purshii (woollypod milkvetch)
Astragalus trichopodus (Santa Barbara Milkvetch)
Astrantia
Astrantia major (Great Masterwort)
Astrantia major 'Roma' (Roma Masterwort)
Astrantia major 'Rubra' (Rubra Masterwort)
Astrantia major 'Ruby Wedding' (Ruby Wedding Masterwort)
Astrantia major 'Sunningdale Variegated' (Sunningdale Variegated Masterwort)
Astrantia major 'Venice'
Astrantia maxima (Large Masterwort)
Astrotricha
Astrotricha latifolia (Broad-leaf Star Hair)
Asystasia (Coromandels)
Athyrium (lady ferns)
Athyrium angustum (northern lady fern)
Athyrium asplenioides (southern lady fern)
Athyrium filix-femina (lady fern)
Athyrium filix-femina 'Frizelliae' (Tatting Fern)
Athyrium filix-femina 'Victoriae' (Victoria Lady Fern)
Athyrium 'Ghost' (Ghost Fern)
Athyrium niponicum 'Pictum' (Japanese Painted Fern)
Athyrium otophorum (Eared Lady Fern)
Atractocarpus
Atractocarpus fitzalanii (Brown Gardenia)
Atrichum (Smoothcap Mosses)
Atrichum angustatum (lesser smoothcap)
Atrichum undulatum (Catherine's moss)
Atriplex (Saltbushes)
Atriplex canescens (Fourwing Saltbush)
Atriplex cinerea (Grey Saltbush)
Atriplex confertifolia (Shadscale Saltbush)
Atriplex halimus
Atriplex hymenelytra (Desert Holly)
Atriplex laciniata (Frosted Orache)
Atriplex lentiformis (big saltbush)
Atriplex littoralis (Grass-leaved Orache)
Atriplex patula (Common Orache)
Atriplex portulacoides (Sea-purslane)
Atriplex prostrata (Creeping Saltbush)
Atriplex semibaccata (berry saltbush)
Atropa
Atropa bella-donna (Deadly Nightshade)
Aubrieta
Aubrieta deltoidea (purple rock cress)
Aubrieta × 'Red Cascade' (Red Cascade Aubretia)
Aucuba
Aucuba japonica (Japanese aucuba)
Aucuba japonica 'Gold Dust' (Gold Dust aucuba)
Aucuba japonica 'Mr. Goldstrike' (Mr. Goldstrike Aucuba)
Aureolaria (yellow false foxgloves)
Aurinia
Aurinia saxatilis 'Summit' (Summit Basket of Gold)
Austromyrtus
Austromyrtus dulcis (Midgen Berry)
Austrosteenisia
Austrosteenisia blackii (Blood Vine)
Austrostipa
Austrostipa mollis (soft speargrass)
Avena (Oats)
Avena barbata (slender wild oat)
Avena fatua (wild oat)
Avena sativa (Common Oat)
Avenella
Avenella flexuosa (wavy hair-grass)
Averrhoa
Averrhoa carambola (Star Fruit Carambola)
Avicennia
Avicennia germinans (black mangrove)
Avicennia marina (Grey Mangrove)
Azadirachta
Azadirachta indica (Neem Tree)
Azara
Azara microphylla (Boxleaf azara)
Azolla (Mosquito Ferns)
Azolla pinnata (Feathered Mosquito Fern)
Azolla rubra (Red Azolla)
Babiana (Baboon Root)
Baccharis
Baccharis halimifolia (groundsel tree)
Baccharis neglecta (Poverty Weed)
Baccharis pilularis (Coyote Brush)
Baccharis salicifolia (mule fat)
Baccharis sarothroides (Desert Broom)
Backhousia
Backhousia myrtifolia (Grey Myrtle)
Bacopa
Bacopa monnieri (Herb-of-Grace)
Bahiopsis
Bahiopsis laciniata (Tornleaf Goldeneye)
Bahiopsis parishii (Parish's Goldeneye)
Baileya
Baileya multiradiata (Desert Marigold)
Balduina
Balduina angustifolia (coastal plain honeycombhead)
Ballota
Ballota nigra (Black Horehound)
Baloskion
Baloskion tetraphyllum (tassel cord-rush)
Balsamorhiza (balsamroots)
Balsamorhiza sagittata (arrowleaf balsamroot)
Bambusa
Banksia (Banksias)
Banksia aemula (Wallum banksia)
Banksia attenuata (Candlestick Banksia)
Banksia collina (Hill Banksia)
Banksia cunninghamii
Banksia dallanneyi (couch honeypot)
Banksia ericifolia (Heath-leaved banksia)
Banksia grandis (Giant Banksia)
Banksia hookeriana
Banksia integrifolia (Coastal Banksia)
Banksia marginata (Silver Banksia)
Banksia menziesii (Firewood Banksia)
Banksia oblongifolia (Rusty Banksia)
Banksia ornata (Desert Banksia)
Banksia robur (Swamp Banksia)
Banksia serrata (Old man banksia)
Banksia sessilis (Parrot Bush)
Banksia spinulosa (Hairpin Banksia)
Banksia spinulosa 'Birthday Candles'
Baptisia (wild indigos)
Baptisia alba var. macrophylla (Large-leaved White Wild Indigo)
Baptisia australis (Blue Wild Indigo)
Baptisia lactea (prairie false indigo)
Baptisia leucophaea (cream wild-indigo)
Baptisia 'Purple Smoke' (Purple Smoke Baptisia)
Baptisia tinctoria (eastern wild indigo)
Barbarea (wintercresses)
Barbarea orthoceras (American yellowrocket)
Barbarea vulgaris (bitter wintercress)
Barbula
Barbula calycina
Barbula unguiculata (Bird's-Claw Beard-Moss)
Barleria (Bushviolets)
Bassia
Bassia scoparia (summer-cypress)
Batis
Batis maritima (Saltwort)
Bauera
Bauera rubioides (River Rose)
Bauhinia (Orchid Trees)
Bauhinia blakeana (Hong Kong Orchid Tree)
Bazzania
Bazzania trilobata (greater whipwort)
Beaucarnea
Beaucarnea recurvata (Ponytail Palm)
Bebbia
Bebbia juncea (Sweetbush)
Bedfordia
Bedfordia arborescens (Blanket Leaf)
Bedfordia salicina (Blanket Bush)
Beesia
Beesia deltophylla (beesia)
Begonia (Begonias)
Begonia ferox (Begonia Ferox)
Begonia grandis ssp. (Hardy Begonia)
Begonia grandis ssp. evansiana (Hardy Begonia)
Begonia longiciliata (Begonia Longiciliata)
Begonia masoniana (Criss Cross Begonia)
Begonia × semperflorens-cultorum (wax begonia)
Begonia soli-mutata (Begonia Soli-Mutata)
Begonia × tuberhybrida (Tuberous Begonia)
Belamcanda
Belamcanda chinensis (Blackberry Lily)
Bellardia
Bellardia trixago (Mediterranean lineseed)
Bellardia viscosa (Yellow Glandweed)
Bellendena
Bellendena montana (Mountain Rocket)
Bellis
Bellis perennis (Lawn daisy)
Berberis (Barberries)
Berberis aquifolium (tall Oregon-grape)
Berberis bealei (leatherleaf mahonia)
Berberis buxifolia 'Nana' (Dwarf Magellan Barberry)
Berberis candidula (Paleleaf Barberry)
Berberis darwinii (Darwin's barberry)
Berberis gladwynensis 'William Penn' (William Penn Barberry)
Berberis × hortensis (Hybrid Mahonia)
Berberis japonica (Japanese Mahonia)
Berberis julianae (Wintergreen barberry)
Berberis nervosa (Oregon-grape)
Berberis repens (creeping mahonia)
Berberis thumbergii 'Orange Rocket' (Orange Rocket Barberry)
Berberis thunbergii (Japanese barberry)
Berberis thunbergii 'Aurea' (golden Japanese barberry)
Berberis thunbergii 'Crimson Pygmy' (Crimson Pygmy Barberry)
Berberis thunbergii f. atropurpurea (purpleleaf or redleaf Japanese barberry)
Berberis thunbergii f. atropurpurea 'Atropurpurea Nana' (Crimson Pygmy barberry)
Berberis thunbergii f. atropurpurea 'Helmond Pillar' (Helmond Pillar Japanese barberry)
Berberis thunbergii f. atropurpurea 'Rose Glow' (Rose Glow Japanese barberry)
Berberis thunbergii f. 'Bagatelle' (Bagatelle Barberry)
Berberis thunbergii f. 'Concorde' (Concorde Barberry)
Berberis thunbergii f. 'Golden Ring' (Golden Ring Barberry)
Berberis thunbergii f. 'Helmond Pillar' (Helmond Pillar Barberry)
Berberis thunbergii f. 'Rose Glow' (Rose Glow Barberry)
Berberis thunbergii 'Maria' (Sunjoy Golden Pillar Barberry)
Berberis trifoliolata (Agarita)
Berberis verruculosa (Warty barberry)
Berberis x gladwynensis (Gladwyne barberry)
Berberis x gladwynensis 'William Penn' (William Penn barberry)
Berchemia
Berchemia scandens (Supplejack)
Bergenia (elephant-ears)
Bergenia ciliata (Frilly Bergenia)
Bergenia crassifolia (Heartleaf bergenia)
Bergenia purpurascens
Bergenia spp. (bergenia)
Berkheya (African Thistles)
Berteroa
Berteroa incana (hoary alyssum)
Berula
Berula erecta (cutleaf water parsnip)
Betonica
Betonica officinalis (common hedge-nettle)
Betula (birches)
Betula alleghaniensis (Yellow Birch)
Betula lenta (sweet birch)
Betula nigra (River Birch)
Betula nigra 'Cully' (Heritage® river birch)
Betula papyrifera (paper birch)
Betula pendula (European white birch)
Betula pendula 'Dalecarlica' (cutleaf weeping birch)
Betula pendula 'Youngii' (Young's weeping birch)
Betula populifolia (gray birch)
Betula pubescens (Downy Birch)
Betula utilis ssp. jacquemontii (Himalayan white birch)
Betula utilis var. jacquemontii (White-barked Himalayan Birch)
Bidens (Beggarticks)
Bidens aristosa (Bearded Beggarticks)
Bidens bipinnata (Spanish needles)
Bidens cernua (Nodding Beggarticks)
Bidens frondosa (Devil's Beggarticks)
Bidens laevis (Smooth Beggarticks)
Bidens pilosa (Hairy Beggarticks)
Bigelowia
Bigelowia nuttallii (Nuttall's Rayless Goldenrod)
Bignonia
Bignonia capreolata 'Tangerine Beauty' (Tangerine Beauty Crossvine)
Billardiera
Billardiera cymosa (sweet apple-berry)
Billardiera fusiformis (Australian Bluebell)
Billardiera mutabilis (Common Apple-berry)
Billardiera scandens (Apple Berry)
Bismarckia
Bismarckia nobilis (Bismarck Palm)
Bistorta (bistorts)
Bistorta amplexicaulis (red bistort)
Bistorta bistortoides (American bistort)
Bistorta officinalis (common bistort)
Blackstonia
Blackstonia perfoliata (Yellow-wort)
Blandfordia
Blandfordia nobilis (Christmas Bells)
Blechnum (hard ferns)
Blechnum nudum (Fishbone water-fern)
Blechnum penna-marina (Alpine Water Fern)
Blechnum tabulare
Blechnum wattsii (Hard Water-fern)
Blephilia
Blephilia hirsuta (Hairy Wood Mint)
Bloomeria
Bloomeria crocea (goldenstar)
Boechera (rockcresses)
Boehmeria (false nettles and allies)
Boehmeria cylindrica (false nettle)
Boehmeria platanifolia
Boerhavia (Spiderlings)
Boerhavia coccinea (scarlet spiderling)
Bolboschoenus
Bolboschoenus maritimus (sea clubrush)
Bomarea
Borago
Borago officinalis (borage)
Borodinia
Borodinia laevigata (smooth rockcress)
Boronia
Boronia ledifolia (Sydney Boronia)
Boronia pinnata (Pink Boronia)
Boronia rosmarinifolia (Pink Boronia)
Boronia spathulata
Borrichia
Borrichia frutescens (sea ox-eye)
Bossiaea
Bossiaea cinerea (Showy Bossiaea)
Bossiaea heterophylla (Variable Bossiaea)
Bossiaea obcordata (Spiny Bossiaea)
Bossiaea prostrata (creeping bossiaea)
Bossiella
Bothriochloa (Bluestems)
Bothriochloa ischaemum (King Ranch bluestem)
Bothriochloa torreyana (silver bluestem)
Botrypus
Botrypus virginianus (rattlesnake fern)
Bougainvillea (bougainvilleas)
Bougainvillea × buttiana (garden bougainvillea)
Bougainvillea spectabilis (Bougainvillea)
Bouteloua (gramas)
Bouteloua curtipendula (Sideoats Grama)
Bouteloua dactyloides (Buffalo Grass)
Bouteloua gracilis (Blue Grama Grass)
Bowlesia
Bowlesia incana (hoary bowlesia)
Boykinia
Boykinia major (Boykinia)
Brachychiton (Kurrajongs)
Brachychiton acerifolius (flame tree)
Brachychiton populneus (kurrajong)
Brachychiton rupestris (Queensland Bottle Tree)
Brachyglottis Dunedin Hybrid 'Sunshine' (Sunshine Daisy Bush)
Brachyloma
Brachyloma daphnoides (Daphne heath)
Brachyloma ericoides (brush heath)
Brachypodium
Brachypodium sylvaticum (Slender False Brome)
Brachyscome
Brachyscome ciliaris (Variable Daisy)
Brachyscome multifida (cut-leaved daisy)
Brachyscome spathulata (Spoon Daisy)
Brachythecium
Brachythecium albicans (Whitish Feather-moss)
Brachythecium rutabulum (Rough-stalked Feather-moss)
Brasenia
Brasenia schreberi (Watershield)
Brassica (cabbages and mustards)
Brassica juncea 'Osaka Purple' (Osaka Purple Mustard Greens)
Brassica juncea 'Red Giant' (Red Giant Mustard Greens)
Brassica napus 'Dwarf Essex' (Dwarf Essex Rape (Turnip Greens))
Brassica napus 'Red Russian' (Red Russian Kale)
Brassica oleracea 'Calabrese' (Calabrese Broccoli)
Brassica oleracea 'Cheddar' (Cheddar Cauliflower)
Brassica oleracea 'Copenhagen Market' (Copenhagen Market Cabbage)
Brassica oleracea 'Diablo' (Diablo Brussels Sprouts)
Brassica oleracea 'Di Cicco' (Di Cicco Broccoli)
Brassica oleracea 'Early Jersey Wakefield' (Early Jersey Wakefield Cabbage)
Brassica oleracea 'Georgia Southern' (Georgia Southern Collard Greens)
Brassica oleracea 'Lacinato' (Lacinato Kale)
Brassica oleracea 'Long Island Improved' (Long Island Improved Brussels Sprouts)
Brassica oleracea 'Purple of Sicily' (Purple of Sicily Cauliflower)
Brassica oleracea 'Red Acre' (Red Acre Cabbage)
Brassica oleracea 'Redbor' (Redbor Kale)
Brassica oleracea 'Red Russian' (Red Russian Kale)
Brassica oleracea 'Snow Crown' (Snow Crown Cauliflower)
Brassica oleracea var. sabellica 'Vates' (Vates Kale)
Brassica oleracea 'Waltham 29' (Waltham 29 Broccoli)
Brassica oleracea 'Winterbor' (Winterbor Kale)
Brassica rapa 'Hakurei' (Hakurei Turnip)
Brassica rapa 'Scarlet Queen' (Scarlet Queen Turnip)
Brassica rapa 'Seven Top' (Seven Top Turnip Greens)
Brassica rapa 'Tokyo Bekana' (Tokyo Bekana Asian Greens)
Brassica tournefortii (Saharan Mustard)
Breutelia
Breutelia affinis (Red-heart Moss)
Breynia
Breynia oblongifolia (coffee bush)
Brickellia (brickellbushes)
Brickellia californica (California Brickellbush)
Brickellia eupatorioides (False Boneset)
Briza
Briza maxima (big quaking grass)
Briza media (Quaking-grass)
Briza minor (Little quaking-grass)
Brodiaea (Brodiaeas)
Brodiaea coronaria (Crown Brodiaea)
Brodiaea elegans (Harvest Brodiaea)
Bromelia
Bromus (bromes)
Bromus catharticus (Rescue Brome)
Bromus diandrus (great brome)
Bromus hordeaceus (common soft brome)
Bromus inermis (smooth brome)
Bromus japonicus (Japanese brome)
Bromus rubens (Red Brome)
Bromus sitchensis (Alaska brome)
Bromus sterilis (barren brome)
Bromus tectorum (cheat grass)
Broussonetia
Broussonetia papyrifera (Paper mulberry)
Brugmansia (angel's trumpets)
Brugmansia suaveolens (Angel's Trumpet)
Bruguiera
Bruguiera gymnorhiza (orange mangrove)
Brunfelsia (raintrees)
Brunfelsia pauciflora (Yesterday-Today-and-Tomorrow)
Brunnera
Brunnera macrophylla (perennial forget-me-not)
Brunnera macrophylla 'Dawson's White' (Dawson's White Brunnera)
Brunnera macrophylla 'Hadspen Cream' (Hadspen Cream Brunnera)
Brunnera macrophylla 'Jack Frost' (Jack Frost Heartleaf Brunnera)
Brunonia
Brunonia australis (blue pincushion)
Brunoniella
Brunoniella australis (Blue Trumpet)
Bryoandersonia
Bryoandersonia illecebra (spoon-leaved moss)
Bryonia
Bryonia cretica (White Bryony)
Bryum
Bryum argenteum (Silvery Bryum)
Buchnera
Buchnera floridana (Florida bluehearts)
Buddleja (butterfly bushes and allies)
Buddleja davidii (butterfly bush)
Buddleja davidii 'Black Knight' (Black Knight Butterfly Bush)
Buddleja davidii 'Pink Delight' (Pink Delight Butterfly Bush)
Buddleja globosa (globe butterfly bush)
Buglossoides
Buglossoides arvensis (corn gromwell)
Bulbine (Kopievas)
Bulbine bulbosa (Bulbine Lily)
Bunium
Bunium bulbocastanum
Buphthalmum
Buphthalmum salicifolium (Willowleaf Ox-eye)
Bupleurum
Bupleurum longifolium (Long-leaved Hare's Ear)
Bupleurum rotundifolium
Burchardia
Burchardia congesta (Milkmaids)
Burchardia umbellata (Milkmaids)
Bursaria
Bursaria spinosa (Australian Blackthorn)
Bursera
Bursera simaruba (Gumbo Limbo)
Butia
Butia capitata (Pindo Palm)
Butia odorata (Jelly Palm)
Butomus
Butomus umbellatus (flowering rush)
Buxus (boxes)
Buxus × 'Green Velvet' (Green Velvet Boxwood)
Buxus microphylla 'Green Gem' (Green Gem Boxwood)
Buxus microphylla 'Winter Gem' (Winter Gem Boxwood)
Buxus sempervirens (English Boxwood)
Buxus sempervirens 'Aureovariegata' (Golden Variegated Boxwood)
Buxus sempervirens 'Green Mountain' (Green Mountain Boxwood)
Buxus sempervirens 'Suffruticosa' (Dwarf English Boxwood)
Byrsonima (byrsonima)
Caesalpinia
Caesalpinia pulcherrima (peacock flower)
Caesia
Caesia calliantha (blue grass lily)
Caesia parviflora (Pale Grass Lily)
Cakile (Searockets)
Cakile edentula (American searocket)
Cakile maritima (European Searocket)
Caladenia
Caladenia cardiochila (thick-lipped spider-orchid)
Caladenia carnea (Pink Lady Fingers)
Caladenia catenata (Lady Fingers)
Caladenia flava (Cowslip Orchid)
Caladenia fuscata (Dusky Fingers)
Caladenia latifolia (Pink Fairies)
Caladenia longicauda (White Spider Orchid)
Caladenia moschata (Musky Caps)
Caladenia parva (Small Spider-orchid)
Caladenia picta (Painted Fingers)
Caladenia tentaculata (eastern mantis orchid)
Caladenia transitoria (Eastern Bronzehood Orchid)
Caladium (Caladium)
Caladium bicolor (Caladium)
Calamagrostis (Reedgrasses)
Calamagrostis × acutiflora 'Overdam' (Overdam Feather Reed Grass)
Calamagrostis arenaria (European marram grass)
Calamagrostis brachytricha (Korean Feather Reed Grass)
Calamagrostis breviligulata (American marram grass)
Calamagrostis canadensis (bluejoint)
Calamagrostis × 'Cheju-Do' (Cheju-Do Reed Grass)
Calamagrostis epigejos (Bushgrass)
Calamintha
Calamintha nepeta ssp. nepeta (calamint)
Calamus
Calamus muelleri (Wait-a-while)
Calandrinia
Calandrinia menziesii (redmaids)
Calanthe
Calanthe triplicata (Christmas Orchid)
Calasterella
Calasterella californica (California asterella)
Calathea
Calathea lancifolia (Rattlesnake Plant)
Calathea roseopicta (Calathea Medallion)
Calceolaria (Slipper flowers)
Caleana
Caleana major (Large Flying Duck Orchid)
Calendula (marigolds)
Calla
Calla palustris (marsh calla)
Calliandra (stickpeas)
Calliandra eriophylla (pink fairy-duster)
Calliandra haematocephala (Pink Powder Puff)
Callianthe
Callicarpa (Beautyberries)
Callicarpa americana (American Beautyberry)
Callicarpa bodinieri (beautyberry)
Callicarpa bodinieri var. 'Profusion' (Profusion Beautyberry)
Callicarpa dichotoma (Purple Beautyberry)
Callicladium
Callicladium imponens (brocade moss)
Callicoma
Callicoma serratifolia (Callicoma)
Calliergonella
Calliergonella cuspidata (Pointed Spear-moss)
Callirhoe (poppymallows)
Callirhoe involucrata (winecup mallow)
Callisia
Callisia repens (Turtle Vine)
Callistemon
Callistemon citrinus (Red Cluster Bottlebrush)
Callistemon viminalis 'Hannah Ray' (Hannah Ray Bottlebrush)
Callistemon viminalis 'Little John' (Little John Dwarf Bottlebrush)
Callitriche (Water Starworts)
Callitriche stagnalis (Pond water-starwort)
Callitris
Callitris glaucophylla (White Cypress-pine)
Callitris gracilis (Slender Cypress-pine)
Callitris rhomboidea (Oyster Bay cypress-pine)
Callitropsis
Callitropsis nootkatensis (Alaska Cedar)
Callitropsis nootkatensis 'Pendula' (weeping Alaska yellow cedar)
Calluna
Calluna vulgaris (Scotch Heather)
Calluna vulgaris 'Firefly' (Firefly Heather)
Calluna vulgaris 'Spring Torch' (Spring Torch Heather)
Calocedrus
Calocedrus decurrens (incense cedar)
Calochilus
Calochilus campestris (copper beard orchid)
Calochilus paludosus (red beard orchid)
Calochilus robertsonii (Purple Beard Orchid)
Calochlaena
Calochlaena dubia (Common Ground Fern)
Calochortus (mariposa lilies)
Calochortus albus (White Globe Lily)
Calochortus amabilis (Diogenes' lantern)
Calochortus gunnisonii (Gunnison's Mariposa Lily)
Calochortus leichtlinii (Leichtlin's Mariposa Lily)
Calochortus luteus (Yellow Mariposa Lily)
Calochortus nuttallii (Sego Lily)
Calochortus splendens (Splendid Mariposa Lily)
Calochortus tolmiei (Tolmie's pussy ears)
Calochortus venustus (Butterfly Mariposa Lily)
Calopogon
Calopogon tuberosus (Tuberous Grasspink)
Calotis
Calotis cuneifolia (Purple Burr-daisy)
Calotis lappulacea (Bur Daisy)
Caltha
Caltha palustris (marsh marigold)
Calycanthus
Calycanthus floridus (Carolina sweetshrub)
Calycanthus occidentalis (Western Spice Bush)
Calycanthus × raulstonii (Raulston's allspice)
Calyptocarpus
Calyptocarpus vialis (straggler daisy)
Calyptridium (pussypaws)
Calyptridium monospermum (One-seeded Pussypaws)
Calystegia (false bindweeds)
Calystegia × lucana (Hybrid Bindweed)
Calystegia macrostegia (coast morning glory)
Calystegia purpurata (Pacific False Bindweed)
Calystegia sepium (hedge bindweed)
Calystegia silvatica (large bindweed)
Calystegia soldanella (Sea Bindweed)
Calytrix
Calytrix tetragona (Fringe Myrtle)
Camassia (camas)
Camassia cusickii (Cusick's Camas)
Camassia leichtlinii (Great Camas)
Camassia leichtlinii subsp. suksdorfii
Camassia quamash (common camas)
Camassia scilloides (Atlantic camas)
Camellia (Camellias)
Camellia japonica (Japanese camellia)
Camellia japonica 'Silver Waves' (Silver Waves Camellia)
Camellia sasanqua (sasanqua camellia)
Camellia sasanqua 'Setsugekka' (Setsugekka Camellia)
Camellia sinensis (Tea Plant)
Camellia vernalis 'Yuletide' (Yuletide Camellia)
Camellia williamsii 'Donation' (Donation Camellia)
Camissoniopsis (Suncups)
Camissoniopsis bistorta (California sun cup)
Camissoniopsis cheiranthifolia (beach suncup)
Campanula (bellflowers)
Campanula 'Birch Hybrid' (Birch Hybrid Bellflower)
Campanula carpatica (bellflower)
Campanula garganica 'Dickson's Gold' (Dickson's Gold Bellflower)
Campanula intercedens (intermediate bellflower)
Campanula lactiflora (Milky Bellflower)
Campanula latifolia (Giant Bellflower)
Campanula patula (Spreading Bellflower)
Campanula petiolata (western harebell)
Campanula portenschlagiana (Dalmatian Bellflower)
Campanula poscharskyana (Serbian Bellflower)
Campanula poscharskyana 'Blue Waterfall' (Blue Waterfall Bellflower)
Campanula rapunculoides (Creeping Bellflower)
Campanula rotundifolia (Harebell)
Campanula spp. (bellflowers)
Campanulastrum
Campanulastrum americanum (tall bellflower)
Campanula trachelium (Nettle-leaved Bellflower)
Camphora
Camphora officinarum (Camphor)
Campsis (trumpet vines)
Campsis × tagliabueana (Hybrid Trumpet Vine)
Campylopus
Campylopus introflexus (Heath Star-moss)
Canadanthus
Canadanthus modestus (Giant Mountain Aster)
Cananga
Cananga odorata (Ylang-Ylang)
Canavalia
Canavalia rosea (Beach Bean)
Canna (Canna Lilies)
Canna glauca (Water Canna)
Canna × hybrida (Garden Canna)
Capnoides
Capnoides sempervirens (rock harlequin)
Capparis (Caperbushes)
Capparis arborea (Brush Caper Berry)
Capsella (Shepherd's-purses)
Capsella bursa-pastoris (shepherd's purse)
Capsicum (peppers)
Capsicum annuum 'Anaheim' (Anaheim Pepper)
Capsicum annuum 'California Wonder' (California Wonder Bell Pepper)
Capsicum annuum 'Cayenne' (Cayenne Pepper)
Capsicum annuum 'Jalapeño' (Jalapeño Pepper)
Capsicum annuum 'Poblano' (Poblano Pepper)
Capsicum annuum 'Shishito' (Shishito Pepper)
Capsicum annuum 'Shishito' (Shishito Pepper)
Capsicum annuum 'Sweet Banana' (Sweet Banana Pepper)
Capsicum annuum 'Sweet Banana' (Sweet Banana Pepper)
Capsicum chinense 'Carolina Reaper' (Carolina Reaper)
Capsicum chinense 'Habanero' (Habanero Pepper)
Cardamine (Bittercresses and Toothworts)
Cardamine amara (large bittercress)
Cardamine bulbosa (bulbous cress)
Cardamine californica (milkmaids)
Cardamine concatenata (cut-leaved toothwort)
Cardamine diphylla (Two-leaved Toothwort)
Cardamine douglassii (Purple Cress)
Cardamine flexuosa (wavy bittercress)
Cardamine hirsuta (shotweed)
Cardamine impatiens (narrow-leaved bittercress)
Cardamine maxima (Large Toothwort)
Cardamine nuttallii (Nuttall's toothwort)
Cardamine pensylvanica (Pennsylvania Bittercress)
Cardamine pratensis (Cuckooflower)
Cardamine trifolia (toothwort)
Cardiocrinum
Cardiocrinum giganteum (giant Himalayan lily)
Cardiospermum
Cardiospermum grandiflorum (Showy Balloon Vine)
Cardiospermum halicacabum (Lesser Balloon Vine)
Carduus (plumeless thistles)
Carduus crispus (Welted Thistle)
Carduus nutans (musk thistle)
Carduus pycnocephalus (Italian thistle)
Carduus tenuiflorus (slenderflower thistle)
Carex (true sedges)
Carex acutiformis (lesser pond sedge)
Carex albicans (White-Tinged Sedge)
Carex amphibola (Creek Sedge)
Carex amplifolia (Bigleaf Sedge)
Carex appalachica (Appalachian Sedge)
Carex appressa (Southern Cutty Sedge)
Carex aquatilis (Sitka Aquatic Sedge)
Carex arenaria (sand sedge)
Carex bicknellii (Bicknell's Sedge)
Carex blanda (eastern woodland sedge)
Carex brevior (Plains Oval Sedge)
Carex bromoides (Brome-Like Sedge)
Carex buchananii (Leatherleaf Sedge)
Carex caryophyllea (spring sedge)
Carex cherokeensis (Cherokee Sedge)
Carex comans (Hair Sedge)
Carex comosa (Longhair Sedge)
Carex crinita (Fringed Sedge)
Carex declinata (Drooping Sedge)
Carex decomposita (Cypress-Knee Sedge)
Carex densa (Dense Sedge)
Carex deweyana (Dewey's Sedge)
Carex divulsa (Berkeley Sedge)
Carex eburnea (Ivory Sedge)
Carex elata 'Aurea' (Bowles' Golden Sedge)
Carex elongata (elongated sedge)
Carex firma (firm sedge)
Carex flacca (Blue Sedge)
Carex flaccosperma (Blue Wood Sedge)
Carex frankii (Frank's Sedge)
Carex grayi (Gray's Sedge)
Carex hirta (hairy sedge)
Carex 'Ice Dance' (Ice Dance Sedge)
Carex intumescens (bladder sedge)
Carex leavenworthii (Leavenworth's Sedge)
Carex lupulina (hop sedge)
Carex lurida (sallow sedge)
Carex lyngbyei (Lyngby's sedge)
Carex mertensii (Merten's Sedge)
Carex morrowii 'Silver Sceptre' (Silver Sceptre Japanese Sedge)
Carex morrowii 'Variegata' (Japanese Sedge)
Carex muskingumensis (Palm Sedge)
Carex muskingumensis 'Ice Fountains' (Ice Fountains Palm Sedge)
Carex nigra (smooth black sedge)
Carex obnupta (slough sedge)
Carex ornithopoda 'Aurea' (Golden Bird's Foot Sedge)
Carex ornithopoda 'Variegata' (Variegated Bird's Foot Sedge)
Carex oshimensis 'Evergold' (Evergold Japanese Sedge)
Carex otrubae (False Fox-sedge)
Carex pallescens (pale sedge)
Carex panicea (grass-like sedge)
Carex pendula (Hanging sedge)
Carex pensylvanica (Pennsylvania Sedge)
Carex pensylvanica
Carex plantaginea (Plantain-Leaved Sedge)
Carex praegracilis (Clustered Field Sedge)
Carex radiata (Eastern Star Sedge)
Carex remota (Remote Sedge)
Carex riparia (greater pond sedge)
Carex scaposa (Pink-Flowered Sedge)
Carex 'Silver Sceptre' (Silver Sceptre Sedge)
Carex sprengelii (Sprengel's Sedge)
Carex squarrosa (Squarrose Sedge)
Carex stipata (sawbeak sedge)
Carex stricta (Tussock Sedge)
Carex sylvatica (European Woodland Sedge)
Carex testacea (orange New Zealand sedge)
Carex testacea 'Prairie Fire' (Prairie Fire Sedge)
Carex texensis (Texas Sedge)
Carex umbrosa (shade sedge)
Carex vulpina (fox sedge)
Carex vulpinoidea (Fox Sedge)
Carex woodii (Wood's Sedge)
Carica (Papaya)
Carica papaya (Papaya)
Carissa (Num-nums)
Carissa macrocarpa (Natal Plum)
Carissa ovata (conkerberry)
Carlina (Carline Thistles)
Carlina vulgaris (Carline Thistle)
Carnegiea
Carnegiea gigantea (saguaro)
Carphephorus
Carphephorus corymbosus (coastalplain chaffhead)
Carpinus (hornbeams)
Carpinus betulus (European Hornbeam)
Carpinus betulus 'Fastigiata' (narrow European hornbeam)
Carpinus caroliniana (American Hornbeam)
Carpinus cordata (Heartleaf Hornbeam)
Carpinus japonica (Japanese Hornbeam)
Carpobrotus (sea figs)
Carpobrotus chilensis (Chilean sea fig)
Carpobrotus edulis (sea fig)
Carpobrotus glaucescens (Angular Sea-fig)
Carpobrotus rossii (Australian Pig Face)
Carya (hickories)
Carya cordiformis (bitternut hickory)
Carya glabra (pignut hickory)
Carya illinoinensis (pecan)
Carya ovata (shagbark hickory)
Carya tomentosa (mockernut)
Caryota (Fishtail palms)
Cascabela
Cassia
Cassia × nealiae (rainbow shower tree)
Cassinia
Cassinia aculeata (Australian Tauhinu)
Cassinia longifolia (Shiny Cassinia)
Cassinia sifton (Sifton Bush)
Cassytha
Cassytha filiformis (laurel dodder)
Cassytha glabella (Slender Devil's Twine)
Cassytha melantha (Coarse Dodder-laurel)
Cassytha pubescens (Downy Dodder-laurel)
Castanea dentata (American chestnut)
Castanea mollissima (Chinese Chestnut)
Castanea sativa (Sweet Chestnut)
Castanopsis
Castanopsis cuspidata (Japanese Chinquapin)
Castanospermum
Castanospermum australe (Blackbean)
Castilleja (Paintbrushes)
Castilleja affinis (Coast Paintbrush)
Castilleja applegatei (wavyleaf paintbrush)
Castilleja chromosa (Desert Paintbrush)
Castilleja coccinea (Painted-cup paintbrush)
Castilleja exserta (purple owl's-clover)
Castilleja foliolosa (woolly paintbrush)
Castilleja hispida (harsh paintbrush)
Castilleja indivisa (Texas Paintbrush)
Castilleja integra (Wholeleaf Paintbrush)
Castilleja linariifolia (Wyoming Paintbrush)
Castilleja miniata (Common Paintbrush)
Castilleja rhexiifolia (Rhexia-leaved paintbrush)
Casuarina (she-oaks)
Casuarina cunninghamiana (River sheoak)
Casuarina equisetifolia (Beach Sheoak)
Casuarina glauca (Swamp sheoak)
Catalpa (Catalpas)
Catalpa bignonioides 'Aurea' (Golden Indian Bean Tree)
Catalpa bignonioides 'Nana' (Umbrella Catalpa)
Catalpa speciosa (Northern Catalpa)
Catalpa spp. (catalpa)
Catapodium
Catapodium rigidum (Fern-grass)
Catharanthus (Periwinkle)
Catharanthus roseus (Vinca / Periwinkle)
Cattleya
Caulerpa
Caulophyllum (blue cohoshes)
Caulophyllum giganteum (early blue cohosh)
Caulophyllum thalictroides (Blue Cohosh)
Causonis
Causonis clematidea (Slender Grape)
Caustis
Caustis flexuosa (Curly Wig)
Cavendishia
Ceanothus (Ceanothus)
Ceanothus americanus (New Jersey tea)
Ceanothus cordulatus (mountain whitethorn)
Ceanothus cuneatus (Buckbrush)
Ceanothus gloriosus (Point Reyes ceanothus)
Ceanothus gloriosus var. porrectus (ceanothus-gloriosus-var-porrectus)
Ceanothus integerrimus (deerbrush ceanothus)
Ceanothus leucodermis (chaparral whitethorn)
Ceanothus prostratus (Mahala mat)
Ceanothus thyrsiflorus (Blue Blossom)
Ceanothus velutinus (Snowbrush)
Ceanothus 'Victoria' (Victoria ceanothus)
Cecropia (Cecropias)
Cedrus (Cedars)
Cedrus atlantica (Atlas Cedar)
Cedrus atlantica 'Glauca' (blue Atlas cedar)
Cedrus atlantica 'Glauca Fastigiata' (narrow blue Atlas cedar)
Cedrus atlantica 'Glauca Pendula' (weeping blue Atlas cedar)
Cedrus deodara (deodar cedar)
Cedrus libani (cedar of Lebanon)
Ceiba
Ceiba speciosa (Pink Silk Floss Tree)
Celastrus (bittersweets)
Celastrus orbiculatus (Asian bittersweet)
Celastrus scandens (American bittersweet)
Celosia (Cockscombs)
Celosia argentea (Cockscomb)
Celtis (hackberries)
Celtis laevigata (sugar hackberry)
Celtis occidentalis (common hackberry)
Celtis pallida (spiny hackberry)
Celtis reticulata (netleaf hackberry)
Celtis sinensis (Chinese Hackberry)
Cenchrus (sandburs and fountain grasses)
Cenchrus ciliaris (buffelgrass)
Cenchrus clandestinus (Kikuyu Grass)
Cenchrus × cupreus (purple fountain grass)
Cenchrus setaceus (Fountain Grass)
Cenchrus spinifex (coastal sandbur)
Cenolophium
Cenolophium denudatum
Centaurea (knapweeds)
Centaurea cyanus (Cornflower)
Centaurea debeauxii (Chalk Knapweed)
Centaurea diffusa (diffuse knapweed)
Centaurea jacea (Brown Knapweed)
Centaurea melitensis (Maltese star-thistle)
Centaurea × moncktonii (Monckton's Knapweed)
Centaurea montana (Perennial Cornflower)
Centaurea nigra (black knapweed)
Centaurea nigrescens (meadow knapweed)
Centaurea scabiosa (Greater Knapweed)
Centaurea solstitialis (Yellow Star-Thistle)
Centaurea stoebe (spotted knapweed)
Centaurium (Centauries)
Centaurium erythraea (Common centaury)
Centaurium pulchellum (Lesser Centaury)
Centaurium tenuiflorum (Slender Centaury)
Centella (Pennywort)
Centella asiatica (Indian pennywort)
Centranthus (Valerian)
Centranthus ruber (Red Valerian)
Centropogon
Centrosema (Butterfly Peas)
Centrosema virginianum (butterfly pea)
Cephalanthera
Cephalanthera damasonium (white helleborine)
Cephalanthus
Cephalanthus occidentalis (Buttonbush)
Cephalaria
Cephalaria gigantea (Giant Scabious)
Cephalocereus
Cephalocereus senilis (Old Man Cactus)
Cephalotaxus
Cephalotaxus fortunei (Chinese Plum Yew)
Cephalotaxus harringtonia (Japanese Plum Yew)
Cephalotaxus harringtonia (Japanese Plum Yew)
Ceramium (Banded Weeds)
Cerastium (Mouse-ear Chickweeds)
Cerastium arvense (field chickweed)
Cerastium fontanum subsp. vulgare (mouse-ear chickweed)
Cerastium glomeratum (Sticky mouse-ear chickweed)
Ceratiola
Ceratiola ericoides (Florida rosemary)
Ceratocapnos
Ceratocapnos claviculata (Climbing Corydalis)
Ceratodon
Ceratodon purpureus (Redshank)
Ceratopetalum
Ceratopetalum apetalum (coachwood)
Ceratopetalum gummiferum (New South Wales christmas bush)
Ceratophyllum
Ceratophyllum demersum (coontail)
Ceratostigma
Ceratostigma plumbaginoides (Leadwort)
Ceratostigma willmottianum (Chinese Plumbago)
Cercidiphyllum
Cercidiphyllum japonicum (katsura)
Cercidiphyllum japonicum 'Pendulum' (weeping katsura)
Cercis (redbuds)
Cercis canadensis (redbud)
Cercis canadensis 'Covey' (Lavender Twist Weeping Redbud Tree)
Cercis canadensis 'Forest Pansy' (Forest Pansy redbud)
Cercis chinensis 'Avondale' (Avondale Chinese Redbud)
Cercis occidentalis (Western Redbud)
Cercis racemosa (Chain-flowered Redbud)
Cercis siliquastrum (Judas-tree)
Cercocarpus (mountain mahoganies)
Cercocarpus betuloides (Birchleaf Mountain Mahogany)
Cercocarpus ledifolius (Mountain Mahogany)
Cercocarpus montanus (Alderleaf Mountain Mahogany)
Cereus
Ceropegia
Ceropegia woodii (String of Hearts)
Cestrum (cestrums)
Chaenactis (pincushion plants)
Chaenactis douglasii (Hoary Pincushion)
Chaenactis fremontii (Fremont's pincushion)
Chaenactis glabriuscula (Common Yellow Chaenactis)
Chaenomeles (Flowering quinces)
Chaenomeles speciosa (flowering quince)
Chaenostoma (Skunkbushes)
Chaerophyllum
Chaerophyllum tainturieri (Tainturier's chervil)
Chaerophyllum temulum (Rough chervil)
Chaetopappa
Chaetopappa ericoides (Rose Heath)
Chamaebatia
Chamaebatia foliolosa (Mountain Misery)
Chamaecrista (sensitive and partridge peas)
Chamaecrista fasciculata (partridge pea)
Chamaecrista nictitans (sensitive pea)
Chamaecyparis (False Cypress)
Chamaecyparis lawsoniana (Lawson Cypress)
Chamaecyparis lawsoniana 'Glauca' (Blue Lawson Cypress)
Chamaecyparis obtusa (Hinoki Cypress)
Chamaecyparis obtusa 'Filicoides' (Fernspray Hinoki Cypress)
Chamaecyparis obtusa 'Gracilis' (Slender Hinoki Cypress)
Chamaecyparis obtusa 'Kosteri' (Koster's Hinoki Cypress)
Chamaecyparis obtusa 'Nana' (Dwarf Hinoki Cypress)
Chamaecyparis obtusa 'Nana Gracilis' (Dwarf Hinoki Cypress)
Chamaecyparis pisifera (Sawara Cypress)
Chamaecyparis pisifera 'Filifera' (Thread Cypress)
Chamaecyparis pisifera 'Filifera Aurea' (Golden Thread Cypress)
Chamaecyparis pisifera 'Filifera Aurea Nana' (Dwarf Golden Thread Cypress)
Chamaecyparis pisifera 'Golden Mop' (Golden Mop Cypress)
Chamaecyparis pisifera 'Sungold' (Sungold Falsecypress)
Chamaedaphne
Chamaedaphne calyculata (leatherleaf)
Chamaedorea
Chamaedorea cataractarum (Cat Palm)
Chamaedorea elegans (Parlor Palm)
Chamaedorea seifrizii (Bamboo Palm)
Chamaenerion
Chamaenerion angustifolium (Fireweed)
Chamaerops
Chamaerops humilis (European Fan Palm)
Chamaescilla
Chamaescilla corymbosa (Blue Stars)
Chamerion
Chamerion angustifolium (fireweed)
Chara (muskgrass)
Chasmanthium
Chasmanthium latifolium (Northern Sea Oats)
Chasmanthium laxum (Slender Woodoats)
Cheilanthes (Lip Ferns)
Cheilanthes austrotenuifolia (Rock Fern)
Cheilanthes lanosa
Cheilanthes sieberi (cloak fern)
Chelidonium
Chelidonium diphyllum (Celandine Poppy)
Chelidonium majus (Greater celandine)
Chelone
Chelone glabra (White Turtlehead)
Chelone lyonii (pink turtlehead)
Chelone obliqua (Rose Turtlehead)
Chelonopsis
Chelonopsis yagiharana (Yagihara Chelonopsis)
Chenopodiastrum (maple and nettle-leaved goosefoots)
Chenopodiastrum murale (nettle-leaved goosefoot)
Chenopodium (Goosefoots)
Chenopodium album (lambsquarters)
Chenopodium nutans (Climbing saltbush)
Chenopodium parabolicum (Fragrant Saltbush)
Chenopodium robertianum (Saloop)
Chiloglottis
Chiloglottis valida (large bird-orchid)
Chilopsis
Chilopsis linearis (desert willow)
Chimaphila
Chimaphila maculata (striped wintergreen)
Chimaphila umbellata (pipsissewa)
Chimonanthus
Chimonanthus praecox (Wintersweet)
Chionanthus (fringetrees and allies)
Chionanthus retusus (Chinese Fringetree)
Chionanthus virginicus (White Fringetree)
Chionochloa
Chionochloa rubra (Red Tussock Grass)
Chionodoxa
Chionodoxa luciliae (Glory of the Snow)
Chloranthus
Chloranthus fortunei
Chloris (windmill grasses)
Chloris gayana (Rhodes Grass)
Chloris × subdolichostachya (shortspike windmill grass)
Chloris truncata (black windmill grass)
Chlorogalum
Chlorogalum pomeridianum (wavy-leafed soap plant)
Chlorophytum (Grass Lilies)
Chlorophytum comosum (Spider Plant)
Choisya
Choisya 'Aztec Pearl' (Mexican Orange Blossom)
Choisya ternata (Mexican Orange Blossom)
Choisya ternata 'Sundance' (Golden Mexican Orange Blossom)
Chondrus
Chondrus crispus (Irish Moss)
Chorispora
Chorispora tenella (crossflower)
Chorizanthe
Chorizanthe rigida (Devil's Spineflower)
Christella
Christella dentata (Soft Fern)
Chromolaena
Chromolaena odorata (Siam weed)
Chrozophora
Chrozophora tinctoria (dyer's croton)
Chrysanthemum (chrysanthemums)
Chrysanthemum × morifolium (Garden Mum)
Chrysanthemum spp. (Mammoth Mums Collection)
Chrysobalanus
Chrysobalanus icaco (Cocoplum)
Chrysocephalum
Chrysocephalum baxteri (Fringed Everlasting)
Chrysocephalum semipapposum (clustered everlasting)
Chrysogonum
Chrysogonum virginianum (northern green-and-gold)
Chrysolepis
Chrysolepis chrysophylla (Golden Chinquapin)
Chrysolepis sempervirens (bush chinquapin)
Chrysopsis
Chrysopsis mariana (Maryland golden-aster)
Chrysosplenium
Chrysosplenium oppositifolium (Opposite-leaved Golden-saxifrage)
Chrysothamnus
Chrysothamnus viscidiflorus (Yellow Rabbitbrush)
Chusquea
Chusquea culeou (Chilean Bamboo)
Chylismia
Chylismia brevipes (Golden Suncup)
Chylismia claviformis (Browneyes)
Cicerbita
Cicerbita macrophylla (Common Blue-sow-thistle)
Cichorium (chicories and endives)
Cichorium intybus (chicory)
Cicuta
Cicuta maculata (water hemlock)
Cimicifuga racemosa (black bugbane)
Cinnamomum
Cinnamomum verum (True Cinnamon)
Circaea (enchanter's nightshades)
Circaea alpina (Alpine Enchanter's-nightshade)
Circaea canadensis (broadleaf enchanter's nightshade)
Circaea lutetiana (enchanter's-nightshade)
Cirsium (Plume Thistles)
Cirsium acaulon (Stemless Thistle)
Cirsium altissimum (Tall Thistle)
Cirsium arvense (Canada thistle)
Cirsium discolor (field thistle)
Cirsium heterophyllum (Melancholy Thistle)
Cirsium horridulum (bristle thistle)
Cirsium neomexicanum (New Mexico thistle)
Cirsium occidentale (Cobwebby Thistle)
Cirsium palustre (Marsh Thistle)
Cirsium rivulare
Cirsium texanum (Texas Thistle)
Cirsium undulatum (wavyleaf thistle)
Cirsium vulgare (bull thistle)
Cissus (Treebine)
Cissus trifoliata (sorrelvine)
Cistanthe (pussy paws)
Cistus (Shrubby Rock-roses)
Cistus albidus (white-leaved cistus)
Cistus creticus
Cistus × incanus (Magenta Rockrose)
Cistus ladanifer (Gum Rockrose)
Cistus laurifolius (laurel-leaved cistus)
Cistus purpureus (Purple Rock Rose)
Cistus x hybridus (White Rockrose)
Cistus x purpureus (Orchid Rockrose)
Cistus x skanbergii
Citrullus
Citrullus lanatus 'Sugar Baby' (Sugar Baby Watermelon)
Citrus (citrus)
Citrus × aurantium (Orange)
Citrus australasica (Finger Lime)
Citrus × floridana (Limequat)
Citrus limon 'Ponderosa' (Ponderosa Lemon)
Citrus × meyeri (Meyer Lemon)
Citrus × microcarpa (Calamansi)
Citrus reticulata 'Dancy' (Dancy Tangerine)
Citrus trifoliata (trifoliate orange)
Citrus unshiu 'Owari' (Owari Satsuma Mandarin)
Cladophora
Cladrastis
Cladrastis kentukea (American Yellowwood)
Claoxylon
Claoxylon australe (Brittlewood)
Clarkia (Clarkias)
Clarkia amoena (Farewell-To-Spring)
Clarkia purpurea (Winecup Clarkia)
Clarkia rhomboidea (diamond clarkia)
Clarkia rubicunda (ruby chalice clarkia)
Clarkia unguiculata (Elegant Clarkia)
Claytonia (spring beauties)
Claytonia caroliniana (Carolina Springbeauty)
Claytonia lanceolata (Lanceleaf Springbeauty)
Claytonia parviflora (Streambank Springbeauty)
Claytonia perfoliata (Miner's Lettuce)
Claytonia rubra (Redstem Springbeauty)
Claytonia sibirica (Siberian miner's-lettuce)
Claytonia virginica (Virginia Springbeauty)
Clematicissus
Clematicissus opaca (Pepper Vine)
Clematis (Clematis and leatherflowers)
Clematis 'Alionushka' (Alionushka Clematis)
Clematis × 'Arabella' (Arabella Clematis)
Clematis aristata (Australian Clematis)
Clematis armandii (Armand Clematis)
Clematis × 'Asao' (Asao Clematis)
Clematis 'Betty Corning' (Betty Corning Clematis)
Clematis cirrhosa (early clematis)
Clematis 'Constance' (Constance Clematis)
Clematis × 'Dr. Ruppel' (Dr. Ruppel Clematis)
Clematis drummondii (Old Man's Beard Clematis)
Clematis 'Duchess of Albany' (Duchess of Albany Clematis)
Clematis 'Duchess of Edinburgh' (Duchess of Edinburgh Clematis)
Clematis durandii (Durand's Clematis)
Clematis 'Etoile Violette' (Etoile Violette Clematis)
Clematis glycinoides (Headache Vine)
Clematis × 'Henryi' (Henryi Clematis)
Clematis 'Jackmanii' (Jackman Clematis)
Clematis lasiantha (Pipestem Clematis)
Clematis ligusticifolia (Western White Clematis)
Clematis 'Madame Julia Correvon' (Madame Julia Correvon)
Clematis microphylla (Small-leaved Clematis)
Clematis montana var. 'Tetrarose' (Tetrarose Clematis)
Clematis × 'Niobe' (Niobe Clematis)
Clematis patens (spreading clematis)
Clematis × 'Pink Champagne' (Pink Champagne Clematis)
Clematis pitcheri (Pitcher's leatherflower)
Clematis 'Polish Spirit' (Polish Spirit Clematis)
Clematis pubescens (Common Clematis)
Clematis × 'Rebecca' (Rebecca Clematis)
Clematis × 'Sapphire Indigo' (Sapphire Indigo Clematis)
Clematis spp. (clematis)
Clematis terniflora (Sweet Autumn Clematis)
Clematis virginiana (virgin's-bower)
Clematis vitalba (travelers-joy)
Cleome (Spider Flowers)
Cleome hassleriana (Spider Flower)
Cleome houtteana (Spider flower)
Cleomella
Cleomella arborea (Bladderpod)
Cleomella serrulata (Rocky Mountain Beeplant)
Clerodendrum (Glorybowers)
Clerodendrum floribundum (Lolly Bush)
Clerodendrum × speciosum (Red Bleeding Heart Vine)
Clerodendrum tomentosum (Downy Chance)
Clerodendrum trichotomum (harlequin glorybower)
Clethra
Clethra alnifolia (summersweet, sweet pepperbush)
Clethra alnifolia 'Hummingbird' (Hummingbird Summersweet)
Cliffortia (Caperoses)
Climacium (Climacium Mosses)
Climacium americanum (American Tree Moss)
Clinopodium (Calamints)
Clinopodium douglasii (Yerba Buena)
Clinopodium vulgare (Wild Basil)
Clintonia
Clintonia andrewsiana (Andrews' Clintonia)
Clintonia borealis (bluebead lily)
Clintonia uniflora (bead lily)
Clitoria
Clitoria mariana (Pigeonwings)
Clivia (Bush Lilies)
Clusia (attorney trees)
Clusia rosea (Autograph Tree)
Cnidoscolus
Cnidoscolus stimulosus (spurge nettle)
Cnidoscolus texanus (Texas Bull Nettle)
Coccoloba
Coccoloba uvifera (Sea Grape)
Cochemiea
Cochemiea dioica (Peninsular fishhook cactus)
Cochemiea grahamii (Graham's nipple cactus)
Cochlearia (Scurvygrasses)
Cochlearia danica (Danish Scurvy-grass)
Cochlearia officinalis (Scurvy grass)
Cocos (Coconut Palms)
Cocos nucifera (Coconut Palm)
Codiaeum
Codium (Codiums)
Codium fragile (Dead Man's Fingers)
Coffea (Coffees)
Coffea arabica (Coffee Plant)
Colchicum (Naked Ladies)
Colchicum autumnale (Autumn Crocus)
Colchicum 'Waterlily' (Waterlily Autumn Crocus)
Coleus australis (little spurflower)
Coleus scutellarioides (Coleus)
Collinsia (Blue-eyed Marys)
Collinsia heterophylla (Purple Chinese Houses)
Collinsia parviflora (small-flowered blue-eyed mary)
Collinsonia
Collinsonia canadensis (citronella horse balm)
Collomia
Collomia grandiflora (grand collomia)
Colocasia (Elephant ears)
Colocasia esculenta (Taro)
Columnea (Columnea)
Comandra
Comandra umbellata (bastard toadflax)
Comarum
Comarum palustre (marsh cinquefoil)
Combretum (Bushwillows)
Combretum rotundifolium (Monkey's Brush Plant)
Comesperma
Comesperma calymega (Blue Spike Milkwort)
Comesperma ericinum (Pink Matchheads)
Comesperma volubile (Love Creeper)
Commelina (dayflowers)
Commelina communis (Asiatic dayflower)
Commelina cyanea (scurvy weed)
Commelina dianthifolia (Birdbill Dayflower)
Commelina diffusa (climbing dayflower)
Commelina erecta (whitemouth dayflower)
Commelina virginica (Virginia Dayflower)
Commersonia
Commersonia bartramia (Brown Kurrajong)
Comptonia
Comptonia peregrina (Sweet Fern)
Condalia
Condalia hookeri (Brasil)
Condaliopsis
Condaliopsis obtusifolia (lotebush)
Condea
Condea emoryi (desert lavender)
Conium
Conium maculatum (poison hemlock)
Conocarpus
Conocarpus erectus (Green Buttonwood)
Conocephalum (snakeworts)
Conocephalum conicum (Great Scented Liverwort)
Conocephalum salebrosum (Snakewort)
Conoclinium (mistflowers)
Conoclinium coelestinum (Blue Mistflower)
Conoclinium dissectum (Palmleaf Mistflower)
Conopholis
Conopholis americana (American cancer-root)
Conopodium
Conopodium majus (Pignut)
Conospermum
Conospermum longifolium (Smoke Bush)
Conospermum taxifolium (Paint Brush)
Convallaria (lilies of the valley)
Convallaria majalis (lily of the valley)
Convolvulus (bindweeds)
Convolvulus angustissimus (Blushing Bindweed)
Convolvulus arvensis (field bindweed, morning glory)
Convolvulus equitans (Texas bindweed)
Coprosma (Coprosma)
Coprosma hirtella (Rough Coprosma)
Coprosma quadrifida (Prickly Currant-Bush)
Coprosma repens (Taupata)
Coptis
Coptis trifolia (threeleaf goldthread)
Corallina
Corallina officinalis (Common Coralline)
Corallorhiza (Coralroots)
Corallorhiza maculata (spotted coralroot)
Corallorhiza mertensiana (Pacific coralroot)
Cordia
Cordia boissieri (Anacahuita)
Cordyline (cabbage trees and allies)
Cordyline australis (New Zealand cabbage tree)
Cordyline fruticosa (Ti Plant)
Cordyline petiolaris (Broad leaved Palm Lily)
Cordyline rubra (red-fruited palm lily)
Cordyline stricta (Slender Palm Lily)
Coreopsis (Tickseed)
Coreopsis grandiflora 'Early Sunrise' (Early Sunrise Coreopsis)
Coreopsis lanceolata (Lance-Leaved Coreopsis)
Coreopsis leavenworthii (Leavenworth's Tickseed)
Coreopsis 'Limerock Ruby' (Limerock Ruby Coreopsis)
Coreopsis major (Greater Tickseed)
Coreopsis palmata (Stiff Tickseed)
Coreopsis rosea (Pink Tickseed)
Coreopsis tinctoria (plains coreopsis)
Coreopsis tripteris (Tall Coreopsis)
Coreopsis verticillata 'Grandiflora' (Large-flowered Tickseed)
Coreopsis verticillata 'Moonbeam' (Moonbeam coreopsis, tickseed)
Coreopsis verticillata 'Zagreb' (Zagreb Coreopsis)
Corethrogyne
Corethrogyne filaginifolia (California Aster)
Coriandrum
Coriandrum sativum (Cilantro)
Cornus (dogwoods)
Cornus alba 'Elegantissima' (variegated Tartarian dogwood)
Cornus alba 'Kesselringii' (Kesselring's Dogwood)
Cornus alternifolia (Pagoda Dogwood)
Cornus amomum (silky dogwood)
Cornus canadensis (bunchberry)
Cornus capitata (Mountain Moon Dogwood Tree)
Cornus controversa 'Variegata' (Variegated Giant Dogwood)
Cornus drummondii (roughleaf dogwood)
Cornus 'Eddie's White Wonder' (Eddie's White Wonder)
Cornus florida (eastern dogwood)
Cornus florida 'Cherokee Brave' (Cherokee Brave Dogwood)
Cornus florida 'Cherokee Chief' (Cherokee Chief Dogwood)
Cornus florida 'Cherokee Princess' (Cherokee Princess Dogwood)
Cornus hongkongensis
Cornus kousa (kousa dogwood)
Cornus kousa 'Satomi' (Satomi Kousa Dogwood)
Cornus macrophylla (Large-leaved Dogwood)
Cornus mas (Cornelian cherry)
Cornus nuttallii (western dogwood, Pacific dogwood)
Cornus racemosa (Grey Twig Dogwood)
Cornus sanguinea
Cornus sericea (red twig dogwood, red osier)
Cornus sericea 'Baileyi' (Bailey's Red-twig Dogwood)
Cornus sericea 'Flaviramea' (yellow twig dogwood)
Cornus sericea 'Kelseyi' (dwarf red twig dogwood)
Cornus unalaschkensis (bunchberry)
Corokia
Corokia cotoneaster (Wire-netting Bush)
Coronidium
Coronidium elatum (white paper daisy)
Coronidium scorpioides (button everlasting)
Correa
Correa alba (White Correa)
Correa glabra (rock correa)
Correa reflexa (Common Correa)
Cortaderia (Pampas grasses)
Cortaderia selloana (Pampas Grass)
Cortaderia selloana 'Pumila' (Dwarf Pampas Grass)
Corybas (Helmet orchids)
Corybas aconitiflorus (Spurred Helmet-orchid)
Corybas diemenicus (veined helmet-orchid)
Corybas incurvus (slaty helmet-orchid)
Corydalis (fumewort)
Corydalis aurea (golden corydalis)
Corydalis flavula (Yellow Corydalis)
Corydalis scouleri (Scouler's fumewort)
Corydalis solida (Bird-in-a-bush)
Corylopsis
Corylopsis glabrescens (Fragrant Winter Hazel)
Corylopsis pauciflora (winter hazel, buttercup winter hazel)
Corylopsis sinensis (Chinese Winter Hazel)
Corylopsis spicata (Spike Winter Hazel)
Corylus (hazels)
Corylus americana (American Hazelnut)
Corylus avellana
Corylus avellana 'Contorta' (Harry Lauder's walking stick)
Corylus colurna (Turkish Hazelnut)
Corylus cornuta (hazel)
Corylus cornuta var. californica (western hazelnut)
Corylus maxima 'Purpurea' (purple‑leaf filbert)
Corymbia (Bloodgums)
Corymbia calophylla (Marri)
Corymbia citriodora (Lemon-scented gum)
Corymbia ficifolia (Red-flowering gum)
Corymbia gummifera (Red Bloodwood)
Corymbia intermedia (Pink Bloodwood)
Corymbia maculata (Spotted Gum)
Corymbia tessellaris (Carbeen)
Corymbia torelliana (cadaghi)
Corymbia variegata (Northern Spotted Gum)
Cosmos (Cosmoses)
Cosmos atrosanguineus (chocolate cosmos)
Cosmos bipinnatus (cosmos)
Cosmos sulphureus (Yellow Cosmos)
Costus (spiral gingers)
Cotinus (smoketrees)
Cotinus coggygria (smoke tree, smoke bush)
Cotinus coggygria 'Ancot' (Golden Spirit Smoke Tree)
Cotinus coggygria Purpureus Group (purple-leaf smoke tree/bush)
Cotinus coggygria 'Royal Purple' (Royal Purple Smoke Tree)
Cotinus 'Grace' (Grace smoke tree)
Cotinus obovatus (American Smoke Tree)
Cotoneaster (Cotoneasters)
Cotoneaster adpressus 'Little Gem' (Little Gem Cotoneaster)
Cotoneaster bullatus (hollyberry cotoneaster)
Cotoneaster buxifolius (Boxwood Cotoneaster)
Cotoneaster coriaceus (Parney cotoneaster)
Cotoneaster dammeri (Bearberry Cotoneaster)
Cotoneaster franchetii (Franchet cotoneaster)
Cotoneaster glaucophyllus (Bright bead cotoneaster)
Cotoneaster hodjingensis (Hjelmqvist Cotoneaster)
Cotoneaster horizontalis (rock cotoneaster)
Cotoneaster rehderi (Bullate Cotoneaster)
Cotoneaster salicifolius (Willow-leaved Cotoneaster)
Cotoneaster salicifolius 'Repens' (creeping willowleaf cotoneaster)
Cotoneaster simonsii (Himalayan cotoneaster)
Cotoneaster × suecicus (Swedish Cotoneaster)
Cotula
Cotula australis (Common Cotula)
Cotula coronopifolia (brass buttons)
Crambe
Crambe maritima (Sea Kale)
Craspedia
Craspedia variabilis (Common Billy buttons)
Crassocephalum
Crassocephalum crepidioides (redflower ragleaf)
Crassula (Stonecrops)
Crassula connata (sand pygmyweed)
Crassula decumbens (Scilly Pigmyweed)
Crassula helmsii (New Zealand pygmyweed)
Crassula ovata (Jade Plant)
Crassula sieberiana (Australian Stonecrop)
Crataegus (hawthorns)
Crataegus douglasii (Black Hawthorn)
Crataegus gaylussacia (Suksdorf's Hawthorn)
Crataegus germanica (Medlar)
Crataegus laevigata (English Hawthorn)
Crataegus laevigata 'Paul's Scarlet' (Paul's Scarlet hawthorn)
Crataegus marshallii (parsley hawthorn)
Crataegus monogyna (common hawthorn)
Crataegus mordenensis (Morden Hawthorn)
Crataegus phaenopyrum (Washington thorn)
Crataegus x lavallei (Lavalle hawthorn)
Crepis (hawksbeards)
Crepis biennis (Rough Hawk's-beard)
Crepis vesicaria (Beaked Hawksbeard)
Crinum (Swamplilies)
Crinum × amabile (Giant Spider Lily)
Crinum americanum (Southern Swamp Crinum)
Crinum pedunculatum (mangrove lily)
Crithmum
Crithmum maritimum (rock samphire)
Crocanthemum (Frostweeds)
Crocanthemum scoparium (peak rushrose)
Crocosmia (Montbretias)
Crocosmia 'Lucifer' (Lucifer Crocosmia)
Crocosmia spp. (crocosmia)
Crocosmia x crocosmiiflora 'Lucifer' (red crocosmia)
Crocus neapolitanus (spring crocus)
Crocus × stellaris (Dutch Yellow Crocus)
Crocus tommasinianus (Tommasini's Crocus)
Crossandra (Crossandras)
Crotalaria (Rattlepods)
Crotalaria spectabilis (Showy Rattlebox)
Croton (Crotons)
Croton californicus (California croton)
Croton glandulosus (Tropic Croton)
Croton lindheimeri (Lindheimer's Doveweed)
Croton monanthogynus (Prairie Tea)
Croton setiger (turkey mullein)
Crowea
Crowea saligna (willow-leaved crowea)
Cruciata
Cruciata laevipes (Crosswort)
Cryphaea
Cryphaea heteromalla (Lateral Cryphaea)
Cryptandra
Cryptandra amara (Bitter Cryptandra)
Cryptandra tomentosa (prickly cryptandra)
Cryptantha (Annual Cryptanthas)
Cryptantha intermedia (Clearwater cryptantha)
Cryptocarya
Cryptocarya microneura (murrogun)
Cryptocarya triplinervis (Brown Laurel)
Cryptogramma
Cryptogramma crispa (parsley fern)
Cryptomeria
Cryptomeria japonica (Japanese Cedar)
Cryptomeria japonica 'Black Dragon' (Black Dragon Japanese Cedar)
Cryptomeria japonica 'Cristata' (Japanese Crested Cedar)
Cryptomeria japonica 'Elegans' (Plume Cryptomeria)
Cryptomeria japonica 'Globosa Nana' (Globe Japanese Cedar)
Cryptomeria japonica 'Pygmaea' (Dwarf Japanese Cedar)
Cryptomeria japonica 'Sekkan Sugi' (Sekkan-Sugi cryptomeria)
Cryptomeria japonica 'Yoshino' (Yoshino Japanese Cedar)
Cryptostylis
Cryptostylis erecta (bonnet orchid)
Cryptostylis leptochila (small tongue-orchid)
Cryptostylis subulata (Large Tongue Orchid)
Cryptotaenia
Cryptotaenia canadensis (honewort)
Ctenidium
Ctenidium molluscum (Comb-moss)
Cucumis (Melons & Cucumbers)
Cucumis sativus 'Marketmore 76' (Marketmore 76 Cucumber)
Cucumis sativus 'Straight Eight' (Straight Eight Cucumber)
Cucumis sativus 'Suyo Long' (Suyo Long Cucumber)
Cucurbita (gourds)
Cucurbita foetidissima (Buffalo Gourd)
Cucurbita maxima 'Hubbard' (Hubbard Winter Squash)
Cucurbita moschata 'Butternut' (Butternut Squash)
Cucurbita pepo 'Acorn' (Acorn Squash)
Cucurbita pepo 'Black Beauty' (Black Beauty Zucchini)
Cucurbita pepo 'Delicata' (Delicata Squash)
Cucurbita pepo 'Pattypan' (Pattypan Squash)
Cucurbita pepo 'Yellow Crookneck' (Yellow Crookneck Squash)
Cunila
Cunila origanoides (common dittany)
Cunninghamia
Cunninghamia lanceolata (China Fir)
Cunninghamia lanceolata 'Glauca' (Blue China Fir)
Cupaniopsis
Cupaniopsis anacardioides (Tuckeroo)
Cupaniopsis parvifolia (small-leaved tuckeroo)
Cuphea (Cigar Plants and Allies)
Cupressus (cypresses)
Cupressus × leylandii (Leyland Cypress)
Cupressus macrocarpa 'Goldcrest' (Goldcrest Monterey Cypress)
Cupressus sempervirens (Italian Cypress)
Cupressus sempervirens 'Stricta' (Italian Cypress)
Curcuma (turmerics)
Cuscuta (dodders)
Cuscuta californica (California dodder)
Cuscuta epithymum (Clover Dodder)
Cyanicula
Cyanicula caerulea (blue finger-orchid)
Cyanicula sericea (Silky Blue Orchid)
Cyanthillium
Cyanthillium cinereum (little ironweed)
Cyathea (scaly tree ferns)
Cyathea australis (rough tree-fern)
Cyathophorum
Cyathophorum bulbosum (quill moss)
Cycas
Cycas circinalis (queen sago)
Cycas revoluta (Sago Palm)
Cyclamen (Cyclamen)
Cyclamen coum (Spring cyclamen)
Cyclamen hederifolium (ivy-leaved cyclamen)
Cyclamen persicum (Florist's Cyclamen)
Cyclophyllum
Cyclophyllum coprosmoides (Coast Canthium)
Cyclospermum
Cyclospermum leptophyllum (Marsh parsley)
Cycnogeton
Cycnogeton procerus (Water Ribbons)
Cydonia
Cydonia oblonga (Quince)
Cylindropuntia (chollas)
Cylindropuntia acanthocarpa (Buckhorn Cholla)
Cylindropuntia bigelovii (Teddybear Cholla)
Cylindropuntia echinocarpa (Silver Cholla)
Cylindropuntia fosbergii (Mason Valley Cholla)
Cylindropuntia fulgida (Chain-fruit Cholla)
Cylindropuntia kleiniae (Klein's Cholla)
Cylindropuntia leptocaulis (Christmas cholla)
Cylindropuntia prolifera (Coast Cholla)
Cylindropuntia ramosissima (Branched Pencil Cholla)
Cylindropuntia whipplei (Whipple's Cholla)
Cymbalaria
Cymbalaria muralis (Ivy-leaved toadflax)
Cymbidium (Boat Orchids)
Cymbidium canaliculatum (Channelled boat-lip orchid)
Cymbidium madidum (Arrowroot Orchid)
Cymbidium suave (Snake Orchid)
Cymbonotus
Cymbonotus preissianus (Austral bear’s-ears)
Cymbopogon (Lemon Grasses)
Cymbopogon refractus (barbwire grass)
Cynanchica
Cynanchica pyrenaica (Squinancywort)
Cynanchum
Cynanchum laeve (honey-vine climbing milkweed)
Cynara
Cynara cardunculus (artichoke, cardoon)
Cynodon (Bermuda Grasses)
Cynodon dactylon (Bermuda Grass)
Cynoglossum (Hound's-tongues)
Cynoglossum australe (Australian Hound's-tongue)
Cynoglossum officinale (hound's-tongue)
Cynosurus
Cynosurus cristatus (crested dogtail grass)
Cyperus (Flatsedges)
Cyperus croceus (Baldwin's Flatsedge)
Cyperus eragrostis (tall flatsedge)
Cyperus odoratus (Fragrant flatsedge)
Cyperus polystachyos (Bunchy flat-sedge)
Cyperus rotundus (Purple Nutsedge)
Cyperus strigosus (straw-colored flatsedge)
Cypripedium
Cypripedium acaule (pink lady's slipper)
Cypripedium parviflorum (yellow lady's slipper)
Cypripedium spp. (lady's slipper)
Cyrilla
Cyrilla racemiflora (Swamp titi)
Cyrtomium
Cyrtomium caryotideum (Fish-tail Holly Fern)
Cyrtomium falcatum (Japanese Holly Fern)
Cyrtomium fortunei (Fortune's Holly Fern)
Cyrtomium macrophyllum (Large-leaved Holly Fern)
Cyrtostachys
Cyrtostachys renda (Sealing Wax Palm)
Cyrtostylis
Cyrtostylis reniformis (Gnat orchid)
Cyrtostylis robusta (large gnat-orchid)
Cystopteris (fragile ferns)
Cystopteris bulbifera (bulblet fern)
Cystopteris fragilis (brittle bladderfern)
Cystopteris protrusa (lowland brittle fern)
Cytisus (brooms)
Cytisus scoparius (Scotch broom)
Daboecia
Daboecia cantabrica (Irish Heath)
Daboecia cantabrica f. alba (White Irish Heath)
Dactylis
Dactylis glomerata (orchard grass)
Dactylorhiza (Marsh orchids)
Dactylorhiza fuchsii (Common Spotted Orchid)
Dactylorhiza incarnata (Early Marsh-orchid)
Dactylorhiza maculata (heath spotted orchid)
Dactylorhiza praetermissa (Southern Marsh-orchid)
Dactylorhiza purpurella (Northern Marsh-orchid)
Dactylorhiza viridis (Frog Orchid)
Dahlia (Dahlias)
Dahlia 'Cafe au Lait' (Cafe au Lait Dahlia)
Dahlia Hybrids (dahlia)
Dahlia merckii (Bedding Dahlia)
Dahlia pinnata (Garden Dahlia)
Dalea (prairie clovers)
Dalea candida (white prairie clover)
Dalea formosa (feather dalea)
Dalea purpurea (purple prairie clover)
Dampiera
Dampiera purpurea (Purple Dampiera)
Dampiera stricta (Blue Dampiera)
Danthonia
Danthonia spicata (Poverty Oat Grass)
Daphne
Daphne burkwoodii (Burkwood Daphne)
Daphne caucasica (Caucasian Daphne)
Daphne cneorum (Rose Daphne)
Daphne laureola (spurge daphne)
Daphne mezereum (February daphne)
Daphne odora (Winter Daphne)
Daphne odora 'Aureomarginata' (variegated winter daphne)
Daphne tangutica (Tangut Daphne)
Daphne x transatlantica 'Summer Ice' (Summer Ice hybrid daphne)
Daphniphyllum
Daphniphyllum macropodum (Himalayan Daphniphyllum)
Darlingtonia
Darlingtonia californica (California pitcher plant)
Darmera
Darmera peltata (umbrella plant)
Darwinia
Darwinia fascicularis (clustered darwinia)
Dasiphora (shrubby cinquefoils)
Dasiphora fruticosa (potentilla, cinquefoil)
Dasylirion (sotols)
Dasylirion texanum (Texas sotol)
Dasylirion wheeleri (Wheeler sotol)
Dasyochloa
Dasyochloa pulchella (Fluffgrass)
Datura (Devil's Trumpets)
Datura metel (Devil's Trumpet Plant)
Datura stramonium (jimsonweed)
Datura wrightii (Sacred Datura)
Daucus (carrots)
Daucus carota (Queen Ann's lace)
Daucus carota 'Danvers' (Danvers Carrot)
Daucus carota 'Nantes' (Nantes Carrot)
Daucus carota 'Rainbow' (Rainbow Carrot Mix)
Daucus carota subsp. sativus 'Chantenay' (Chantenay Carrot)
Daucus carota subsp. sativus 'Danvers 126' (Danvers 126 Carrot)
Daucus carota subsp. sativus 'Imperator' (Imperator Carrot)
Daucus carota subsp. sativus 'Nantes' (Nantes Carrot)
Daucus carota subsp. sativus 'Rainbow' (Rainbow Carrots)
Daucus glochidiatus (Australian Carrot)
Daucus pusillus (American wild carrot)
Davallia (rabbit's foot ferns)
Davidia
Davidia involucrata (dove tree)
Daviesia
Daviesia brevifolia (Leafless Bitter-pea)
Daviesia latifolia (hop bitter-pea)
Daviesia leptophylla (narrow-leaf bitter-pea)
Daviesia ulicifolia (gorse bitter pea)
Daviesia villifera (prickly daviesia)
Dawsonia
Dawsonia superba (giant moss)
Decodon
Decodon verticillatus (swamp loosestrife)
Deinandra
Deinandra fasciculata (Clustered Tarweed)
Delairea
Delairea odorata (Cape-ivy)
Delonix
Delonix regia (Royal Poinciana)
Delosperma (Sheepfigs)
Delosperma congestum 'Gold Nugget' (Gold Nugget Ice Plant)
Delosperma × 'Fire Spinner' (Fire Spinner Ice Plant)
Delosperma sutherlandii (Sutherland's Ice Plant)
Delphinium (larkspurs)
Delphinium ajacis (doubtful knight's-spur)
Delphinium carolinianum (Wild Blue Larkspur)
Delphinium Hybrids (delphinium)
Delphinium menziesii (Menzies' Larkspur)
Delphinium nudicaule (Red larkspur)
Delphinium nuttallianum (Upland Larkspur)
Delphinium patens (Zigzag Larkspur)
Delphinium spp. (delphinium)
Delphinium tricorne (dwarf larkspur)
Delphinium trolliifolium (Streambank Larkspur)
Dendroalsia
Dendroalsia abietina (dendroalsia moss)
Dendrobium
Dendrobium kingianum (pink rock orchid)
Dendrobium linguiforme (tongue orchid)
Dendrobium speciosum (rock orchid)
Dendrocnide
Dendrocnide excelsa (Giant Stinging Tree)
Dendrolycopodium (tree-clubmosses)
Dendrolycopodium dendroideum (prickly tree-clubmoss)
Dendrolycopodium obscurum (flat-branched tree-clubmoss)
Dendromecon
Dendromecon rigida (Bush Poppy)
Dennstaedtia
Dennstaedtia punctilobula (Hay-Scented Fern)
Deparia
Deparia acrostichoides (silvery glade fern)
Dermatophyllum
Dermatophyllum secundiflorum (Texas mountain laurel)
Deschampsia
Deschampsia cespitosa (tufted hairgrass)
Deschampsia flexuosa (Wavy Hair Grass)
Descurainia (Tansymustards)
Descurainia pinnata (Western Tansymustard)
Descurainia sophia (flixweed)
Descurainia spp. (tansy mustard)
Desmanthus (bundleflowers)
Desmanthus illinoensis (Illinois bundleflower)
Desmodium (ticktrefoils)
Desmodium canadense (showy tick-trefoil)
Desmodium incanum (creeping beggarweed)
Desmodium paniculatum (panicled ticktrefoil)
Desmodium rhytidophyllum (Rusty tick-trefoil)
Deutzia
Deutzia gracilis (slender deutzia)
Dianella (flax-lilies)
Dianella brevicaulis (Coast Flax-Lily)
Dianella longifolia (Pale Flax-Lily)
Dianella revoluta (Blueberry Lily)
Dianella tasmanica
Dianthus (carnations)
Dianthus arenarius (sand pink)
Dianthus armeria (Deptford pink)
Dianthus barbatus (sweet William)
Dianthus carthusianorum (Carthusian Pink)
Dianthus × 'Coconut Surprise' (Coconut Surprise Dianthus)
Dianthus cruentus
Dianthus deltoides
Dianthus gratianopolitanus (pinks)
Dianthus × 'Sugar Plum' (Sugar Plum Dianthus)
Diaperia
Diaperia prolifera (flathead rabbit tobacco)
Dicentra (Bleedinghearts)
Dicentra canadensis (squirrel corn)
Dicentra cucullaria (Dutchman's breeches)
Dicentra formosa (Pacific bleeding heart)
Dicentra formosa 'Bacchanal' (Bacchanal Bleeding Heart)
Dicentra 'King of Hearts' (King of Hearts Bleeding Heart)
Dicentra 'Luxuriant' (Luxuriant Bleeding Heart)
Dicentra spectabilis (Bleeding Heart)
Dichanthelium (rosette grasses)
Dichanthelium clandestinum (deertongue)
Dichanthelium oligosanthes (Heller's Rosette Grass)
Dichelostemma
Dichelostemma congestum (Ookow)
Dichondra (ponysfoots)
Dichondra carolinensis (Carolina ponysfoot)
Dichondra repens (kidney weed)
Dichorisandra
Dichorisandra thyrsiflora (Blue Ginger)
Dicksonia
Dicksonia antarctica (man fern)
Dicranella
Dicranella heteromalla (Silky Forklet-moss)
Dicranoweisia
Dicranoweisia cirrata (Common Pincushion)
Dicranum (Forkmosses)
Dicranum scoparium (Broom Forkmoss)
Didymodon
Dieffenbachia (mother-in-law's-tongues)
Dieffenbachia seguine (Dumb Cane)
Dierama
Dierama pulcherrimum (Angel's Fishing Rod)
Diervilla
Diervilla lonicera (northern bush honeysuckle)
Diervilla rivularis (Bush Honeysuckle)
Diervilla × splendens (Bush Honeysuckle)
Dieteria (tansyasters)
Dieteria canescens (Hoary Tansyaster)
Dietes (Fortnight Lilies)
Dietes bicolor (Yellow Fortnight Lily)
Dietes grandiflora (Large Fortnight Lily)
Digitalis ferruginea (Rusty Foxglove)
Digitalis grandiflora (Large Yellow Foxglove)
Digitalis isabelliana
Digitalis laevigata (Grecian Foxglove)
Digitalis lutea (yellow foxglove)
Digitalis obscura (Sunset Foxglove)
Digitalis parviflora (Small-flowered Foxglove)
Digitalis purpurea (common foxglove)
Digitalis purpurea 'Excelsior' (Excelsior Foxglove)
Digitalis thapsi (Spanish Foxglove)
Digitaria (crabgrasses, cottontops, and allies)
Digitaria sanguinalis (Hairy Crabgrass)
Dillwynia (egg and bacon peas)
Dillwynia cinerascens (grey parrot pea)
Dillwynia floribunda (Parrot Pea)
Dillwynia glaberrima (Smooth Parrot-pea)
Dillwynia hispida (red parrot-pea)
Dillwynia phylicoides (small-leaf parrot-pea)
Dillwynia retorta (heathy parrot pea)
Dillwynia sericea (showy parrot-pea)
Dimorphotheca (Afro-Australian daisies)
Diodia
Diodia virginiana (buttonweed)
Dioscorea (Cinnamon vines)
Dioscorea bulbifera (air potato)
Dioscorea communis (Black Bryony)
Dioscorea polystachya (Chinese yam)
Dioscorea transversa (Common Yam Vine)
Dioscorea villosa (wild yam)
Diospyros (persimmons)
Diospyros geminata (scaly ebony)
Diospyros kaki (Japanese Persimmon)
Diospyros lotus (Date Plum)
Diospyros texana (Texas Persimmon)
Diospyros virginiana (American Persimmon)
Diphasiastrum (Ground cedars)
Diphasiastrum digitatum (fan clubmoss)
Diphylleia
Diphylleia cymosa (Umbrella Leaf)
Diplacus
Diplacus aurantiacus (orange bush monkeyflower)
Diplacus × australis (San Diego Monkeyflower)
Diplacus longiflorus (southern bush monkeyflower)
Diplacus puniceus (red bush monkeyflower)
Diplarrena moraea (Australian white iris)
Diploglottis
Diploglottis australis (Native Tamarind)
Diplophyllum
Diplophyllum albicans (White Earwort)
Diplotaxis (Wall-Rockets)
Diplotaxis muralis (annual wall-rocket)
Diplotaxis tenuifolia (Perennial Wall-rocket)
Dipodium
Dipodium punctatum (Blotched Hyacinth-Orchid)
Dipodium roseum (Rosy Hyacinth Orchid)
Dipodium variegatum (Slender Hyacinth-Orchid)
Dipogon
Dipogon lignosus (Okie bean)
Dipsacus (teasels)
Dipsacus fullonum (common teasel)
Dipsacus laciniatus (cutleaf teasel)
Dipsacus pilosus (small teasel)
Dipsacus sativus (fuller's teasel)
Dipterostemon
Dipterostemon capitatus (blue dicks)
Dirca
Dirca palustris (eastern leatherwood)
Disa
Disa bracteata (Bract Disa)
Disanthus
Disanthus cercidifolius (Disanthus)
Disphyma
Disphyma crassifolium (Purple Dewplant)
Disporopsis
Disporopsis pernyi (Pernyi's Disporopsis)
Disporum
Disporum uniflorum (Yellow Fairybells)
Distichlis
Distichlis distichophylla (Australian Salt-grass)
Distichlis spicata (Saltgrass)
Distimake
Distimake dissectus (Alamo vine)
Dittrichia
Dittrichia graveolens (Stinkwort)
Diuris (Double Tails)
Diuris chryseopsis (Common Golden Moths)
Diuris orientis (Wallflower orchid)
Diuris pardina (Leopard Orchid)
Diuris sulphurea (Tiger Orchid)
Dodonaea (Hop-bushes)
Dodonaea triquetra (Common Hop Bush)
Dodonaea viscosa (Akeake)
Dodonaea viscosa 'Purpurea'
Doellingeria
Doellingeria umbellata (flat-top white aster)
Dolichandra
Dolichandra unguis-cati (Catclaw vine)
Doodia
Doodia aspera (Prickly Rasp fern)
Doodia caudata (Small Rasp Fern)
Doronicum pardalianches (Leopard's-bane)
Doryanthes
Doryanthes excelsa (Gymea Lily)
Draba (Drabas)
Draba aizoides (Yellow Whitlow Grass)
Draba verna (Common Whitlowgrass)
Dracaena (Dragon Trees)
Dracaena fragrans (Corn Plant)
Dracaena masoniana (Whale Fin Snake Plant)
Dracaena reflexa (Song of India)
Dracaena zeylanica (Ceylon Bowstring Hemp)
Dracocephalum
Dracocephalum grandiflorum (Large-flowered Dragonhead)
Dracophyllum
Dracophyllum secundum (necklace heath)
Dracunculus
Dracunculus vulgaris (dragon arum)
Drosanthemum (Dewfigs)
Drosera (Sundews)
Drosera aberrans (Scented Sundew)
Drosera anglica (Great Sundew)
Drosera auriculata (Tall sundew)
Drosera binata (Fork-leaved Sundew)
Drosera burmanni (tropical sundew)
Drosera capillaris (Pink Sundew)
Drosera collina
Drosera glanduligera (Pimpernel sundew)
Drosera gunniana
Drosera hookeri (Grassland Sundew)
Drosera intermedia (spoonleaf sundew)
Drosera macrantha (Bridal Rainbow)
Drosera pallida (Pale Rainbow)
Drosera planchonii (Climbing Sundew)
Drosera pygmaea (pygmy sundew)
Drosera rotundifolia (round-leaved sundew)
Drosera spatulata (Rosy Sundew)
Drosera whittakeri (Whittaker's sundew)
Drymocallis
Drymocallis arguta (Tall Cinquefoil)
Drymocallis glandulosa (Sticky Cinquefoil)
Drynaria
Drynaria rigidula (basket fern)
Dryopteris (wood ferns)
Dryopteris affinis (Golden-scaled Male-fern)
Dryopteris arguta (coastal woodfern)
Dryopteris atrata
Dryopteris carthusiana (spinulose wood fern)
Dryopteris crassirhizoma (Thick-stemmed Wood Fern)
Dryopteris cycadina (Shaggy Wood Fern)
Dryopteris dilatata (broad buckler-fern)
Dryopteris erythrosora (autumn fern)
Dryopteris expansa (coast shield fern)
Dryopteris filix-mas (Male Fern)
Dryopteris intermedia (intermediate wood fern)
Dryopteris lepidopoda (Sunset Fern)
Dryopteris marginalis (marginal wood fern)
Dryopteris sieboldii
Dryopteris spp. (Mixed Hardy Ferns)
Dryopteris wallichiana (Wallich's Wood Fern)
Drypetes
Drypetes deplanchei (Yellow Tulipwood)
Duboisia
Duboisia myoporoides (corkwood)
Dudleya (Liveforever)
Dudleya cymosa (Canyon liveforever)
Dudleya edulis (Fingertips)
Dudleya farinosa (Bluff Lettuce)
Dudleya lanceolata (lanceleaf liveforever)
Dudleya pulverulenta (Chalk Dudleya)
Dulichium
Dulichium arundinaceum (Three-way Sedge)
Duma
Duma florulenta (Tangled Lignum)
Duranta
Duranta erecta (Golden Dewdrop)
Dypsis
Dypsis lutescens (Areca Palm)
Dyschoriste
Dyschoriste nagchana
Dysphania
Dysphania ambrosioides (Mexican tea)
Echeveria (echeveria)
Echeveria elegans (Mexican Gem)
Echinacea (coneflowers)
Echinacea angustifolia (Narrow-leaved Coneflower)
Echinacea × 'Cheyenne Spirit' (Cheyenne Spirit Coneflower)
Echinacea Hybrids (coneflower)
Echinacea 'Kim's Knee High' (Kim's Knee High Coneflower)
Echinacea pallida (Pale Purple Coneflower)
Echinacea paradoxa (Yellow Coneflower)
Echinacea purpurea (Purple Coneflower)
Echinacea purpurea 'Bravado' (Bravado Purple Coneflower)
Echinacea purpurea 'Magnus' (Magnus Purple Coneflower)
Echinacea purpurea 'PowWow White' (PowWow White Coneflower)
Echinacea purpurea 'PowWow Wild Berry' (PowWow Wild Berry Coneflower)
Echinacea purpurea 'Ruby Star' (Ruby Star Coneflower)
Echinacea purpurea 'Sombrero Salsa Red' (Sombrero Salsa Red Coneflower)
Echinacea purpurea 'White Swan' (White Swan Coneflower)
Echinacea simulata (Wavy-Leaved Purple Coneflower)
Echinochloa (Barnyard Grasses)
Echinochloa crus-galli (barnyardgrass)
Echinocystis
Echinocystis lobata (prickly cucumber)
Echinops (Globe thistles)
Echinops bannaticus (Blue Globe Thistle)
Echinops exaltatus (Russian Globe Thistle)
Echinopsis (South American hedgehog cactuses)
Echinops sphaerocephalus (Great Globe Thistle)
Echium (Viper's-buglosses)
Echium candicans (Pride of Madeira)
Echium pininana (Giant Viper's-bugloss)
Echium plantagineum (purple viper's-bugloss)
Echium vulgare (blueweed)
Echium webbii
Eclipta
Eclipta prostrata (False Daisy)
Edgeworthia
Edgeworthia chrysantha (edgeworthia, paperbush)
Edraianthus
Edraianthus graminifolius (Grassy Bells)
Egeria
Egeria densa (Brazilian egeria)
Ehretia
Ehretia anacua (Anacua)
Ehrharta
Ehrharta erecta (panic veldtgrass)
Ehrharta longiflora (longflower veldtgrass)
Elaeagnus (oleasters)
Elaeagnus angustifolia (Russian olive)
Elaeagnus pungens (silverberry)
Elaeagnus pungens 'Maculata' (Golden Variegated Elaeagnus)
Elaeagnus umbellata (autumn olive)
Elaeocarpus
Elaeocarpus grandis (blue quandong)
Elaeocarpus obovatus (Hard Quandong)
Elaeocarpus reticulatus (Blueberry ash)
Elaeodendron
Elaeodendron australe (Red-fruited Olive Plum)
Elaphoglossum (tongueferns)
Elegia (Goldreeds)
Eleocharis (spikerushes)
Eleocharis ovata (Ovoid Spikerush)
Eleocharis palustris (Common Spikerush)
Elephantopus (Elephant's Feet)
Elephantopus carolinianus (leafy elephant's-foot)
Elephantopus tomentosus (common elephant's-foot)
Eleusine
Eleusine indica (Goose Grass)
Elleanthus
Elliottia pyroliflora (copperbush)
Elsholtzia
Elsholtzia stauntonii
Elymus (wild ryes and wheatgrasses)
Elymus athericus (sea couch)
Elymus canadensis (Canada wild rye)
Elymus elymoides (Squirreltail)
Elymus glaucus (blue wildrye)
Elymus hystrix (Bottlebrush Grass)
Elymus magellanicus (Magellan Wheatgrass)
Elymus repens (quackgrass)
Elymus virginicus (Virginia wildrye)
Elythranthera
Elythranthera brunonis (purple enamel orchid)
Embelia
Embelia australiana (Embelia)
Embothrium
Embothrium coccineum (Chilean fire tree)
Emilia (Tasselflowers)
Emilia fosbergii (Red Tasselflower)
Emilia sonchifolia (lilac tasselflower)
Emmenanthe
Emmenanthe penduliflora (whispering bells)
Empetrum
Empetrum nigrum (black crowberry)
Encelia (brittlebushes)
Encelia californica (California brittlebush)
Encelia farinosa (Brittlebush)
Enchylaena
Enchylaena tomentosa (Barrier Saltbush)
Enemion
Enemion biternatum (false rue anemone)
Engelmannia
Engelmannia peristenia (Engelmann daisy)
Enkianthus
Enkianthus campanulatus (enkianthus)
Enkianthus perulatus (White Enkianthus)
Enkianthus serrulatus (white bell enkianthus)
Ensete
Ensete ventricosum (Ethiopian Banana)
Entodon (Entodon mosses)
Entodon seductrix (seductive entodon moss)
Entolasia
Entolasia stricta (Wiry Panic)
Epacris
Epacris impressa (Common Heath)
Epacris longiflora (Fuchsia Heath)
Epacris microphylla (Coral Heath)
Epacris obtusifolia (blunt-leaf heath)
Epacris pulchella (New South Wales Coral Heath)
Ephedra (Jointfirs)
Ephedra viridis (Green Ephedra)
Epidendrum
Epidendrum ibaguense (Reed Orchid)
Epifagus
Epifagus virginiana (Beechdrops)
Epigaea
Epigaea repens (trailing arbutus)
Epilobium (willowherbs)
Epilobium brachycarpum (panicled willowherb)
Epilobium brunnescens (New Zealand Willowherb)
Epilobium canum (California fuchsia)
Epilobium ciliatum (common willowherb (native))
Epilobium coloratum (cinnamon willowherb)
Epilobium hirsutum (Great Willowherb)
Epilobium montanum (Broad-leaved Willowherb)
Epilobium parviflorum (Hoary Willowherb)
Epilobium tetragonum (Square-stemmed Willowherb)
Epimedium (barrenworts)
Epimedium acuminatum (Pointed-leaved Barrenwort)
Epimedium 'Amber Queen'
Epimedium davidii (David's Barrenwort)
Epimedium grandiflorum 'Lilafee'
Epimedium grandiflorum 'White Queen'
Epimedium pinnatum ssp. colchicum (epimedium-pinnatum-ssp-colchicum)
Epimedium pubigerum
Epimedium ssp. (barrenwort)
Epimedium x perralchicum 'Frohnleiten' (Frohnleiten Epimedium)
Epimedium x rubrum
Epipactis (Helleborines)
Epipactis gigantea (Stream Orchid)
Epipactis helleborine (Broad-leaved helleborine)
Epipactis palustris (Marsh Helleborine)
Epiphyllum
Epiphyllum chrysocardium (Fern Leaf Cactus)
Epipremnum
Epipremnum aureum (Golden Pothos)
Epipremnum aureum 'Marble Queen' (Marble Queen Pothos)
Epipremnum aureum 'N'Joy' (N'Joy Pothos)
Epipremnum pinnatum (Dragon Tail Plant)
Episcia
Episcia cupreata (Episcia Flame Violet)
Equisetum (horsetails)
Equisetum arvense (common horsetail (native))
Equisetum × ferrissii (Ferriss' horsetail)
Equisetum fluviatile (water horsetail)
Equisetum hyemale (scouring rush)
Equisetum laevigatum (smooth horsetail)
Equisetum palustre (marsh horsetail)
Equisetum sylvaticum (wood horsetail)
Equisetum telmateia (great horsetail)
Eragrostis (Lovegrasses)
Eragrostis curvula (African love grass)
Eragrostis spectabilis (Purple Lovegrass)
Eranthis
Eranthis hyemalis (Winter Aconite)
Erechtites
Erechtites hieraciifolius (American burnweed)
Eremalche
Eremalche rotundifolia (desert fivespot)
Eremochloa
Eremochloa ophiuroides (Centipede Grass)
Eremochloa ophiuroides (Centipede Grass)
Eremophila
Eremophila debilis (Winter Apple)
Eremophila glabra (Common Emu-Bush)
Eremophila longifolia (Weeping Emubush)
Eremophila nivea
Eremothera
Eremothera boothii (Booth's Evening Primrose)
Erica (Heaths)
Erica carnea (Heath)
Erica lusitanica (Portuguese Heath)
Ericameria (goldenbushes)
Ericameria ericoides (California Goldenbush)
Ericameria linearifolia (narrowleaf goldenbush)
Ericameria nauseosa (Rubber Rabbitbrush)
Erica spp. (heath)
Erica tetralix (Cross-leaved Heath)
Erigenia
Erigenia bulbosa (harbinger of spring)
Erigeron (fleabanes and horseweeds)
Erigeron acris (bitter fleabane)
Erigeron annuus (annual fleabane)
Erigeron bonariensis (Flax-leaved Horseweed)
Erigeron canadensis (horseweed)
Erigeron compositus (cut-leaf fleabane)
Erigeron divergens (spreading fleabane)
Erigeron floribundus (Tall Fleabane)
Erigeron foliosus (Leafy Fleabane)
Erigeron glacialis (Subalpine Fleabane)
Erigeron glaucus (Seaside Fleabane)
Erigeron karvinskianus (Mexican Fleabane)
Erigeron karvinskianus spp. (Mexican fleabane)
Erigeron modestus (Plains fleabane)
Erigeron peregrinus (Wandering Fleabane)
Erigeron philadelphicus (Philadelphia Fleabane)
Erigeron pulchellus (robin's-plantain)
Erigeron quercifolius (oakleaf fleabane)
Erigeron speciosus (Showy Fleabane)
Erigeron strigosus (daisy fleabane)
Erigeron sumatrensis (tropical horseweed)
Erinus
Erinus alpinus (Fairy Foxglove)
Eriobotrya (Loquats)
Eriobotrya japonica (Loquat)
Eriocapitella (Fall-blooming anemones)
Eriocapitella hupehensis (Hubei Anemone)
Eriocapitella × hybrida (Japanese Anemone)
Eriocephalus (Kapokbushes)
Eriochilus
Eriochilus cucullatus (Parson's Bands)
Eriocoma
Eriocoma hymenoides (Sand Ricegrass)
Eriodictyon (yerba santa)
Eriodictyon californicum (California yerba santa)
Eriodictyon crassifolium (Thick-leaved Yerba Santa)
Eriogonum (wild buckwheats)
Eriogonum compositum (Arrowleaf Buckwheat)
Eriogonum fasciculatum (California Buckwheat)
Eriogonum heracleoides (Parsnip-flowered Buckwheat)
Eriogonum inflatum (Desert Trumpet)
Eriogonum latifolium (Seaside Buckwheat)
Eriogonum nudum (Naked Buckwheat)
Eriogonum ovalifolium (cushion buckwheat)
Eriogonum parvifolium (Seacliff Wild Buckwheat)
Eriogonum strictum (Strict Buckwheat)
Eriogonum umbellatum (Sulfur Buckwheat)
Eriogonum wrightii (Wright's buckwheat)
Eriophorum (Cottongrasses)
Eriophorum angustifolium (Common Cottongrass)
Eriophorum chamissonis
Eriophorum vaginatum (tussock cottongrass)
Eriophorum virginicum (tawny cottongrass)
Eriophyllum (Woolly sunflowers)
Eriophyllum confertiflorum (Golden Yarrow)
Eriophyllum lanatum (Oregon Sunshine)
Eriophyllum staechadifolium (seaside woolly sunflower)
Eriophyllum wallacei (Wallace's woollydaisy)
Eriospermum (Woolseeds)
Eriostemon
Eriostemon australasius (pink wax flower)
Erodium (stork's-bills)
Erodium botrys (Mediterranean Stork's-bill)
Erodium chrysanthum (Yellow Stork's Bill)
Erodium cicutarium (Redstem Stork's-bill)
Erodium moschatum (musk stork's-bill)
Erodium texanum (Texas stork's bill)
Eruca
Eruca sativa (Arugula)
Eryngium (Eryngos)
Eryngium agavifolium (Agave-leaved Sea Holly)
Eryngium alpinum (Alpine Sea Holly)
Eryngium amethystinum (Amethyst Sea Holly)
Eryngium giganteum (Miss Wilmott's ghost)
Eryngium Hybrids (sea holly)
Eryngium leavenworthii (Leavenworth's eryngo)
Eryngium maritimum (Sea Holly)
Eryngium ovinum (blue devil)
Eryngium planum (Blue Eryngo)
Eryngium yuccifolium (Rattlesnake Master)
Erysimum (wallflower)
Erysimum capitatum (Western Wallflower)
Erysimum × cheiri (Wallflower)
Erythranthe (monkeyflowers)
Erythranthe cardinalis (Scarlet Monkeyflower)
Erythranthe guttata (yellow monkey-flower)
Erythranthe lewisii (Great Purple Monkeyflower)
Erythrina (Coral trees)
Erythrina crista-galli (Cockspur coral tree)
Erythrina herbacea (Eastern Coral Bean)
Erythronium (fawn lilies)
Erythronium albidum (white fawnlily)
Erythronium americanum (Yellow Trout Lily)
Erythronium grandiflorum (Glacier Lily)
Erythronium hendersonii (Fawn Lily)
Erythronium oregonum (Oregon fawn lily)
Erythronium 'Pagoda' (Pagoda fawn lily)
Erythronium revolutum (coast fawn lily)
Erythronium umbilicatum (dimpled trout lily)
Escallonia 'Newport Dwarf' (Newport Dwarf Escallonia)
Escallonia × rigida (Escallonia Hybrid)
Escallonia rubra (redclaws)
Escallonia spp. (escallonia)
Eschscholzia
Eschscholzia californica (California poppy)
Eschscholzia minutiflora (Little Gold Poppy)
Escobaria
Escobaria vivipara (Spinystar)
Eubotrys
Eubotrys racemosus (fetterbush)
Eucalyptus (eucalyptus)
Eucalyptus arenacea (desert stringybark)
Eucalyptus camaldulensis (River Red Gum)
Eucalyptus coccifera (Tasmanian Snow Gum)
Eucalyptus crebra (Narrow-leaved Red Ironbark)
Eucalyptus cypellocarpa (mountain grey gum)
Eucalyptus deglupta (Rainbow Eucalyptus Tree)
Eucalyptus diversifolia (Coastal Mallee)
Eucalyptus fasciculosa (Pink Gum)
Eucalyptus globulus (Tasmanian Blue Gum)
Eucalyptus grandis (Flooded Gum)
Eucalyptus gunnii (Silver Drop Eucalyptus)
Eucalyptus incrassata (Ridge-fruited mallee)
Eucalyptus leucoxylon (Yellow gum)
Eucalyptus melliodora (Yellow Box)
Eucalyptus microcorys (Tallowwood)
Eucalyptus neglecta (Omeo Gum)
Eucalyptus obliqua (Messmate Stringybark)
Eucalyptus ovata (Swamp Gum)
Eucalyptus pauciflora ssp. debeuzevillei (Jounama Snow Gum)
Eucalyptus pauciflora ssp. niphophila (Alpine Snow Gum)
Eucalyptus pilularis (Blackbutt)
Eucalyptus polyanthemos (Silver Dollar Gum)
Eucalyptus racemosa (Northern Scribbly Gum)
Eucalyptus regnans (Australian Mountain Ash)
Eucalyptus robusta (Swamp Mahogany)
Eucalyptus sideroxylon (Red Ironbark)
Eucalyptus spp. (eucalyptus)
Eucalyptus tereticornis (Forest red gum)
Eucalyptus viminalis (manna gum)
Eucryphia
Eucryphia cordifolia (eucryphia)
Eucryphia glutinosa (Brush Bush)
Eucrypta
Eucrypta chrysanthemifolia (common eucrypta)
Eugenia
Eulobus
Eulobus californicus (California primrose)
Eulophia
Eulophia picta (Shepherd's Crook Orchid)
Euonymus (spindles)
Euonymus alatus (Burning Bush)
Euonymus alatus 'Compactus' (dwarf winged euonymus)
Euonymus americanus (strawberry bush)
Euonymus atropurpureus (wahoo)
Euonymus europaeus (Spindle)
Euonymus fortunei (wintercreeper)
Euonymus fortunei 'Emerald Gaiety' (Emerald Gaiety Euonymus)
Euonymus fortunei 'Kewensis'
Euonymus japonicus (Japanese Euonymus)
Eupatorium (bonesets)
Eupatorium altissimum (tall boneset)
Eupatorium cannabinum (hemp agrimony)
Eupatorium capillifolium (dogfennel)
Eupatorium maculatum 'Gateway' (Gateway Joe Pye Weed)
Eupatorium perfoliatum (Boneset)
Eupatorium serotinum (late boneset)
Euphorbia (Spurges)
Euphorbia albomarginata (Whitemargin Sandmat)
Euphorbia amygdaloides (wood spurge)
Euphorbia amygdaloides var. robbiae
Euphorbia bicolor (snow-on-the-prairie)
Euphorbia ceratocarpa
Euphorbia characias ssp. 'Tasmanian Tiger' (Tasmanian Tiger Spurge)
Euphorbia characias wulfenii (Mediterranean spurge)
Euphorbia cornigera (Horned Spurge)
Euphorbia corollata (flowering spurge)
Euphorbia cyathophora (wild poinsettia)
Euphorbia cyparissias (cypress spurge)
Euphorbia dentata (green poinsettia)
Euphorbia dulcis 'Chameleon' (Chameleon Spurge)
Euphorbia griffithii (orange spurge)
Euphorbia helioscopia (Sun spurge)
Euphorbia hirta (Asthma Plant)
Euphorbia hypericifolia (Diamond Frost Euphorbia)
Euphorbia lactea (Dragon Bones)
Euphorbia lathyris (caper spurge)
Euphorbia maculata (Spotted spurge)
Euphorbia marginata (snow-on-the-mountain)
Euphorbia mellifera (Honey Spurge)
Euphorbia milii (Crown-of-Thorns)
Euphorbia myrsinites (Myrtle Spurge)
Euphorbia nicaeensis
Euphorbia nutans (nodding spurge)
Euphorbia oblongata (eggleaf spurge)
Euphorbia palustris
Euphorbia paralias (Sea Spurge)
Euphorbia peplus (petty spurge)
Euphorbia polycarpa (smallseed sandmat)
Euphorbia polychroma
Euphorbia portlandica (Portland Spurge)
Euphorbia prostrata (prostrate sandmat)
Euphorbia pulcherrima (Poinsettia)
Euphorbia seguieriana
Euphorbia serpens (creeping spurge)
Euphorbia tirucalli (Fire Stick)
Euphorbia virgata (leafy spurge)
Euphorbia x pasteurii
Euphrasia (eyebrights)
Euphrasia collina (purple eyebright)
Euphrasia nemorosa (Common Eyebright)
Eupomatia
Eupomatia laurina (Bolwarra)
Eurhynchium
Eurhynchium striatum (Common Striated Feather-moss)
Euroschinus
Euroschinus falcatus (Blush Cudgerie)
Eurya
Eurybia (wood asters)
Eurybia divaricata (White Wood Aster)
Eurybia divaricata (white wood aster)
Eurybia macrophylla (large-leaved aster)
Euryomyrtus
Euryomyrtus ramosissima (Rosy Heath-myrtle)
Euryops (True-eye Daisies)
Eustrephus
Eustrephus latifolius (Wombat Berry)
Eutaxia
Eutaxia microphylla (common eutaxia)
Euthamia (grass-leaved goldenrods)
Euthamia caroliniana (slender goldentop)
Euthamia graminifolia (flat-topped goldenrod)
Eutrochium (Joe-Pye weeds)
Eutrochium dubium (coastal plain Joe-Pye weed)
Eutrochium fistulosum (tall Joe-pye weed)
Eutrochium maculatum (Spotted Joe Pye Weed)
Eutrochium purpureum (sweet Joe-Pye-weed)
Evolvulus
Evolvulus alsinoides (tropical speedwell)
Evolvulus sericeus (silky evolvulus)
Excoecaria
Excoecaria agallocha (milky mangrove)
Exocarpos
Exocarpos cupressiformis (Cherry Ballart)
Exocarpos latifolius (Broad Leaved Native Cherry)
Exocarpos strictus (Pale-fruit Ballart)
Eysenhardtia
Eysenhardtia texana (Texas Kidneywood)
Fabiana
Fabiana imbricata (Pichi)
Fagopyrum
Fagopyrum esculentum (Common Buckwheat)
Fagus (beeches)
Fagus grandifolia (American Beech)
Fagus sylvatica (European beech)
Fagus sylvatica 'Pendula' (weeping beech)
Fagus sylvatica 'Purpurea Tricolor' (Tricolor Beech)
Fagus sylvatica 'Rohanii' (Rohan Purple Beech)
Fagus sylvatica var. atropurpurea (purple beech)
Fagus sylvatica var. atropurpurea 'Pendula' (weeping copper beech)
Fallopia (Fallopias)
Fallopia baldschuanica (Bukhara Fleeceflower)
Fallopia × bohemica (Bohemian giant knotweed)
Fallopia convolvulus (Black-bindweed)
Fallopia japonica (Japanese knotweed)
Fallopia sachalinensis (giant knotweed)
Fallopia scandens (climbing false buckwheat)
Fallugia
Fallugia paradoxa (Apache plume)
Farfugium
Farfugium japonicum
Farfugium japonicum var. giganteum
Fargesia
Fargesia murielae (Umbrella Bamboo)
Fargesia nitida (Fountain Bamboo)
Fargesia robusta (Robust Bamboo)
Fatoua
Fatoua villosa (hairy crabweed)
× Fatshedera lizei (fatshedera)
Fatsia japonica (fatsia)
Felicia (Felicias)
Ferocactus (barrel cactuses)
Ferocactus cylindraceus (California Barrel Cactus)
Ferocactus wislizeni (fishhook barrel cactus)
Ferula
Ferula communis (giant fennel)
Festuca (Fescues)
Festuca amethystina
Festuca arundinacea (Tall Fescue)
Festuca brevipila (Hard Fescue)
Festuca glauca (blue fescue)
Festuca idahoensis (Idaho fescue)
Festuca roemeri (Roemer's Fescue)
Festuca rubra (Red Fescue)
Ficaria
Ficaria verna (lesser celandine)
Ficinia (Star Grasses)
Ficinia nodosa (Knobby Clubrush)
Ficus (Figs)
Ficus altissima (Council Tree)
Ficus aurea (Florida Strangler Fig)
Ficus benghalensis (Ficus Audrey)
Ficus benjamina (Ficus Benjamina)
Ficus carica (common fig)
Ficus coronata (creek sandpaper fig)
Ficus elastica (Rubber Plant)
Ficus elastica 'Burgundy' (Burgundy Rubber Tree)
Ficus lyrata (fiddle leaf fig)
Ficus maclellandii (Ficus Alii)
Ficus macrophylla (Moreton Bay fig)
Ficus microcarpa (Ficus Ginseng)
Ficus opposita (Sandpaper Fig)
Ficus rubiginosa (Port Jackson fig)
Ficus triangularis (Variegated Ficus Triangularis)
Ficus virens (White fig)
Filago
Filago germanica (Common Cudweed)
Filipendula
Filipendula ulmaria (Meadowsweet)
Filipendula vulgaris (Dropwort)
Fimbristylis (Fringe Rush)
Fimbristylis dichotoma (Common Fringe-rush)
Fissidens (pocket mosses)
Fissidens taxifolius (Common Pocket-moss)
Flagellaria
Flagellaria indica (Indian Bushcane)
Flindersia
Flindersia australis (Crows Ash)
Foeniculum
Foeniculum vulgare (Fennel)
Forestiera
Forestiera pubescens (Downy Forestiera)
Forsythia (Forsythias)
Forsythia × intermedia 'Lynwood Gold' (Lynwood Gold Forsythia)
Forsythia suspensa (Golden-bell)
Forsythia x intermedia (hybrid forsythia)
Fossombronia (Frillworts)
Fothergilla (witch-alders)
Fothergilla gardenii (dwarf fothergilla)
Fouquieria
Fouquieria splendens (ocotillo)
Fragaria (strawberries)
Fragaria chiloensis (Beach Strawberry)
Fragaria 'Lipstick' (lipstick strawberry)
Fragaria vesca (Woodland Strawberry)
Fragaria virginiana (Mountain Strawberry)
Francoa
Francoa sonchifolia (Chilean bridalwreath)
Frangula (False-Buckthorns)
Frangula alnus (alder buckthorn)
Frangula californica (coffeeberry)
Frangula caroliniana (Carolina buckthorn)
Frangula purshiana (cascara)
Frankenia
Frankenia salina (Alkali Heath)
Franklinia
Franklinia alatamaha (franklinia)
Frasera
Frasera speciosa (monument plant)
Fraxinus (ashes)
Fraxinus albicans (Texas ash)
Fraxinus americana (White Ash)
Fraxinus angustifolia (Narrow-leaved Ash)
Fraxinus excelsior f. diversiflora (One-leaved Ash)
Fraxinus latifolia (Oregon ash)
Fraxinus nigra (black ash)
Fraxinus ornus (flowering ash, manna ash)
Fraxinus oxycarpa 'Raywood' (Raywood ash, Flame ash)
Fraxinus velutina (Velvet Ash)
Freesia
Freesia × kewensis
Freesia leichtlinii (Dune Kammetjie)
Fremontodendron
Fremontodendron californicum (California flannelbush)
Fritillaria (Fritillaries)
Fritillaria affinis (Chocolate Lily)
Fritillaria imperialis (crown imperial)
Fritillaria meleagris (snakes-head fritillary)
Fritillaria pudica (yellow fritillary)
Frullania (Scaleworts)
Frullania dilatata (Dilated Scalewort)
Frullania eboracensis (New York Scalewort)
Frullania tamarisci (Tamarisk Scalewort)
Fuchsia (fuchsias)
Fuchsia × hybrida (hybrid fuchsia)
Fuchsia magellanica (hardy fuchsia)
Fuchsia x hybrida (Fuchsia)
Fumaria (Fumitories)
Fumaria capreolata (white ramping-fumitory)
Fumaria muralis (common ramping-fumitory)
Fumaria officinalis (Common Fumitory)
Funaria
Funaria hygrometrica (Bonfire moss)
Funastrum
Funastrum heterophyllum (Hartweg's climbing milkweed)
Furcraea
Gagea
Gahnia (Saw-sedges)
Gahnia aspera (Red-berried Saw-sedge)
Gahnia clarkei (tall saw-sedge)
Gahnia radula (Thatch Saw-sedge)
Gahnia sieberiana (Red-fruit Saw-sedge)
Gaillardia (Blanketflowers)
Gaillardia aristata (blanketflower)
Gaillardia × grandiflora (Hybrid Blanketflower)
Gaillardia pulchella (firewheel)
Gaillardia x grandiflora 'Arizona Sun' (Arizona Sun Gaillardia)
Galactia (Milkpeas)
Galanthus elwesii (Giant Snowdrop)
Galanthus ikariae (Ikarian Snowdrop)
Galanthus nivalis (Common Snowdrop)
Galax
Galax urceolata (galax)
Galearis
Galearis spectabilis (showy orchis)
Galega
Galega officinalis (common milkpea)
Galeopsis (Hempnettles)
Galeopsis bifida (Bifid Hemp-nettle)
Galeopsis tetrahit (Common hemp-nettle)
Galinsoga (galinsogas)
Galinsoga quadriradiata (shaggy soldier)
Galium (bedstraws)
Galium album (white bedstraw)
Galium angustifolium (Narrow-leaved Bedstraw)
Galium aparine (cleavers (native))
Galium boreale (Northern Bedstraw)
Galium circaezans (licorice bedstraw)
Galium mollugo (Hedge Bedstraw)
Galium odoratum (sweet woodruff)
Galium palustre (Common Marsh-bedstraw)
Galium saxatile (Heath Bedstraw)
Galium trifidum (small bedstraw (native))
Galium triflorum (fragrant bedstraw)
Galium verum (Lady's Bedstraw)
Gamochaeta (Everlastings and Cudweeds)
Gamochaeta pensylvanica (Pennsylvania Cudweed)
Gardenia (gardenias)
Gardenia jasminoides (Gardenia)
Garrya (silktassels)
Garrya elliptica (coast silktassel)
Gastrodia
Gastrodia sesamoides (Cinnamon Bells)
Gaudium
Gaudium laevigatum (Coast Teatree)
Gaudium myrsinoides (Heath Teatree)
Gaudium trinervium (Paperbark Tea Tree)
Gaultheria (wintergreens)
Gaultheria hispidula (creeping snowberry)
Gaultheria mucronata (Chilean pernettya)
Gaultheria procumbens (wintergreen)
Gaultheria shallon (salal)
Gaura (Wand Flower)
Gaylussacia (huckleberries)
Gaylussacia baccata (black huckleberry)
Gazania (Treasure Flowers)
Gazania × splendens (Garden Treasure Flower)
Geijera
Geijera parviflora (Wilga)
Geijera salicifolia (Axe Gapper)
Geitonoplesium
Geitonoplesium cymosum (Climbing Lily)
Gelidium (Jellyweeds)
Gelsemium
Gelsemium sempervirens (Carolina Jessamine)
Genista (Brooms)
Genista linifolia (needle-leaved broom)
Genista lydia (Lydia broom)
Genista monspessulana (French broom)
Genista pilosa (silkyleaf woadwaxen)
Genista tinctoria (Dyer's Greenweed)
Gentiana (Gentians)
Gentiana andrewsii (closed bottle gentian)
Gentiana asclepiadea (Willow Gentian)
Gentiana × pallidocyanea (Hybrid Bottle Gentian)
Gentiana sceptrum (King's Scepter Gentian)
Gentianella (dwarf gentians)
Gentianella amarella (autumn gentian)
Geobalanus
Geobalanus oblongifolius (Gopher apple)
Geraea
Geraea canescens (Desert Sunflower)
Geranium caespitosum (pinewoods geranium)
Geranium cantabrigiense (Cambridge Geranium)
Geranium × cantabrigiense 'Karmina' (Karmina Cambridge Cranesbill)
Geranium carolinianum (Carolina crane's-bill)
Geranium dissectum (Cut-leaved crane's-bill)
Geranium endressii (French Crane's-bill)
Geranium 'Gerwat ROZANNE' (Rozanne geranium)
Geranium himalayense 'Baby Blue' (Baby Blue Geranium)
Geranium homeanum (Australasian Crane's-bill)
Geranium 'Johnson's Blue' (Johnson's Blue Geranium)
Geranium lucidum (shiny geranium)
Geranium macrorrhizum (Bigroot Geranium)
Geranium macrorrhizum 'Ingwersen's Variety' (Ingwersen's Variety)
Geranium maculatum (wild geranium)
Geranium maderense
Geranium molle (dovefoot geranium)
Geranium nodosum
Geranium oreganum (Western Geranium)
Geranium 'Patricia' (Patricia Geranium)
Geranium phaeum 'Samobor' (Samobor Geranium)
Geranium potentilloides (cinquefoil geranium)
Geranium pratense (Meadow Crane's-bill)
Geranium psilostemon (magenta cranesbill)
Geranium pusillum (Small-flowered Crane's-bill)
Geranium pyrenaicum (Hedgerow Crane's-bill)
Geranium richardsonii (Richardson's geranium)
Geranium robertianum (herb-Robert, stinky Bob)
Geranium rotundifolium (Roundleaf geranium)
Geranium × 'Rozanne' (Rozanne Cranesbill)
Geranium sanguineum (Bloody Crane's-bill)
Geranium sanguineum 'Album'
Geranium solanderi (Solander's geranium)
Geranium sylvaticum (wood crane's-bill)
Geranium tuberosum (Tuberous Geranium)
Geranium viscosissimum (sticky geranium)
Geranium wallichianum (Purple-vein geranium)
Geranium wlassovianum (Wlassov's Geranium)
Gerbera (Gerbera Daisies)
Geum (avens)
Geum canadense (white avens)
Geum macrophyllum (large-leaved avens)
Geum rivale (Water Avens)
Geum ssp. 'Cocktail Collection' (avens)
Geum triflorum (Prairie Smoke)
Geum urbanum (Wood Avens)
Geum vernum (Spring Avens)
Gilia (Gilias)
Gilia capitata (bluehead gilia)
Gilia tricolor (bird's-eye gilia)
Ginkgo
Ginkgo biloba (ginkgo, maidenhair tree)
Ginkgo biloba 'Autumn Gold' (Autumn Gold Ginkgo)
Ginkgo biloba 'Jade Butterflies' (Jade Butterflies Ginkgo Tree)
Ginkgo biloba 'Mariken' (Ginkgo Biloba Mariken Tree)
Ginkgo biloba 'PNI 2720' (ginkgo)
Ginkgo biloba 'Princeton Sentry' (Princeton Sentry Columnar Ginkgo)
Gladiolus (Gladioli)
Gladiolus communis (Gladiolus)
Gladiolus communis ssp. byzantinus (Eastern Gladiolus)
Gladiolus × hortulanus (Large-flowered Gladiolus)
Gladiolus Hybrids (hardy gladiolus)
Gladiolus murielae (fragrant gladiolus)
Glandora
Glandora diffusa (lithodora)
Glandularia (mock vervains)
Glandularia aristigera (South American mock vervain)
Glandularia bipinnatifida (Dakota mock vervain)
Glandularia canadensis (rose vervain)
Glandularia × hybrida (garden verbena)
Glaucium
Glaucium flavum (Yellow Horned Poppy)
Glebionis
Glebionis coronaria (Garland Daisy)
Glebionis segetum (Corn Marigold)
Glechoma (ground-ivies)
Glechoma hederacea (ground-ivy)
Gleditsia (honey locusts)
Gleditsia triacanthos (honey locust)
Gleichenia
Gleichenia dicarpa (Pouched Coral Fern)
Gleichenia microphylla (scrambling coral-fern)
Glischrocaryon
Glischrocaryon behrii (golden pennants)
Glochidion
Glochidion ferdinandi (Cheese Tree)
Glossodia
Glossodia major (Waxlip Orchid)
Glossodia minor (Small Waxlip Orchid)
Glyceria (Sweet Grasses)
Glyceria borealis (northern mannagrass)
Glyceria elata (tall mannagrass)
Glyceria fluitans (water manna grass)
Glyceria grandis (American Manna Grass)
Glyceria maxima (reed meadowgrass)
Glycine (Soybeans)
Glycine clandestina (Twining Glycine)
Glycine tabacina (Glycine Pea)
Glycyrrhiza
Glycyrrhiza lepidota (Wild Licorice)
Gnaphalium
Gnaphalium uliginosum (marsh cudweed)
Goeppertia
Goeppertia insignis (Rattlesnake Plant)
Goeppertia kegeljanii (Calathea Musaica)
Goeppertia makoyana (Peacock Plant)
Goeppertia orbifolia (Round-Leaved Calathea)
Goeppertia ornata (Pinstripe Calathea)
Gomphocarpus
Gomphocarpus fruticosus (Narrow-leaf Cotton Bush)
Gomphocarpus physocarpus (balloonplant)
Gompholobium
Gompholobium grandiflorum (Large Wedge Pea)
Gompholobium huegelii (Common Wedge-pea)
Gompholobium latifolium (Golden Glory Pea)
Gomphrena
Gomphrena celosioides (prostrate globe-amaranth)
Gomphrena globosa (Globe Amaranth)
Gonocarpus
Gonocarpus micranthus (creeping raspwort)
Gonocarpus tetragynus (Common Raspwort)
Gonocarpus teucrioides (Raspwort)
Gonolobus
Gonolobus suberosus (Anglepod)
Goodenia (goodenias)
Goodenia bellidifolia (Daisy-leaved Goodenia)
Goodenia blackiana (Black's goodenia)
Goodenia geniculata (Bent Goodenia)
Goodenia hederacea (Ivy Goodenia)
Goodenia heterophylla (Variable-leaved Goodenia)
Goodenia lanata (trailing Goodenia)
Goodenia mystrophylla (wild pansies)
Goodenia ovata (hop goodenia)
Goodenia pinnatifida (scrambled eggs)
Goodenia rotundifolia (Star Goodenia)
Goodia
Goodia lotifolia (Clover-leaved Poison)
Goodyera
Goodyera oblongifolia (Rattlesnake Plantain)
Goodyera pubescens (downy rattlesnake plantain)
Gossia
Gossia bidwillii (Python Tree)
Gossypium (Cottons)
Gratiola
Gratiola peruviana (Austral Brooklime)
Grevillea (Grevilleas)
Grevillea alpina (Mountain Grevillea)
Grevillea aquifolium (variable prickly grevillea)
Grevillea banksii (Scarlet Grevillea)
Grevillea buxifolia (Grey Spider Flower)
Grevillea 'Canberra Gem'
Grevillea crithmifolia
Grevillea juniperina
Grevillea lavandulacea (Lavender Grevillea)
Grevillea linearifolia (White Spider Flower)
Grevillea mucronulata (Green Spider Flower)
Grevillea robusta (silk oak)
Grevillea rosmarinifolia (rosemary grevillea)
Grevillea sericea (Pink Spider Flower)
Grevillea speciosa (Red Spider Flower)
Grevillea victoriae (Royal Grevillea)
Grewia (Donkeyberries)
Grimmia
Grimmia laevigata (Grimmia Dry Rock Moss)
Grimmia pulvinata (Grey-cushioned Grimmia)
Grindelia (gumplants)
Grindelia camporum (Great Valley gumweed)
Grindelia ciliata (Spanish Gold)
Grindelia integrifolia (Puget Sound Gumweed)
Grindelia squarrosa (Curlycup Gumweed)
Grindelia stricta (Oregon Gumplant)
Guioa
Guioa semiglauca (Guioa)
Gunnera (Gunneras)
Gunnera manicata (gunnera)
Gutierrezia (matchweeds and snakeweeds)
Gutierrezia sarothrae (Broom Snakeweed)
Guzmania (Guzmania)
Guzmania lingulata (Scarlet Star)
Gymnadenia
Gymnadenia conopsea (Fragrant Orchid)
Gymnocalycium
Gymnocalycium mihanovichii (Moon Cactus)
Gymnocarpium (oak ferns)
Gymnocarpium disjunctum (oak fern)
Gymnocarpium dryopteris (Northern Oak Fern)
Gymnocladus
Gymnocladus dioicus (Kentucky coffee tree)
Gymnostachys
Gymnostachys anceps (settler's flax)
Gynatrix
Gynatrix pulchella (Hemp Bush)
Gynochthodes
Gynochthodes jasminoides (sweet morinda)
Gynura
Gynura aurantiaca (Purple Passion Plant)
Gypsophila
Gypsophila repens 'Rosea'
Gypsophila 'Rosenschleier'
Hackelia (Stickseeds)
Hackelia latifolia (Forest Hound’s-tongue)
Hackelia suaveolens (sweet hound's-tongue)
Hackelia virginiana (virginia stickseed)
Hacquetia
Hacquetia epipactis (hacqetia)
Hakea (Pincushion trees)
Hakea dactyloides (finger hakea)
Hakea decurrens (Bushy Needlewood)
Hakea laurina (Pincushion hakea)
Hakea lissocarpha (Honey Bush)
Hakea lissosperma (Mountain Needlewood)
Hakea mitchellii (desert Hakea)
Hakea prostrata (Harsh Hakea)
Hakea rostrata (Beaked Hakea)
Hakea salicifolia (Willow-leaved hakea)
Hakea sericea (Bushy needlebush)
Hakea teretifolia (Dagger Hakea)
Hakea ulicina (Furze Hakea)
Hakonechloa
Hakonechloa macra (Hakone grass)
Hakonechloa macra 'All Gold' (All Gold Hakone Grass)
Hakonechloa macra 'Aureola' (Japanese Forest Grass)
Halesia (silverbells)
Halesia carolina (Carolina silverbell)
Hamamelis (witch-hazels)
Hamamelis mollis (Chinese witch hazel)
Hamamelis virginiana (Common Witch Hazel)
Hamamelis x intermedia (hybrid witch hazel)
Hamelia
Hamelia patens (Firebush)
Handroanthus
Handroanthus chrysotrichus (Golden Trumpet Tree)
Handroanthus impetiginosus (Pink Trumpet Tree)
Hardenbergia
Hardenbergia comptoniana (Native wisteria)
Hardenbergia violacea (False Sarsaparilla)
Harpullia
Harpullia pendula (Black Tulip)
Haworthiopsis (Sixsided Haworthias)
Hazardia
Hazardia squarrosa (saw-toothed goldenbush)
Hedera (ivies)
Hedera helix (English Ivy)
Hedera helix 'Arborescens'
Hedera hibernica (Atlantic or Irish ivy)
Hedwigia (Hoarmosses)
Hedwigia ciliata (Ciliate Hoarmoss)
Hedycarya
Hedycarya angustifolia (Australian mulberry)
Hedychium (Garland lillies)
Hedychium gardnerianum (Kahili ginger)
Hedypnois
Hedypnois rhagadioloides (Cretanweed)
Helenium (sneezeweeds)
Helenium amarum (Bitterweed)
Helenium autumnale (Sneezeweed)
Helenium flexuosum (Southern Sneezeweed)
Helenium 'Moerheim Beauty' (Moerheim Beauty Sneezeweed)
Helenium spp. (sneezeweed)
Helianthemum nummularium 'Cerise Queen' (Cerise Queen Sun Rose)
Helianthemum nummularium 'Fire Dragon' (Fire Dragon Sun Rose)
Helianthus angustifolius (Swamp Sunflower)
Helianthus annuus (Common Sunflower)
Helianthus debilis (cucumberleaf sunflower)
Helianthus divaricatus (woodland sunflower)
Helianthus grosseserratus (sawtooth sunflower)
Helianthus hirsutus (stiff-hair sunflower)
Helianthus maximiliani (Maximilian Perennial Sunflower)
Helianthus mollis (ashy sunflower)
Helianthus petiolaris (prairie sunflower)
Helianthus strumosus (pale-leaved woodland sunflower)
Helianthus tuberosus (Jerusalem artichoke)
Helichrysum (Everlasting-flowers)
Helichrysum leucopsideum (Satin Everlasting)
Heliconia (Heliconias)
Heliconia rostrata (Hanging Lobster Claw)
Helictotrichon
Helictotrichon sempervirens (blue oat grass)
Heliomeris
Heliomeris multiflora (showy goldeneye)
Heliopsis (Oxeyes)
Heliopsis helianthoides var. scabra 'Summer Sun' (Summer Sun False Sunflower)
Heliotropium (Heliotropes)
Heliotropium amplexicaule (fragrant heliotrope)
Heliotropium curassavicum (alkali heliotrope)
Heliotropium indicum (Indian Heliotrope)
Helleborus (Hellebores)
Helleborus argutifolius (Corsican hellebore)
Helleborus atrorubens (dark red hellebore)
Helleborus foetidus (Stinking hellebore)
Helleborus orientalis (Lenten Rose)
Helleborus sternii (Stern's Hellebore)
Helleborus x hybridus (hybrid hellebore)
Helminthotheca
Helminthotheca echioides (bristly oxtongue)
Helosciadium
Helosciadium nodiflorum (Fool's Watercress)
Hemerocallis (daylilies)
Hemerocallis 'Bela Lugosi' (Bela Lugosi Daylily)
Hemerocallis 'Black Ambrosia' (Black Ambrosia Daylily)
Hemerocallis 'Buttered Popcorn' (Buttered Popcorn Daylily)
Hemerocallis 'Canadian Border Patrol' (Canadian Border Patrol Daylily)
Hemerocallis 'Custard Candy' (Custard Candy Daylily)
Hemerocallis 'Earlybird Cardinal' (Earlybird Cardinal Daylily)
Hemerocallis 'Ed Brown' (Ed Brown Daylily)
Hemerocallis 'Ed Murray' (Ed Murray Daylily)
Hemerocallis 'El Desperado' (El Desperado Daylily)
Hemerocallis 'Elegant Candy' (Elegant Candy Daylily)
Hemerocallis 'Fooled Me' (Fooled Me Daylily)
Hemerocallis 'French Lingerie' (French Lingerie Daylily)
Hemerocallis × 'Happy Returns' (Happy Returns Daylily)
Hemerocallis Hybrids (daylily)
Hemerocallis 'Janice Brown' (Janice Brown Daylily)
Hemerocallis 'Jolyene Nichole' (Jolyene Nichole Daylily)
Hemerocallis lilioasphodelus (yellow daylily)
Hemerocallis 'Moonlit Masquerade' (Moonlit Masquerade Daylily)
Hemerocallis 'Night Whispers' (Night Whispers Daylily)
Hemerocallis 'Prairie Blue Eyes' (Prairie Blue Eyes Daylily)
Hemerocallis 'Primal Scream' (Primal Scream Daylily)
Hemerocallis 'Purple de Oro' (Purple de Oro Daylily)
Hemerocallis 'Siloam Double Classic' (Siloam Double Classic)
Hemerocallis 'Singular Sensation' (Singular Sensation Daylily)
Hemerocallis × 'Stella de Oro' (Stella de Oro Daylily)
Hemerocallis 'Strawberry Candy' (Strawberry Candy Daylily)
Hemerocallis 'Wineberry Candy' (Wineberry Candy Jumbo Daylily)
Hemizonia
Hemizonia congesta (Hayfield Tarweed)
Hepatica acutiloba (sharp-lobed hepatica)
Hepatica americana (round-lobed hepatica)
Heptapleurum (umbrella trees)
Heptapleurum actinophyllum (Australian Umbrella Tree)
Heptapleurum arboricola (Miniature umbrella tree)
Heptapleurum delavayi
Heracleum (hogweeds)
Heracleum mantegazzianum (giant hogweed)
Heracleum maximum (cow-parsnip)
Heracleum sphondylium (hogweed)
Herbertia
Herbertia lahue (Prairie Nymph)
Hermannia (Dollsroses)
Hesperaloe
Hesperaloe parviflora (Red Yucca)
Hesperis
Hesperis matronalis (dame's rocket)
Hesperocallis
Hesperocallis undulata (desert lily)
Hesperocyparis (western cypresses)
Hesperocyparis arizonica (Arizona Cypress)
×Hesperocyparis leylandii (Leyland cypress)
Hesperocyparis macrocarpa 'Goldcrest' (Goldcrest Monterey Cypress)
Hesperoyucca
Hesperoyucca whipplei (chaparral yucca)
Heteromeles
Heteromeles arbutifolia (Toyon)
Heterotheca (False Goldenasters)
Heterotheca grandiflora (Telegraphweed)
Heterotheca subaxillaris (Camphorweed)
Heterotheca villosa (Hairy Gold Aster)
Heuchera (alumroots)
Heuchera 'Amber Waves' (Amber Waves Coral Bells)
Heuchera americana (American Alumroot)
Heuchera chlorantha (Tall Alumroot)
Heuchera cylindrica (Round-Leaf Alumroot)
Heuchera 'Marmalade' (Marmalade Coral Bells)
Heuchera micrantha (native heuchera)
Heuchera micrantha (small-flowered alumroot)
Heuchera × 'Obsidian' (Obsidian Heuchera)
Heuchera spp. (coral bells)
Heuchera villosa 'Autumn Bride' (Autumn Bride Heuchera)
Heuchera villosa 'Caramel' (Caramel Heuchera)
Heucherella
× Heucherella 'Kimono' (Kimono Foamy Bells)
Heucherella × 'Sweet Tea' (Sweet Tea Foamy Bells)
Hexasepalum
Hexasepalum teres (rough buttonweed)
Hibbertia (guinea-flowers)
Hibbertia aspera (Rough Guinea Flower)
Hibbertia crinita (Long-hair Guinea-flower)
Hibbertia cuneiformis (Cutleaf Hibbertia)
Hibbertia dentata (Toothed Guinea Flower)
Hibbertia devitata (Smooth Guinea-flower)
Hibbertia exutiacies (Prickly Guinea-flower)
Hibbertia fasciculata (bundled hibbertia)
Hibbertia hypericoides (Yellow Buttercups)
Hibbertia linearis (Showy Guinea Flower)
Hibbertia obtusifolia (grey guinea flower)
Hibbertia riparia (Erect Guinea-flower)
Hibbertia scandens (Climbing Guinea flower)
Hibbertia sericea (Silky Guinea-flower)
Hibbertia vestita (Hairy Guinea-flower)
Hibbertia virgata (Twiggy Guinea-flower)
Hibiscus (hibiscuses)
Hibiscus × archeri (Red Hibiscus)
Hibiscus coccineus (Scarlet Rose Mallow)
Hibiscus denudatus (Rock Hibiscus)
Hibiscus heterophyllus (Rosella)
Hibiscus laevis (Halberd-leaf Rosemallow)
Hibiscus moscheutos (Hardy Hibiscus)
Hibiscus rosa-sinensis (Tropical Hibiscus)
Hibiscus rosa-sinensis 'Painted Lady' (Painted Lady Hibiscus Bush)
Hibiscus syriacus (Rose of Sharon)
Hibiscus syriacus 'Aphrodite' (Aphrodite Rose of Sharon)
Hibiscus syriacus 'Ardens' (Ardens Rose of Sharon)
Hibiscus syriacus 'Diana' (Diana Rose of Sharon)
Hibiscus syriacus 'Oiseau Bleu' (Bluebird Rose of Sharon)
Hibiscus syriacus 'Woodbridge' (Pink Rose of Sharon)
Hibiscus tiliaceus (sea hibiscus)
Hibiscus trionum (flower-of-an-hour)
Hieracium (hawkweeds)
Hieracium albiflorum (white hawkweed)
Hieracium aurantiacum (orange hawkweed)
Hieracium umbellatum (Canada hawkweed)
Hieracium venosum (rattlesnakeweed)
Hippeastrum (Amaryllis)
Hippeastrum × johnsonii (St Joseph's Lily)
Hippocrepis
Hippocrepis comosa (horseshoe vetch)
Hippophae
Hippophae rhamnoides (Sea-buckthorn)
Hippuris
Hippuris vulgaris (Common Mare's Tail)
Hirschfeldia
Hirschfeldia incana (Shortpod Mustard)
Histiopteris
Histiopteris incisa (Water Fern)
Holcus
Holcus lanatus (common velvet-grass)
Holcus mollis (creeping velvet grass)
Holodiscus
Holodiscus discolor (ocean spray)
Homalanthus
Homalanthus populifolius (Bleeding Heart)
Homalocephala
Homalocephala texensis (Horse Crippler Cactus)
Homalothecium (homalothecium mosses)
Homalothecium sericeum (Silky Wall Feather-moss)
Honckenya
Honckenya peploides (Sea Sandwort)
Hookeria
Hookeria lucens (Shining Hookeria)
Hordeum (Barleys)
Hordeum brachyantherum (Meadow Barley)
Hordeum jubatum (foxtail barley)
Hordeum murinum (wall barley)
Hordeum pusillum (little barley)
Hordeum vulgare (Common Barley)
Hosta (hostas)
Hosta × 'Abiqua Drinking Gourd' (Abiqua Drinking Gourd Hosta)
Hosta 'Blue Angel' (Blue Angel Hosta)
Hosta 'Blue Mouse Ears' (Blue Mouse Ears Hosta)
Hosta 'Bressingham Blue' (Hosta Bressingham Blue)
Hosta 'Empress Wu' (Empress Wu Hosta)
Hosta 'Francee' (Francee Hosta)
Hosta × 'Great Expectations' (Great Expectations Hosta)
Hosta 'Guacamole' (Guacamole Hosta)
Hosta × 'Halcyon' (Halcyon Hosta)
Hosta Hybrids (hosta)
Hosta 'June' (June Hosta)
Hosta × 'Liberty' (Liberty Hosta)
Hosta 'Patriot' (Patriot Hosta)
Hosta 'Purple Heart'
Hosta × 'Spartacus' (Spartacus Hosta)
Hosta spp. (Hosta Verdant Medley Collection)
Hosta 'Stained Glass' (Stained Glass Hosta)
Hosta 'Sum and Substance' (Sum and Substance Hosta)
Hottonia
Hottonia palustris (Water Violet)
Houstonia (flowering bluets)
Houstonia caerulea (azure bluet)
Houstonia longifolia (long-leaved bluets)
Houstonia purpurea (summer bluet)
Houstonia pusilla (tiny bluet)
Houttuynia
Houttuynia cordata (Chameleon Plant)
Hovea
Hovea acutifolia (Purple Bush Pea)
Hovea heterophylla (common hovea)
Hoya (Wax plants)
Hoya australis (common waxflower)
Hoya carnosa 'Compacta' (Hindu Rope Plant)
Hoya heuschkeliana (variegated) (Hoya Heuschkeliana Variegated)
Hoya kerrii (Sweetheart Hoya)
Hoya meredithii (Hoya Meredithii)
Hoya multiflora (variegated) (Variegated Hoya Multiflora)
Hoya pubicalyx (Wax Plant)
Humulus (Hops)
Humulus lupulus 'Aureus' (Golden Hop)
Humulus scandens (Japanese Hops)
Huperzia (temperate firmosses)
Huperzia lucidula (shining firmoss)
Huperzia selago (northern firmoss)
Hyacinthoides (Bluebells)
Hyacinthoides hispanica (Spanish bluebells)
Hyacinthoides × massartiana (Hybrid bluebell)
Hyacinthoides non-scripta (bluebell)
Hyacinthus (Hyacinths)
Hyacinthus orientalis (hyacinth)
Hydrangea (hydrangeas)
Hydrangea anomala ssp. petiolaris (Climbing Hydrangea)
Hydrangea anomala ssp. petiolaris (climbing hydrangea)
Hydrangea anomala subsp. petiolaris (Climbing Hydrangea)
Hydrangea arborescens 'Abetwo' (Incrediball Hydrangea)
Hydrangea arborescens 'Annabelle' (Annabelle Hydrangea)
Hydrangea integrifolia (evergreen climbing hydrangea)
Hydrangea macrophylla (bigleaf hydrangea)
Hydrangea macrophylla 'Ayesha' (Ayesha Hydrangea)
Hydrangea macrophylla 'Bailmer' (Endless Summer Hydrangea)
Hydrangea macrophylla 'Blaumeise' (Blue Tit Hydrangea)
Hydrangea macrophylla 'Blushing Bride' (Blushing Bride Hydrangea)
Hydrangea macrophylla 'Endless Summer' (Endless Summer Hydrangea)
Hydrangea macrophylla 'Izu-no-hana' (Izu-no-hana Hydrangea)
Hydrangea macrophylla 'Mariesii' (Mariesii Hydrangea)
Hydrangea macrophylla 'Mariesii Lilacina' (Lilacina Lacecap Hydrangea)
Hydrangea macrophylla 'Merritt's Supreme' (Merritt's Supreme Hydrangea)
Hydrangea macrophylla 'Nikko Blue' (Nikko Blue Hydrangea)
Hydrangea macrophylla 'Pia' (Pia Hydrangea)
Hydrangea paniculata 'Grandiflora' (pee-gee hydrangea)
Hydrangea paniculata 'Jane' (Little Lime Hydrangea)
Hydrangea paniculata 'Limelight' (Limelight Peegee Hydrangea)
Hydrangea paniculata 'Renhy' (Vanilla Strawberry Hydrangea Tree)
Hydrangea paniculata 'Tardiva' (Tardiva Hydrangea)
Hydrangea petiolaris (climbing hydrangea)
Hydrangea quercifolia (oak-leaf hydrangea)
Hydrangea quercifolia 'Alice' (Alice Oakleaf Hydrangea)
Hydrangea quercifolia 'Pee Wee' (Pee Wee Oakleaf Hydrangea)
Hydrangea quercifolia 'Snow Queen' (Snow Queen Oakleaf Hydrangea)
Hydrangea serrata 'Blue Billow' (Blue Billow Hydrangea)
Hydrangea serrata 'Grayswood' (Grayswood Hydrangea)
Hydrangea serrata 'Preziosa' (Preziosa Hydrangea)
Hydrastis
Hydrastis canadensis (Goldenseal)
Hydrilla
Hydrilla verticillata (hydrilla)
Hydrocharis
Hydrocharis morsus-ranae (European Frog-bit)
Hydrocotyle (water pennyworts)
Hydrocotyle bonariensis (largeleaf pennywort)
Hydrocotyle hirta (Hairy Pennywort)
Hydrocotyle laxiflora (Stinking Pennywort)
Hydrocotyle novae-zeelandiae
Hydrocotyle ranunculoides (floating marsh pennywort)
Hydrocotyle umbellata (manyflower marshpennywort)
Hydrocotyle vulgaris (Marsh Pennywort)
Hydrophyllum (Waterleaves)
Hydrophyllum appendiculatum (great waterleaf)
Hydrophyllum canadense (Broad-leaf Waterleaf)
Hydrophyllum capitatum (ballhead waterleaf)
Hydrophyllum macrophyllum (Large-leaf water leaf)
Hydrophyllum tenuipes (Pacific waterleaf)
Hydrophyllum virginianum (Virginia waterleaf)
Hylocereus
Hylocereus undatus (Dragon Fruit)
Hylocomiadelphus
Hylocomiadelphus triquetrus (rough goose neck moss)
Hylocomium
Hylocomium splendens (stairstep moss)
Hylodesmum
Hylodesmum glutinosum (pointed-leaved tick-trefoil)
Hylodesmum nudiflorum (naked-flowered tick-trefoil)
Hylotelephium (Live-forever)
Hylotelephium 'Herbstfreude' (Autumn Joy Sedum)
Hylotelephium × mottramianum (Autumn Joy)
Hylotelephium telephium (Orpine)
Hymenocallis (spider lilies)
Hymenopappus (Woollywhites)
Hymenopappus scabiosaeus (Carolina Woollywhite)
Hymenophyllum (filmy ferns)
Hymenophyllum cupressiforme (Common Filmy-fern)
Hymenosporum
Hymenosporum flavum (Australian frangipani)
Hyophorbe
Hyophorbe lagenicaulis (Bottle Palm)
Hypericum (St. John's worts)
Hypericum androsaemum (Tutsan)
Hypericum calycinum (St. John's wort)
Hypericum elodes (Marsh St John's-wort)
Hypericum gentianoides (pineweed)
Hypericum gramineum (Small St John's Wort)
Hypericum hirsutum (Hairy St John's-wort)
Hypericum humifusum (Trailing St John's-wort)
Hypericum Hybrids (hybrid hypericum)
Hypericum hypericoides (St. Andrew's cross)
Hypericum kalmianum (Kalm St. John's Wort)
Hypericum maculatum (Imperforate St John's-wort)
Hypericum mutilum (Dwarf St. John's Wort)
Hypericum perforatum (common St. Johnswort)
Hypericum prolificum (shrubby St. John's-wort)
Hypericum pulchrum (Slender St John's-wort)
Hypericum punctatum (spotted St. John's wort)
Hypericum stragulum (low St. John's wort)
Hypericum tetrapetalum (fourpetal St. Johnswort)
Hypericum tetrapterum (Square Stemmed Saint John's Wort)
Hypnum
Hypnum andoi (mamillate plait-moss)
Hypnum cupressiforme (Cypress-leaved Plait-moss)
Hypnum jutlandicum (Heath Plait-moss)
Hypocalymma
Hypocalymma angustifolium (White Myrtle)
Hypochaeris (Cat's-Ears)
Hypochaeris glabra (Smooth Cat's Ear)
Hypochaeris radicata (hairy cat's-ear)
Hypoestes
Hypoestes phyllostachya (Polka Dot Plant)
Hypolaena
Hypolaena fastigiata (Tassel Rope-rush)
Hypolepis
Hypolepis muelleri (Harsh Ground-fern)
Hypoxis (Stargrasses)
Hypoxis hirsuta (yellow star grass)
Hypoxis hygrometrica (Golden Weather-grass)
Hyptis
Hyptis alata (Musky mint)
Hyssopus
Hyssopus officinalis ssp. aristatus (Dwarf Hyssop)
Hysterobaeckea
Hysterobaeckea behrii (Broom Baeckea)
Iberis (Candytufts)
Iberis saxatilis (rock candytuft)
Iberis sempervirens (candytuft)
Iberis spathulata (Pyrenean Candytuft)
Ilex (hollies)
Ilex aquifolium (English holly)
Ilex aquifolium 'Ferox Argentea' (variegated porcupine holly)
Ilex × attenuata (savannah holly)
Ilex cassine (dahoon holly)
Ilex cornuta (Chinese holly)
Ilex crenata (Japanese holly)
Ilex decidua (possumhaw)
Ilex glabra (gallberry)
Ilex meserveae (Meserve Holly)
Ilex mucronata (Mountain holly)
Ilex × 'Nellie R. Stevens' (Nellie R. Stevens Holly)
Ilex opaca (American Holly)
Ilex verticillata (common winterberry)
Ilex x meserveae (blue-leaved hybrid holly)
Iliamna
Iliamna rivularis (Streambank Globemallow)
Impatiens capensis (spotted jewelweed)
Impatiens glandulifera (policeman's helmet)
Impatiens hawkeri (New Guinea Impatiens)
Impatiens omeiana (Golden Impatiens)
Impatiens pallida (pale jewelweed)
Impatiens parviflora (small balsam)
Impatiens walleriana (bedding impatiens)
Indigofera (Indigos)
Indigofera australis (Australian Indigo)
Indigofera miniata (Scarlet Pea)
Inga
Inga edulis (Ice Cream Bean)
Ipheion
Ipheion uniflorum 'Wisley Blue' (Wisley Blue Spring Starflower)
Ipomoea batatas 'Beauregard' (Beauregard Sweet Potato)
Ipomoea cairica (Mile-a-minute vine)
Ipomoea cordatotriloba (Tievine)
Ipomoea hederacea (ivy-leaved morning-glory)
Ipomoea imperati (beach morning-glory)
Ipomoea indica (oceanblue morning glory)
Ipomoea lacunosa (White Morning-glory)
Ipomoea × multifida (Cardinal Climber)
Ipomoea pandurata (wild potato vine)
Ipomoea pes-caprae (Beach Morning Glory)
Ipomoea purpurea (common morning-glory)
Ipomoea sagittata (Saltmarsh Morning-glory)
Ipomopsis (Skyrockets)
Ipomopsis aggregata (Scarlet Gilia)
Ipomopsis rubra (standing cypress)
Iresine (bloodleaves)
Iris (Irises)
Iris domestica (Blackberry Lily)
Iris ensata (Japanese iris)
Iris ensata 'Cascade Spice' (Cascade Spice Japanese Iris)
Iris florentina (Florentine iris)
Iris × germanica (Bearded iris)
Iris germanica
Iris germanica 'Autumn Circus' (Autumn Circus Reblooming Bearded Iris)
Iris germanica 'Beverly Sills' (Beverly Sills Reblooming Iris)
Iris germanica 'Blatant' (Blatant Reblooming Iris)
Iris germanica 'Brilliant Idea' (Brilliant Idea Bearded Iris)
Iris germanica 'Champagne Elegance' (Champagne Elegance Reblooming Iris)
Iris germanica 'City Lights' (City Lights Reblooming Iris)
Iris germanica 'Harvest of Memories' (Harvest of Memories Reblooming Iris)
Iris germanica 'Immortality' (Immortality Reblooming Bearded Iris)
Iris germanica 'Oreo' (Oreo Bearded Iris)
Iris germanica 'Rosalie Figge' (Rosalie Figge Reblooming Iris)
Iris germanica 'Social Graces' (Social Graces Bearded Iris)
Iris germanica 'Superstition' (Superstition Bearded Iris)
Iris germanica 'Tiger Honey' (Tiger Honey Bearded Iris)
Iris germanica 'Victoria Falls' (Victoria Falls Reblooming Iris)
Iris × hollandica (Dutch iris)
Iris × hybrida
Iris 'Kent Pride'
Iris laevigata
Iris louisiana 'Black Gamecock' (Black Gamecock Louisiana Iris)
Iris macrosiphon (Bowltube Iris)
Iris missouriensis (Western Blue Flag Iris)
Iris pallida 'Variegata' (Variegated Sweet Iris)
Iris paradoxa (paradoxical iris)
Iris pseudacorus (Yellow Iris)
Iris setosa (Beachhead Iris)
Iris sibirica (Siberian iris)
Iris 'Superstition'
Iris tenax (Oregon Flag Iris)
Iris × thompsonii
Iris tuberosa
Iris versicolor (northern blue flag)
Iris virginica (Virginia Iris)
Isatis
Isatis tinctoria
Isocoma
Isocoma menziesii (Coastal Goldenbush)
Isolepis
Isolepis cernua
Isopogon
Isopogon anemonifolius (Broad-leaved Drumsticks)
Isopogon anethifolius (Narrow-leaf Drumsticks)
Isopogon ceratophyllus (Horny Cone-bush)
Itea
Itea virginica (Virginia sweetspire)
Iva
Iva annua (Sumpweed)
Iva frutescens (marsh elder)
Ixia (Corn lilies)
Ixodia
Ixodia achillaeoides (sand ixodia)
Ixora (ixoras)
Ixora coccinea (Jungle flame)
Jacaranda (jacarandas)
Jacaranda mimosifolia (Jacaranda)
Jacksonia
Jacksonia scoparia (winged broom-pea)
Jacobaea (ragworts)
Jacobaea aquatica (Marsh Ragwort)
Jacobaea erucifolia (Hoary Ragwort)
Jacobaea maritima (dusty miller)
Jacobaea vulgaris (tansy ragwort)
Jagera
Jagera pseudorhus (Fern Top)
Jasione
Jasione montana (Sheep's Bit Scabious)
Jasminum (jasmine)
Jasminum nudiflorum (winter jasmine)
Jasminum polyanthum (Pink Jasmine)
Jasminum stephanense (Pink Jasmine)
Jatropha (Physic Nuts)
Jeffersonia
Jeffersonia diphylla (twinleaf)
Johnstonella
Johnstonella angustifolia (narrow-leaved cryptantha)
Juglans (Walnuts)
Juglans californica (California Black Walnut)
Juglans cinerea (Butternut)
Juglans hindsii (northern California black walnut)
Juglans nigra (black walnut)
Juglans regia (English walnut)
Juncus (Rushes)
Juncus acuminatus (Knotty-leaf Rush)
Juncus acutiflorus (Sharp-flowered Rush)
Juncus articulatus (jointed rush)
Juncus balticus (Baltic Rush)
Juncus bufonius (Toad rush)
Juncus conglomeratus (Compact Rush)
Juncus effusus (soft rush)
Juncus ensifolius (dagger-leaf rush)
Juncus kraussii (Sea Rush)
Juncus pallidus (Great Soft-rush)
Juncus patens (Spreading Rush)
Juncus squarrosus (heath rush)
Juncus tenuis (Path Rush)
Juncus usitatus (australian rush)
Juniperus (junipers)
Juniperus ashei (Ashe juniper)
Juniperus californica (California Juniper)
Juniperus chinensis 'Blue Point' (Blue Point Juniper)
Juniperus chinensis 'Kaizuka' (Hollywood Juniper)
Juniperus communis (common juniper)
Juniperus communis 'Gold Cone' (Gold Cone Juniper)
Juniperus conferta (shore juniper)
Juniperus conferta 'Blue Pacific' (Blue Pacific Shore Juniper)
Juniperus conferta 'Silver Mist' (Silver Mist Shore Juniper)
Juniperus deppeana (alligator juniper)
Juniperus grandis (Sierra juniper)
Juniperus horizontalis (creeping juniper)
Juniperus horizontalis 'Lime Glow' (Lime Glow Juniper)
Juniperus horizontalis 'Wiltonii' (Blue Rug Juniper)
Juniperus monosperma (One-seed Juniper)
Juniperus osteosperma (Utah Juniper)
Juniperus procumbens 'Nana' (Dwarf Japanese Garden Juniper)
Juniperus sabina 'Tamariscifolia' (Tam Juniper)
Juniperus scopulorum (Rocky Mountain Juniper)
Juniperus squamata 'Blue Carpet' (Blue Carpet Singleseed Juniper)
Juniperus squamata 'Blue Star' (Blue Star Juniper)
Juniperus virginiana 'Brodie' (Brodie Eastern Red Cedar)
Justicia
Justicia americana (American water-willow)
Justicia californica (chuparosa)
Justicia fulvicoma (Orange Shrimp Plant)
Justicia pilosella (Gregg's tube tongue)
Kalanchoe (Kalanchoes)
Kalanchoe blossfeldiana (Flaming Katy)
Kalanchoe delagoensis (Mother of Millions)
Kalanchoe × houghtonii (Alligator plant)
Kalmia
Kalmia angustifolia (sheep laurel)
Kalmia latifolia (mountain laurel)
Kalmia latifolia 'Elf' (Elf Mountain Laurel)
Kalmia latifolia 'Sarah' (Sarah Mountain Laurel)
Kalmia microphylla (Western Bog Laurel)
Kalmia polifolia (Bog Laurel)
Keckiella
Keckiella cordifolia (heartleaf keckiella)
Kennedia
Kennedia prostrata (Running Postman)
Kennedia rubicunda (Dusky coral pea)
Kerria
Kerria japonica (Japanese kerria)
Kerria japonica 'Picta' (Variegated Japanese Kerria)
Kerria japonica 'Pleniflora' (double kerria)
Kindbergia
Kindbergia oregana (Oregon Beaked Moss)
Kindbergia praelonga (Common Feather-moss)
Kingia
Kingia australis (bullanock)
Kirengeshoma palmata (yellow waxbells)
Knautia
Knautia arvensis (Field Scabious)
Knautia macedonica (Macedonian Scabious)
Kniphofia (Pokers)
Kniphofia Hybrids (torch lily, red hot poker)
Kniphofia uvaria (Red Hot Poker)
Koeleria
Koeleria macrantha (Prairie Junegrass)
Koelreuteria
Koelreuteria paniculata (goldenrain tree)
Koenigia
Koenigia alpina
Koenigia campanulata (Lesser Knotweed)
Kosteletzkya
Kosteletzkya pentacarpos (Saltmarsh mallow)
Krameria
Krameria bicolor (White Rhatany)
Krameria erecta (Littleleaf Rhatany)
Krameria lanceolata (Trailing Rhatany)
Krascheninnikovia
Krascheninnikovia lanata (Winterfat)
Krigia (Dwarf dandelions)
Krigia biflora (Two-flower Dwarf-dandelion)
Krigia virginica (Virginia dwarfdandelion)
Kroenleinia
Kroenleinia grusonii (golden barrel cactus)
Kummerowia
Kummerowia striata (Japanese Clover)
Kunzea
Kunzea ambigua (Butterfly Bush)
Kunzea capitata (Pink Kunzea)
Kunzea leptospermoides (Yarra burgan)
Kunzea pomifera (Muntries)
Laburnum (Laburnums)
Laburnum anagyroides (golden chain tree)
Laburnum x watereri (Goldenchain Tree)
Lachenalia (Cape Cowslips)
Lactuca (wild lettuces)
Lactuca biennis (tall blue lettuce)
Lactuca canadensis (Canada wild lettuce)
Lactuca floridana (woodland lettuce)
Lactuca sativa 'Bibb' (Bibb Lettuce)
Lactuca sativa 'Buttercrunch' (Buttercrunch Lettuce)
Lactuca sativa 'Great Lakes' (Great Lakes Lettuce)
Lactuca sativa 'Red Sails' (Red Sails Lettuce)
Lactuca sativa 'Romaine' (Romaine Lettuce)
Lactuca sativa var. capitata (Head Lettuce)
Lactuca sativa var. crispa (Leaf Lettuce)
Lactuca sativa var. longifolia (Romaine Lettuce)
Lactuca serriola (prickly lettuce)
Lactuca virosa (bitter lettuce)
Lagenophora
Lagenophora stipitata (Blue Bottle-daisy)
Lagenophora sublyrata (slender bottle-daisy)
Lagerstroemia (crape-myrtles)
Lagerstroemia indica 'Bellini Grape' (Bellini Grape Crape Myrtle)
Lagerstroemia indica 'Catawba' (Catawba Crape Myrtle)
Lagerstroemia indica 'Muskogee' (Muskogee Crape Myrtle Tree)
Lagerstroemia indica 'Natchez' (Natchez Crape Myrtle)
Lagerstroemia indica 'Pink Velour' (Pink Velour Crape Myrtle)
Lagerstroemia indica 'Pocomoke' (Pocomoke Crape Myrtle)
Lagerstroemia indica 'Red Rocket' (Red Rocket Crape Myrtle Tree)
Lagerstroemia indica 'Tonto' (Tonto Crape Myrtle Tree)
Lagerstroemia indica 'Tuscarora' (Tuscarora Crape Myrtle)
Lagerstroemia indica 'Zuni' (Zuni Crape Myrtle)
Lagerstroemia spp. (crape myrtle)
Lagunaria
Lagunaria patersonia (Norfolk Island hibiscus)
Lagurus
Lagurus ovatus (Hare's Tail Grass)
Lambertia
Lambertia formosa (Mountain Devil)
Lamiastrum
Lamiastrum galeobdolon (yellow archangel)
Lamium (deadnettles and archangels)
Lamium album (White deadnettle)
Lamium amplexicaule (henbit deadnettle)
Lamium galeobdolon (yellow archangel)
Lamium hybridum (cutleaf deadnettle)
Lamium maculatum (deadnettle)
Lamium maculatum 'Beacon Silver'
Lamium purpureum (red deadnettle)
Lampranthus (dewplants)
Lamprocapnos
Lamprocapnos spectabilis (bleeding heart)
Lantana (Lantanas)
Lantana × hybrida (New Gold Lantana)
Lantana montevidensis (creeping lantana)
Lantana strigocamara (Lantana)
Lantana urticoides (Texas lantana)
Lapageria
Lapageria rosea
Laportea (wood nettles)
Laportea canadensis (wood nettle)
Lapsana
Lapsana communis (nipplewort)
Larix (larches)
Larix decidua (European Larch)
Larix decidua 'Pendula' (Weeping European Larch)
Larix kaempferi (Japanese Larch)
Larix kaempferi 'Diana' (Diana Larch)
Larix kaempferi 'Pendula' (Weeping Japanese Larch)
Larix laricina (tamarack)
Larix occidentalis (Western Larch)
Larix spp. (larch)
Larrea
Larrea tridentata (Creosote Bush)
Laserpitium
Laserpitium siler
Lasiopetalum
Lasiopetalum ferrugineum (Rusty Petals)
Lasthenia (goldfields)
Lasthenia californica (California goldfields)
Lasthenia gracilis (common goldfields)
Lathraea
Lathraea clandestina (Purple Toothwort)
Lathraea squamaria (Common Toothwort)
Lathyrus (sweet peas and vetchlings)
Lathyrus hirsutus (Hairy Vetchling)
Lathyrus japonicus (seaside pea)
Lathyrus latifolius (broad-leaved sweet pea)
Lathyrus linifolius (Bitter Vetch)
Lathyrus nissolia (Grass Vetchling)
Lathyrus pratensis (meadow pea)
Lathyrus tuberosus
Lathyrus vestitus (Pacific pea)
Laurencia
Laurus nobilis (bay laurel)
Lavandula (Lavenders)
Lavandula angustifolia (English lavender)
Lavandula angustifolia 'Hidcote' (Hidcote Lavender)
Lavandula angustifolia 'Munstead' (Munstead Lavender)
Lavandula × intermedia (Lavandin)
Lavandula × intermedia 'Provence' (Provence Lavender)
Lavandula stoechas (Spanish lavender)
Laxmannia
Laxmannia gracilis (Slender Wire Lily)
Layia
Layia glandulosa (whitedaisy tidytips)
Layia platyglossa (tidy tips)
Ledebouria
Leichhardtia
Leichhardtia rostrata (Common Milk Vine)
Lemna (Duckweeds)
Lemna minor (Common Duckweed)
Leonotis (lion's ears)
Leonotis leonurus (lion's tail)
Leontodon (hawkbits)
Leontodon hispidus (Rough Hawkbit)
Leontodon saxatilis (Hairy Hawkbit)
Leonurus
Leonurus cardiaca (common motherwort)
Lepechinia
Lepechinia calycina (California Pitcher Sage)
Lepidium (Pepperweeds)
Lepidium campestre (field peppergrass)
Lepidium didymum (Lesser swine-cress)
Lepidium draba (Heart-podded Hoary Cress)
Lepidium latifolium (perennial pepperweed)
Lepidium nitidum (Shining Pepperweed)
Lepidium virginicum (Virginia pepperweed)
Lepidospartum
Lepidospartum squamatum (California Broomsage)
Lepidosperma
Lepidosperma carphoides (black rapier-sedge)
Lepidosperma elatius (tall sword-sedge)
Lepidosperma gladiatum (Coast Sword-sedge)
Lepidosperma laterale (variable sword-sedge)
Lepidosperma semiteres (Wire rapier-sedge)
Leporella
Leporella fimbriata (Hare Orchid)
Leptecophylla
Leptecophylla parvifolia (Mountain Pinkberry)
Leptoceras
Leptoceras menziesii (Rabbit Orchid)
Leptorhynchos
Leptorhynchos squamatus (Scaly-buttons)
Leptorhynchos tenuifolius (Wiry Buttons)
Leptosiphon
Leptosiphon parviflorus (variable linanthus)
Leptospermum (Tea Trees)
Leptospermum continentale (prickly tea-tree)
Leptospermum lanigerum (Woolly Teatree)
Leptospermum polygalifolium (Tantoon)
Leptospermum scoparium (Mānuka)
Leptospermum squarrosum (Peach-flowered Tea Tree)
Leschenaultia
Leschenaultia biloba (Blue Leschenaultia)
Lespedeza (bush clovers and lespedezas)
Lespedeza capitata (round-headed bush clover)
Lespedeza cuneata (Chinese bushclover)
Lespedeza hirta (hairy lespedeza)
Lespedeza virginica (slender bush clover)
Leucaena (leadtrees)
Leucaena leucocephala (White leadtree)
Leucanthemum maximum (max chrysanthemum)
Leucanthemum × superbum 'Becky' (Becky Shasta Daisy)
Leucanthemum vulgare (Oxeye Daisy)
Leucanthemum x superbum (Shasta daisy)
Leucanthemum x superbum 'Alaska' (Alaska Shasta Daisy)
Leucobryum (Leucobryum mosses)
Leucobryum albidum (white moss)
Leucobryum glaucum (Pincushion Moss)
Leucocrinum
Leucocrinum montanum (common starlily)
Leucojum
Leucojum aestivum (spring snowflakes)
Leucophyllum (silverleaves)
Leucophyllum frutescens 'Green Cloud' (Green Cloud Texas Sage)
Leucophyta
Leucophyta brownii (Cushion Bush)
Leucopogon
Leucopogon affinis (Lance Beard-heath)
Leucopogon microphyllus (Small-leafed White Beard)
Leucopogon parviflorus (coastal beard-heath)
Leucopogon verticillatus (Tassel Flower)
Leucopogon virgatus (common beard-heath)
Leucospermum
Leucospermum cuneiforme
Leucospermum × hybridum (Pincushion Hybrids)
Leucothoë
Leucothoë axillaris (drooping leucothoe)
Leucothoë fontanesiana 'Girard's Rainbow' (Rainbow leucothoe)
Lewinskya
Lewinskya affinis (Wood Bristle-moss)
Lewisia
Lewisia columbiana (Columbia Lewisia)
Lewisia cotyledon (lewisia)
Lewisia rediviva (Bitterroot)
Leycesteria formosa (Himalayan honeysuckle)
Leymus
Leymus condensatus (giant wild rye)
Leymus mollis (Dune Grass)
Liatris (blazing-stars)
Liatris aspera (rough blazing star)
Liatris ligulistylis (Meadow Blazing Star)
Liatris punctata (dotted gayfeather)
Liatris pycnostachya (prairie blazing star)
Liatris spicata (prairie star)
Liatris spicata 'Kobold' (Kobold Liatris)
Libertia
Libertia chilensis
Libertia grandiflora
Licuala
Licuala grandis (Ruffled Fan Palm)
Ligularia
Ligularia dentata (ligularia)
Ligusticum
Ligusticum lucidum
Ligusticum scoticum
Ligustrum (privets)
Ligustrum japonicum (Waxleaf Privet)
Ligustrum japonicum 'Texanum' (waxleaf privot)
Ligustrum lucidum (tree privet)
Ligustrum obtusifolium (border privet)
Ligustrum ovalifolium (garden privet)
Ligustrum ovalifolium 'Aureum' (golden privet)
Ligustrum quihoui (Quihoui privet)
Ligustrum sinense 'Variegatum' (Variegated Privet)
Ligustrum vulgare (common privet)
Lilium (true lilies)
Lilium (Asiatic Hybrids) (Asiatic lilies)
Lilium candidum (Madonna lily)
Lilium hansonii
Lilium lancifolium (tiger lily)
Lilium michiganense (Michigan lily)
Lilium (Orienpet Hybrids) (orienpet lilies)
Lilium (Oriental Hybrids) (oriental lilies)
Lilium pardalinum (Leopard Lily)
Lilium philadelphicum (Wood Lily)
Lilium superbum (Turk's-cap lily)
Limbarda
Limbarda crithmoides (Golden Samphire)
Limonium (Sea-Lavenders)
Limonium carolinianum (Carolina Sea Lavender)
Limonium vulgare (Common Sea-lavender)
Linanthus
Linanthus pungens (Granite Prickly Phlox)
Linaria (Toadflaxes)
Linaria canadensis (Canada toadflax)
Linaria dalmatica (Balkan toadflax)
Linaria purpurea (toadflax)
Linaria repens (Pale Toadflax)
Linaria texana (Texas toadflax)
Linaria vulgaris (common toadflax)
Lindera (spicebushes)
Lindera benzoin (northern spicebush)
Lindheimera
Lindheimera texana (Texas yellow star)
Lindsaea
Lindsaea linearis (Screw Fern)
Lindsaea microphylla (lacy wedge fern)
Linnaea
Linnaea borealis (twinflower)
Linospadix
Linospadix monostachyus (Walking stick palm)
Linum (Flaxes)
Linum bienne (Pale flax)
Linum catharticum (Fairy Flax)
Linum grandiflorum (Scarlet Flax)
Linum lewisii (Lewis flax)
Linum marginale (Australian Flax)
Linum perenne
Linum usitatissimum (common flax)
Liquidambar (sweetgums)
Liquidambar styraciflua (sweetgum)
Liquidambar styraciflua 'Worplesdon' (Worplesdon Sweet Gum)
Liriodendron (Tulip trees)
Liriodendron tulipifera (tulip tree)
Liriodendron tulipifera 'Aureomarginatum' (Variegated Tulip Tree)
Liriodendron tulipifera 'Fastigiatum' (Fastigiate Tulip Tree)
Liriope muscari (lily turf)
Liriope muscari 'Big Blue' (Big Blue Lilyturf)
Liriope muscari 'Monroe White' (Monroe White Lilyturf)
Liriope muscari 'Royal Purple' (Royal Purple Lilyturf)
Liriope muscari 'Variegata' (Variegated Lilyturf)
Liriope spicata (Creeping Lilyturf)
Lissanthe
Lissanthe strigosa (peach heath)
Lithodora
Lithodora diffusa (Lithodora)
Lithophragma (woodland stars)
Lithophragma affine (San Francisco woodland-star)
Lithophragma heterophyllum (hillside woodland star)
Lithophragma parviflorum (smallflower woodland star)
Lithospermum (stoneseeds, puccoons, and gromwells)
Lithospermum canescens (hoary puccoon)
Lithospermum caroliniense (hairy puccoon)
Lithospermum incisum (narrowleaf puccoon)
Lithospermum officinale (Common Gromwell)
Lithospermum ruderale (western stoneseed)
Lithothamnion (Crustose coralline algae)
Lithotoma
Lithotoma axillaris (rock isotome)
Livistona
Livistona australis (Australian Fan Palm)
Livistona chinensis (Chinese Fan Palm)
Lobelia (Lobelias)
Lobelia anceps (angled lobelia)
Lobelia cardinalis (cardinal flower)
Lobelia erinus (bedding lobelia)
Lobelia gibbosa (tall lobelia)
Lobelia inflata (Indian tobacco)
Lobelia laxiflora var. angustifolia (Narrow-leaved Mexican Lobelia)
Lobelia puberula (downy lobelia)
Lobelia purpurascens (White Root)
Lobelia siphilitica (Great Blue Lobelia)
Lobelia spicata (pale-spiked lobelia)
Lobelia trigonocaulis (forest lobelia)
Lobularia
Lobularia maritima (sweet alyssum)
Lolium (Ryegrasses)
Lolium arundinaceum (tall fescue)
Lolium × boucheanum (Hybrid Ryegrass)
Lolium perenne (Perennial Ryegrass)
Lomandra
Lomandra confertifolia (clumped matrush)
Lomandra filiformis (wattle mat-rush)
Lomandra hystrix (green mat-rush)
Lomandra multiflora (Many Flowered Matrush)
Lomandra obliqua (Fish Bones)
Lomatia
Lomatia ilicifolia (Holly Lomatia)
Lomatia silaifolia (Crinkle Bush)
Lomatium (Biscuitroots)
Lomatium dasycarpum (woollyfruit desertparsley)
Lomatium triternatum (Ternate Desert-parsley)
Lomatium utriculatum (Spring Gold Biscuitroot)
Lonicera (honeysuckles)
Lonicera × bella (showy fly honeysuckle)
Lonicera canadensis (American fly-honeysuckle)
Lonicera ciliosa (trumpet honeysuckle)
Lonicera fragrantissima (Winter honeysuckle)
Lonicera hispidula (Pink Honeysuckle)
Lonicera involucrata (twinberry honeysuckle)
Lonicera involucrata (twinberry honeysuckle)
Lonicera japonica 'Aureoreticulata' (Golden Net Honeysuckle)
Lonicera ligustrina (Boxleaf Honeysuckle)
Lonicera ligustrina var. yunnanensis (box honeysuckle)
Lonicera ligustrina var. yunnanensis 'Baggesen's Gold' (Golden box honeysuckle)
Lonicera maackii (Amur honeysuckle)
Lonicera morrowii (Morrow's honeysuckle)
Lonicera nitida (Boxleaf Honeysuckle)
Lonicera pileata (box-leaved honeysuckle)
Lonicera × purpusii (Winter Beauty Honeysuckle)
Lonicera sempervirens (Coral Honeysuckle)
Lonicera subspicata (Southern Honeysuckle)
Lonicera tatarica (Tatarian honeysuckle)
Lonicera xylosteum (Fly Honeysuckle)
Lophiolepis
Lophiolepis eriophora (Woolly Thistle)
Lophocolea
Lophocolea bidentata (Bifid Crestwort)
Lophocolea semiteres (Southern Crestwort)
Lophostemon
Lophostemon confertus (Brush Box)
Lophostemon suaveolens (swamp box)
Loropetalum
Loropetalum chinense (Jazz Hands® Pink Loropetalum)
Loropetalum chinense var. rubrum (Ruby Loropetalum)
Lotus (bird's-foot trefoils)
Lotus corniculatus (bird's-foot trefoil)
Lotus pedunculatus (big bird's-foot trefoil)
Ludwigia (Primrose-willows)
Ludwigia alternifolia (Seedbox)
Ludwigia octovalvis (Mexican Primrose-willow)
Ludwigia palustris (Water Purslane)
Ludwigia peploides (floating primrose-willow)
Ludwigia peruviana (Peruvian primrose-willow)
Lunaria
Lunaria annua (moneyplant)
Lunaria rediviva
Lunularia
Lunularia cruciata (Crescent-cup liverwort)
Lupinus (lupines)
Lupinus albicaulis (Sicklekeel Lupine)
Lupinus albifrons (Silver Bush Lupine)
Lupinus arboreus (coastal bush lupine)
Lupinus argenteus (silvery lupine)
Lupinus arizonicus (Arizona lupine)
Lupinus bicolor (Miniature Lupine)
Lupinus concinnus (bajada lupine)
Lupinus hirsutissimus (Stinging Lupine)
Lupinus latifolius (wild lupine)
Lupinus lepidus (Dwarf Lupine)
Lupinus microcarpus (chick lupine)
Lupinus nanus (Sky Lupine)
Lupinus perennis (Sundial Lupine)
Lupinus polyphyllus (garden lupine)
Lupinus rivularis (Riverbank Lupine)
Lupinus sparsiflorus (Coulter's lupine)
Lupinus succulentus (arroyo lupine)
Lupinus texensis (Texas bluebonnet)
Lupinus truncatus (collared annual lupine)
Luzula (woodrushes)
Luzula campestris (Field woodrush)
Luzula meridionalis (Common Wood-rush)
Luzula nivea
Luzula parviflora (small-flowered wood rush)
Luzula pilosa (Hairy Woodrush)
Luzula sylvatica (Great Woodrush)
Lychnis
Lychnis alpina (Alpine Campion)
Lychnis chalcedonica (Maltese cross)
Lychnis coronaria (rose campion)
Lychnis flos-cuculi
Lycianthes
Lycium (boxthorns)
Lycium andersonii (Anderson Thornbush)
Lycium barbarum (Goji Berry)
Lycium ferocissimum (African boxthorn)
Lycopodium (ground and creeping clubmosses)
Lycopodium clavatum (stag's-horn clubmoss)
Lycopodium deuterodensum (Bushy Clubmoss)
Lycopus (water horehounds)
Lycopus americanus (American bugleweed)
Lycopus europaeus (European water-horehound)
Lycopus uniflorus (northern bugleweed)
Lycoris
Lycoris radiata (red spider lily)
Lycoris squamigera (Surprise Lily)
Lygodesmia
Lygodesmia texana (Texas Skeleton Plant)
Lygodium (climbing ferns)
Lygodium japonicum (Japanese climbing fern)
Lyonia
Lyonia fruticosa (coastal plain staggerbush)
Lyonia ligustrina (He-huckleberry)
Lyonia lucida (fetterbush lyonia)
Lyperanthus
Lyperanthus suaveolens (brown beaks)
Lysiana
Lysiana exocarpi (Harlequin Mistletoe)
Lysichiton
Lysichiton americanus (swamp lanterns, skunk cabbage)
Lysimachia (Loosestrifes)
Lysimachia arvensis (scarlet pimpernel)
Lysimachia borealis (northern starflower)
Lysimachia ciliata 'Purpurea' (purple leaf loosestrife)
Lysimachia clethroides (Gooseneck Loosestrife)
Lysimachia europaea (Arctic Starflower)
Lysimachia latifolia (Western Starflower)
Lysimachia loeflingii (Blue Scarlet Pimpernel)
Lysimachia maritima (Sea Milkwort)
Lysimachia nemorum (Yellow Pimpernel)
Lysimachia nummularia (creeping Jenny)
Lysimachia punctata (Dotted Loosestrife)
Lysimachia quadrifolia (whorled loosestrife)
Lysimachia tenella (Bog Pimpernel)
Lysimachia terrestris (swamp candles)
Lysimachia vulgaris (Yellow Loosestrife)
Lythrum (Lythrum Loosestrifes)
Lythrum alatum (Winged Loosestrife)
Lythrum hyssopifolia (Hyssop Loosestrife)
Lythrum salicaria (purple loosestrife)
Macadamia
Macadamia integrifolia (Macadamia Nut)
Macaranga
Macaranga tanarius (Elephant's Ear)
Machaeranthera
Machaeranthera tanacetifolia (Tahoka daisy)
Macleaya
Macleaya cordata (plume poppy)
Maclura
Maclura cochinchinensis (Cockspur Thorn)
Maclura pomifera (Osage-orange)
Macroptilium
Macroptilium atropurpureum (Purple Bush-Bean)
Macroptilium lathyroides (Phasey Bean)
Macrozamia
Macrozamia communis (burrawang)
Macrozamia riedlei (Zamia Palm)
Madia (tarweeds)
Madia elegans (Common Madia)
Madia gracilis (grassy tarweed)
Magnolia (magnolias)
Magnolia 'Elizabeth' (Elizabeth Magnolia)
Magnolia fraseri (Fraser Magnolia)
Magnolia 'Galaxy' (Galaxy Magnolia)
Magnolia grandiflora (southern magnolia)
Magnolia grandiflora 'Edith Bogue' (Edith Bogue Magnolia)
Magnolia grandiflora 'Little Gem' (Little Gem Magnolia)
Magnolia 'Iolanthe' (Iolanthe Magnolia)
Magnolia 'Jane' (Jane Magnolia)
Magnolia liliiflora (Lily Magnolia)
Magnolia liliiflora 'Nigra' (Black Lily Magnolia)
Magnolia × loebneri 'Leonard Messel' (Leonard Messel Magnolia)
Magnolia maudiae var. platypetala (Broad-petaled Maud's Magnolia)
Magnolia sieboldii (Oyama magnolia)
Magnolia × soulangeana (saucer magnolia)
Magnolia stellata (star magnolia)
Magnolia stellata 'Royal Star' (Royal Star Magnolia Tree)
Magnolia × 'Susan' (Susan Magnolia Bush)
Magnolia tripetala (umbrella magnolia)
Magnolia virginiana (Sweetbay Magnolia)
Mahonia
Mahonia aquifolium (Oregon grape)
Mahonia nervosa (dwarf Oregon grape)
Mahonia repens (creeping mahonia)
Maianthemum (mayflowers and false Solomon's seals)
Maianthemum bifolium (May Lily)
Maianthemum canadense (Canada mayflower)
Maianthemum dilatatum (false lily of the valley)
Maianthemum racemosum (false Solomon's Seal)
Maianthemum stellatum (star-flowered false Solomon's seal)
Maianthemum tatsienense
Maireana
Maireana brevifolia (Short-leaf Bluebush)
Malacothamnus (bushmallows)
Malacothamnus fasciculatus (southern coastal bushmallow)
Malacothrix
Malacothrix glabrata (desert dandelion)
Malacothrix saxatilis (Cliff Aster)
Malaisia
Malaisia scandens (Burnie Vine)
Malephora (Fingerfigs)
Mallotus
Mallotus claoxyloides (Green Kamala)
Mallotus philippensis (Kamala)
Malosma
Malosma laurina (laurel sumac)
Malpighia
Malpighia emarginata (Acerola Cherry)
Malus (crabapple)
Malus 'Adirondack' (Adirondack Crabapple)
Malus baccata (Siberian crabapple)
Malus 'Butterball'
Malus domestica (apple)
Malus domestica 'Pristine' (Pristine Apple)
Malus 'Evereste' (Evereste Crabapple)
Malus × floribunda (Japanese Crabapple)
Malus floribunda (Crabapple)
Malus fusca (crabapple)
Malus sargentii (Sargent Crabapple Tree)
Malus sylvestris (European Wild Apple)
Malus toringo 'Tina' (Tina Crabapple)
Malus 'Van Eseltine'
Malva (Mallows)
Malva arborea (Tree Mallow)
Malva moschata (musk mallow)
Malva multiflora (Cretan mallow)
Malva neglecta (dwarf mallow, cheese plant)
Malva parviflora (cheeseweed mallow)
Malvastrum
Malvastrum coromandelianum (three-lobe false mallow)
Malva sylvestris (Common Mallow)
Malvaviscus
Malvaviscus arboreus (Turk's cap)
Mammillaria (pincushion cactuses)
Mandevilla (Rocktrumpets)
Mandevilla sanderi (Pink Mandevilla)
Mangifera (mangoes)
Manihot
Marah (Man-roots)
Marah fabacea (California manroot)
Marah macrocarpa (Chilicothe)
Marah oregana (bigroot, manroot)
Maranta
Maranta leuconeura (Prayer Plant)
Maranta leuconeura 'Lemon Lime' (Lemon Lime Prayer Plant)
Maranta leuconeura var. erythroneura (Red Prayer Plant)
Marchantia
Marchantia polymorpha (Common Liverwort)
Marrubium
Marrubium incanum
Marrubium vulgare (White Horehound)
Marsilea
Marsilea drummondii (Common Nardoo)
Matelea
Matelea reticulata (Pearl Milkweed)
Matricaria (German chamomiles and pineapple-weeds)
Matricaria chamomilla (German Chamomile)
Matricaria discoidea (pineapple weed)
Matteuccia
Matteuccia struthiopteris (Ostrich Fern)
Matthiola (Stock)
Matthiola bicornis (night-scented stock)
Maurandella
Maurandella antirrhiniflora (Snapdragon Vine)
Maxillaria (tiger orchids)
Mazus
Mazus pumilus (Asian mazus)
Meconopsis
Meconopsis 'Lingholm' (blue poppy)
Medeola
Medeola virginiana (Cucumber Root)
Medicago (medicks)
Medicago arabica (Spotted medick)
Medicago lupulina (black medic)
Medicago polymorpha (bur clover)
Medicago sativa (Alfalfa)
Megathyrsus
Megathyrsus maximus (Guinea Grass)
Melaleuca (bottlebrushes)
Melaleuca alternifolia
Melaleuca armillaris (Bracelet Honey-myrtle)
Melaleuca bracteata (black tea-tree)
Melaleuca citrina (crimson bottlebrush)
Melaleuca decussata (Totem-poles)
Melaleuca ericifolia (Swamp Paperbark)
Melaleuca fulgens
Melaleuca lanceolata (Moonah)
Melaleuca leucadendra (Weeping Paperbark)
Melaleuca linariifolia (Snow-in-Summer)
Melaleuca linearis (Narrow-leaved Bottlebrush)
Melaleuca nesophila (Showy Honey-myrtle)
Melaleuca nodosa (prickly-leaved paperbark)
Melaleuca paludicola (river bottlebrush)
Melaleuca quadrifida (One-sided Bottlebrush)
Melaleuca quinquenervia (Broad-leaved paperbark)
Melaleuca salicina (Willow bottlebrush)
Melaleuca squamea (swamp honey-myrtle)
Melaleuca squarrosa (scented paperbark)
Melaleuca styphelioides (Prickly-leaved Paperbark)
Melaleuca thymifolia (thyme honey-myrtle)
Melaleuca uncinata (broombush)
Melaleuca velutina
Melaleuca viminalis (weeping bottlebrush)
Melampodium
Melampodium leucanthum (blackfoot daisy)
Melampyrum
Melampyrum lineare (narrowleaf cow wheat)
Melampyrum pratense (Common Cow-wheat)
Melastoma (melastomes)
Melastoma malabathricum (Malabar Melastome)
Melia
Melia azedarach (Chinaberry)
Melica (melicgrasses)
Melica altissima 'Atropurpurea'
Melica nutans
Melica uniflora (Wood Melick)
Melichrus
Melichrus urceolatus (urn heath)
Melicope
Melicope elleryana (pink-flowered doughwood)
Melicytus
Melicytus dentatus (tree violet)
Melilotus (melilots and sweetclovers)
Melilotus albus (White Sweetclover)
Melilotus altissimus (tall melilot)
Melilotus indicus (small melilot)
Melilotus officinalis (Yellow Sweetclover)
Melinis
Melinis repens (Natal Grass)
Melissa
Melissa officinalis (Lemon Balm)
Melittis
Melittis melissophyllum subsp. albida
Melothria
Melothria pendula (creeping cucumber)
Menispermum
Menispermum canadense (moonseed)
Mentha (mints)
Mentha aquatica (watermint)
Mentha canadensis (Wild Mint)
Mentha × piperita (Peppermint)
Mentha pulegium (Pennyroyal)
Mentha spicata (Spearmint)
Mentha suaveolens (Apple Mint)
Mentzelia (Blazingstars)
Mentzelia albicaulis (Whitestem Blazingstar)
Mentzelia involucrata (sand blazingstar)
Mentzelia laevicaulis (Giant Blazingstar)
Menyanthes
Menyanthes trifoliata (Bogbean)
Mercurialis
Mercurialis annua (Annual mercury)
Mercurialis perennis (Dog's Mercury)
Mertensia (Bluebells)
Mertensia ciliata (mountain bluebells)
Mertensia platyphylla (Broadleaf Bluebell)
Mertensia virginica (Virginia Bluebells)
Mesembryanthemum (ice plants)
Mesembryanthemum crystallinum (Crystalline ice plant)
Metalasia (Blombushes)
Metasequoia (dawn redwoods)
Metasequoia glyptostroboides (dawn redwood)
Metrosideros (Rātā and allies)
Metrosideros polymorpha (ʻŌhiʻa Lehua)
Metzgeria
Metzgeria furcata (Forked Veilwort)
Metzgeria violacea (Bluish Veilwort)
Meum
Meum athamanticum
Miconia
Micranthes (Early saxifrages)
Micranthes californica (California Saxifrage)
Micranthes stellaris (Hairy Kidney-wort)
Micranthes virginiensis (Virginia saxifrage)
Microbiota
Microbiota decussata (Russian Cypress)
Microgramma (Snakeferns)
Microlaena
Microlaena stipoides (Weeping-grass)
Micropus
Micropus californicus (Q-tips)
Microseris
Microseris walteri (Murnong)
Microsorum
Microsorum diversifolium (Kangaroo Paw Fern)
Microsorum musifolium (Crocodile Fern)
Microsorum pustulatum (hound's tongue fern)
Microsorum thailandicum (Blue Oil Fern)
Microstegium
Microstegium vimineum (Japanese stiltgrass)
Microsteris
Microsteris gracilis (slender phlox)
Microtis (Onion Orchids)
Microtis arenaria (Pale Onion-orchid)
Microtis parviflora (slender onion-orchid)
Microtis unifolia (common onion-orchid)
Mikania (hempvines)
Mikania scandens (climbing hempvine)
Milium
Milium effusum (Wood Millet)
Mimosa (Sensitive Plants)
Mimosa microphylla (littleleaf sensitive-briar)
Mimosa nuttallii (Catclaw Briar)
Mimosa pudica (Sensitive Plant)
Mimosa quadrivalvis (Fourvalve Mimosa)
Mimosa strigillosa (sunshine mimosa)
Mimulus
Mimulus alatus (sharpwing monkeyflower)
Mimulus ringens (Allegheny monkeyflower)
Mirabilis (four o'clocks)
Mirabilis jalapa (Marvel of Peru)
Mirabilis laevis (Wishbone Bush)
Mirabilis multiflora (Colorado Four o'Clock)
Mirabilis nyctaginea (Wild Four o'Clock)
Mirbelia
Mirbelia rubiifolia (Heathy Mirbelia)
Miscanthus (Silvergrasses)
Miscanthus sinensis (Miscanthus)
Miscanthus sinensis 'Cosmopolitan' (Cosmopolitan Maiden Grass)
Miscanthus sinensis 'Gracillimus' (Gracillimus Maiden Grass)
Miscanthus sinensis 'Morning Light' (Morning Light Maiden Grass)
Miscanthus sinensis 'Silberfeder' (Silver Feather Maiden Grass)
Miscanthus sinensis 'Strictus' (Porcupine Grass)
Miscanthus sinensis 'Variegatus' (Variegated Maiden Grass)
Miscanthus sinensis 'Zebrinus' (Zebra Grass)
Mitchella
Mitchella repens (partridgeberry)
Mitella
Mitella breweri
Mitella diphylla (twoleaf miterwort)
Mitella ovalis (Coastal Miterwort)
Mitellastra
Mitellastra caulescens (Leafy Miterwort)
Mitrasacme
Mitrasacme polymorpha (Mitre Weed)
Mnium
Mnium hornum (Horn Calcareous Moss)
Modiola
Modiola caroliniana (Bristly Mallow)
Moehringia
Moehringia trinervia (Three-nerved Sandwort)
Molinia
Molinia caerulea 'Variegata' (Variegated Purple Moor Grass)
Mollugo
Mollugo verticillata (green carpetweed)
Moltkia
Moltkia doerfleri
Momordica
Momordica charantia (Bitter Melon)
Monarda (beebalms and bergamots)
Monarda bradburiana (Eastern Bee Balm)
Monarda citriodora (lemon beebalm)
Monarda didyma (Bee Balm)
Monarda didyma 'Jacob Cline' (Jacob Cline Bee Balm)
Monarda fistulosa (Wild Bergamot)
Monarda 'Gardenview Scarlet' (Bee Balm Gardenview Scarlet)
Monarda 'Marshall's Delight' (Marshall's Delight Bee Balm)
Monarda 'Petite Delight' (Petite Delight Bee Balm)
Monarda punctata (spotted horsemint)
Monarda spp. (Bee Balm Mix)
Monardella (Monardellas)
Monardella odoratissima (mountain coyote mint)
Monardella villosa (Coyote Mint)
Monnina
Monoptilon
Monoptilon bellioides (Mojave desertstar)
Monotoca
Monotoca elliptica (Tree Broom-heath)
Monotoca scoparia (Prickly Broom-heath)
Monotropa
Monotropa hypopitys (pinesap)
Monotropa uniflora (Ghost Pipe)
Monstera
Monstera adansonii (Swiss Cheese Vine)
Monstera deliciosa (Swiss Cheese Plant)
Monstera siltepecana (Silver Monstera)
Montia
Montia fontana (blinks)
Montia parvifolia (Littleleaf Miner's-Lettuce)
Moraea (Cape Tulips)
Moraea flaccida (Great Tulip)
Moraea setifolia (Paper Glasstulp)
Morella (Bayberries)
Morella californica (California wax myrtle)
Morella cerifera (Wax Myrtle)
Morella pensylvanica (northern bayberry)
Moringa (Moringas)
Moringa oleifera (Moringa)
Morus (Mulberries)
Morus rubra (red mulberry)
Muehlenbeckia
Muehlenbeckia adpressa (Climbing Lignum)
Muellerina
Muellerina eucalyptoides (creeping mistletoe)
Muhlenbergia (muhly)
Muhlenbergia capillaris (Pink Muhly Grass)
Muhlenbergia dumosa (Bamboo Muhly)
Muhlenbergia lindheimeri (Lindheimer's Muhly)
Muhlenbergia reverchonii (Seep Muhly)
Muhlenbergia rigens (deergrass)
Mukdenia
Mukdenia rossii 'Karasuba' (Karasuba Mukdenia)
Mummenhoffia
Mummenhoffia alliacea (garlic penny-cress)
Muraltia (Purplegorses)
Murdannia
Murdannia graminea (Grass Lily)
Murraya
Musa (Bananas)
Musa acuminata (Dwarf Banana Plant)
Musa basjoo (Hardy Banana)
Musa × paradisiaca (Plantain)
Musa textilis (abacá, Manila hemp)
Muscari (Grape hyacinths)
Muscari armeniacum (grape hyacinth)
Muscari botryoides (common grape hyacinth)
Muscari neglectum (Musk Hyacinth)
Mussaenda
Mutarda
Mutarda arvensis (charlock)
Mutarda nigra (Black Mustard)
Mycelis
Mycelis muralis (wall lettuce)
Mycelis muralis (wall lettuce)
Myoporum (Ngaios)
Myoporum boninense (Boobialla)
Myoporum insulare (common boobialla)
Myoporum montanum (waterbush)
Myoporum parvifolium
Myoporum petiolatum (Sticky Boobialla)
Myosotis (Forget-me-nots)
Myosotis arvensis (field forget-me-not)
Myosotis discolor (Changing Forget-me-not)
Myosotis latifolia (broadleaf forget-me-not)
Myosotis ramosissima (Early Forget-me-not)
Myosotis scorpioides (water forget-me-not)
Myosotis sylvatica (forget-me-not)
Myosotis sylvatica 'Bluesylva' (Bluesylva Forget-Me-Not)
Myosotis sylvatica 'Rosylva' (Rosylva Forget-Me-Not)
Myrica
Myrica californica (California Wax Myrtle; California Bayberry)
Myrica gale (Sweetgale)
Myriophyllum (Milfoils)
Myriophyllum aquaticum (parrotfeather)
Myriophyllum spicatum (Eurasian watermilfoil)
Myriopteris (lip ferns)
Myrrhis
Myrrhis odorata (sweet cicely)
Myrsine (Colicwood)
Myrsine howittiana (Brush Muttonwood)
Myrsine variabilis (Variable Muttonwood)
Myrtus
Myrtus communis
Nabalus (rattlesnake roots)
Nabalus albus (white rattlesnake root)
Nabalus altissimus (tall rattlesnake root)
Nabalus trifoliolatus (three-leaved rattlesnake root)
Narcissus (daffodil)
Narcissus 'February Gold' (February Gold Daffodil)
Narcissus × incomparabilis (Nonesuch Daffodil)
Narcissus 'Jack Snipe' (Jack Snipe Daffodil)
Narcissus 'King Alfred' (King Alfred Daffodil)
Narcissus × medioluteus (Primrose-peerless)
Narcissus 'Mount Hood' (Mount Hood Daffodil)
Narcissus pseudonarcissus (wild daffodil)
Narcissus 'Saint Keverne' (Saint Keverne Daffodil)
Narcissus 'Thalia' (Thalia Daffodil)
Narthecium
Narthecium ossifragum (bog asphodel)
Nassella
Nassella pulchra (purple needlegrass)
Nassella tenuissima (Mexican feather/hair grass)
Nasturtium (Watercresses)
Nasturtium officinale (Watercress)
Nekemias
Nekemias arborea (peppervine)
Neltuma (mesquites)
Neltuma glandulosa (honey mesquite)
Neltuma odorata (western honey mesquite)
Neltuma velutina (velvet mesquite)
Nelumbo
Nelumbo lutea (American lotus)
Nematanthus spp. (goldfish plant)
Nemesia (Lionfaces)
Nemophila (baby blue eyes and allies)
Nemophila heterophylla (White nemophila)
Nemophila menziesii (Menzies' baby blue eyes)
Nemophila phacelioides (Texas baby blue eyes)
Neolitsea
Neolitsea dealbata (Bolly Gum)
Neoregelia
Neottia
Neottia nidus-avis (bird's-nest orchid)
Neottia ovata (Common Twayblade)
Nepenthes (tropical pitcher-plants)
Nepeta (catmints)
Nepeta racemosa 'Walker's Low' (Walker's Low catmint)
Nephroia
Nephroia carolina (Carolina snailseed)
Nephrolepis (sword ferns)
Nephrolepis cordifolia (Fishbone Fern)
Nephrolepis exaltata (Boston Fern)
Nephrolepis obliterata (Kimberley Queen Fern)
Nerium (oleanders)
Neurachne
Neurachne alopecuroidea (foxtail mulga grass)
Nicandra
Nicandra physalodes (apple-of-Peru)
Nicotiana (tobaccos)
Nicotiana alata (flowering tobacco)
Nicotiana glauca (tree tobacco)
Nicotiana obtusifolia (desert tobacco)
Nicotiana sylvestris (fragrant tobacco nightshade)
Nigella (Love-in-a-mist)
Nigella damascena (love-in-a-mist)
Nitraria
Nitraria billardierei (nitre bush)
Noccaea
Noccaea fendleri (Fendler's pennycress)
Notelaea
Notelaea longifolia (Large Mock-olive)
Notelaea microcarpa (small-fruited mock olive)
Nothochelone
Nothochelone nemorosa (Woodland Beardtongue)
Nothofagus
Nothofagus cunninghamii (Myrtle Beech)
Notholithocarpus
Notholithocarpus densiflorus (Tanoak)
Nothoscordum
Nothoscordum bivalve (crowpoison)
Nuphar (yellow pond-lilies)
Nuphar advena (spatterdock)
Nuphar lutea (yellow water-lily)
Nuphar polysepala (western yellow pond-lily)
Nuphar variegata (Variegated Yellow Pond-Lily)
Nuytsia
Nuytsia floribunda (Western Australian Christmas Tree)
Nymphaea (Waterlilies)
Nymphaea alba (European White Waterlily)
Nymphaea × marliacea (coloured water-lily)
Nymphaea odorata (American white waterlily)
Nymphoides
Nymphoides indica (Water Snowflake)
Nymphoides peltata (water fringe)
Nyssa (Tupelos)
Nyssa sylvatica (sour gum, tupelo)
Obolaria
Obolaria virginica (pennywort)
Oceaniopteris
Oceaniopteris cartilaginea (hammock fern)
Ochna
Ochna serrulata (Small-leaved plane)
Ocimum (Basils)
Ocimum basilicum 'Purple Ruffles' (Purple Ruffles Basil)
Ocimum tenuiflorum (Holy Basil)
Oclemena
Oclemena acuminata (whorled wood aster)
Odontites
Odontites vernus (Red Bartsia)
Odontites vulgaris (Red Odontites)
Odontonema
Oemleria
Oemleria cerasiformis (osoberry)
Oenanthe
Oenanthe crocata (Hemlock Water-dropwort)
Oenanthe pimpinelloides (Corky-fruited Water-dropwort)
Oenanthe sarmentosa (water-parsley)
Oenothera (evening primroses, sundrops, and beeblossoms)
Oenothera biennis (evening primrose)
Oenothera capillifolia (Berlandier's sundrops)
Oenothera cespitosa (fragrant evening primrose)
Oenothera curtiflora (velvetweed)
Oenothera elata (tall evening primrose)
Oenothera fruticosa (evening primrose)
Oenothera gaura (biennial beeblossom)
Oenothera glazioviana (Large-flowered Evening-primrose)
Oenothera laciniata (cutleaf evening primrose)
Oenothera lindheimeri (wandflower)
Oenothera macrocarpa (bigfruit evening primrose)
Oenothera pallida (Pale Evening Primrose)
Oenothera parviflora (northern evening-primrose)
Oenothera speciosa (pinkladies, pink evening primrose)
Oenothera suffrutescens (Scarlet Beeblossom)
Oenothera suffulta (roadside gaura)
Oenothera tetragona
Oenothera triloba (Stemless Evening Primrose)
Olea (Olives)
Olea europaea (Olive Tree)
Olearia (Daisybushes)
Olearia argophylla (musk daisy-bush)
Olearia axillaris (Coastal Daisy-Bush)
Olearia lirata (snowy daisy-bush)
Olearia macrodonta
Olearia phlogopappa (Asthma Bush)
Olearia ramulosa (Twiggy Daisy-Bush)
Olneya
Olneya tesota (desert ironwood)
Oncidium (dancing lady orchids)
Oncidium sphacelatum (Spider Orchid Bush)
Oncosiphon
Oncosiphon pilulifer (stinknet)
Onobrychis (Sainfoins)
Onobrychis viciifolia (Sainfoin)
Onoclea
Onoclea sensibilis (sensitive fern)
Ononis (restharrows)
Ononis spinosa (Spiny restharrow)
Onopordum (cotton thistles)
Onopordum acanthium (Scotch thistle)
Ophioglossum
Ophioglossum vulgatum (southern adder's-tongue)
Ophiopogon (Lily-Turfs)
Ophiopogon japonicus (Mondo Grass)
Ophiopogon planiscapus
Ophiopogon planiscapus 'Nigrescens' (Black mondo grass)
Ophrys (Bee Orchids)
Ophrys apifera (Bee Orchid)
Ophrys insectifera (Fly Orchid)
Oplismenus (Basketgrasses)
Oplismenus hirtellus (Basket Grass)
Oplopanax
Oplopanax horridus (devil's club)
Opuntia (Prickly Pears)
Opuntia austrina (Florida Pricklypear)
Opuntia basilaris (Beavertail Pricklypear)
Opuntia cespitosa (Eastern Pricklypear)
Opuntia × columbiana (Columbia Pricklypear)
Opuntia × demissa
Opuntia engelmannii (Engelmann's Pricklypear)
Opuntia ficus-indica (Prickly Pear Cactus)
Opuntia fragilis (Brittle Pricklypear)
Opuntia humifusa (low pricklypear)
Opuntia lindheimeri (Texas Pricklypear)
Opuntia littoralis (Coastal Pricklypear)
Opuntia macrorhiza (prairie pricklypear)
Opuntia microdasys (Bunny Ears Cactus)
Opuntia phaeacantha (Brown-spined Pricklypear)
Opuntia polyacantha (Plains Pricklypear)
Opuntia santa-rita (Santa Rita Prickly Pear)
Opuntia tomentosa (Woollyjoint Pricklypear)
Opuntia × vaseyi (Vasey's Pricklypear)
Orchis
Orchis anthropophora (Man Orchid)
Orchis mascula (Early Purple Orchid)
Orchis purpurea (Lady Orchid)
Oreocarya (Perennial Cryptanthas)
Oreopanax
Oreopteris
Oreopteris limbosperma (Lemon-scented Fern)
Oreostemma
Oreostemma alpigenum (Alpine Aster)
Origanum (Marjorams)
Origanum dictamnus (dittany of Crete)
Origanum majorana (Sweet Marjoram)
Origanum vulgare (Oregano)
Origanum vulgare 'Aureum' (golden oregano)
Ornithogalum (star-of-Bethlehem)
Ornithogalum candicans (Summer hyacinth)
Ornithogalum umbellatum (common star-of-Bethlehem)
Ornithopus
Ornithopus perpusillus (Bird's-foot)
Orobanche (Broomrapes)
Orobanche hederae (ivy broomrape)
Orobanche minor (Common Broomrape)
Orthilia
Orthilia secunda (one-sided wintergreen)
Orthoceras
Orthoceras strictum (Birds mouth orchid)
Orthotrichum (Bristle mosses)
Orthotrichum anomalum (Anomalous Bristle-moss)
Orthotrichum diaphanum (White-tipped Bristle-moss)
Orthotrichum pulchellum (Elegant Bristle-moss)
Osmanthus (Sweet olives)
Osmanthus delavayi (Delavay osmanthus)
Osmanthus × fortunei (Fortune's Osmanthus)
Osmanthus fragrans (Sweet Osmanthus)
Osmanthus fragrans var. aurantiacus (Orange-Flowered Tea Olive)
Osmanthus heterophyllus (holly-leaved osmanthus)
Osmanthus heterophyllus 'Goshiki' (Goshiki holly-leaf osmanthus)
Osmanthus heterophyllus 'Variegatus' (Variegated holly osmanthus)
Osmanthus x burkwoodii (Burkwood osmanthus)
Osmorhiza (sweet cicely)
Osmorhiza berteroi (mountain sweet cicely)
Osmorhiza claytonii (hairy sweet cicely)
Osmorhiza longistylis (aniseroot)
Osmunda
Osmunda claytoniana (interrupted fern)
Osmunda regalis (Royal Fern)
Osmunda regalis 'Purpurascens' (Purple Royal Fern)
Osmunda spectabilis (American Royal Fern)
Osmundastrum
Osmundastrum cinnamomeum (Cinnamon Fern)
Osmundea
Osmundea pinnatifida (Pepper Dulse)
Osteospermum moniliferum (Bietou)
Ostrya
Ostrya virginiana (American hophornbeam)
Oxalis (Woodsorrels)
Oxalis acetosella (European wood-sorrel)
Oxalis articulata (pink-sorrel)
Oxalis corniculata (trailing yellow sorrel)
Oxalis debilis (Largeflower pink-sorrel)
Oxalis dillenii (slender yellow woodsorrel)
Oxalis exilis (least yellow-sorrel)
Oxalis incarnata (Pale pink-sorrel)
Oxalis montana (mountain woodsorrel)
Oxalis oregana (redwood sorrel)
Oxalis perennans (woody-root woodsorrel)
Oxalis pes-caprae (Bermuda buttercup)
Oxalis purpurea (Purple woodsorrel)
Oxalis smalliana (Redwood Sorrel)
Oxalis stricta (upright yellow woodsorrel)
Oxalis violacea (violet woodsorrel)
Oxybasis
Oxybasis rubra (red pigweed)
Oxydendrum
Oxydendrum arboreum (sourwood)
Oxylobium
Oxylobium ellipticum (golden shaggy-pea)
Oxyrrhynchium
Oxyrrhynchium hians (Swartz's Feather-moss)
Oxytropis (Locoweed)
Oxytropis lambertii (Lambert's Locoweed)
Ozothamnus
Ozothamnus diosmifolius (Sago Flower)
Ozothamnus ferrugineus (Tree Everlasting)
Ozothamnus obcordatus (Grey Everlasting)
Ozothamnus turbinatus (Coast Everlasting)
Pachira
Pachira aquatica (Money Tree)
Pachyphragma
Pachyphragma macrophyllum (giant spring brassica)
Pachysandra
Pachysandra terminalis (Japanese spurge)
Pachysandra terminalis 'Variegata' (Variegated Japanese spurge)
Packera (American groundsels and ragworts)
Packera anonyma (Small's ragwort)
Packera aurea (golden ragwort)
Packera glabella (Butterweed)
Packera obovata (roundleaf ragwort)
Paeonia (Peonies)
Paeonia 'Angel Cheeks' (Angel Cheeks Peony)
Paeonia 'Best Man' (Best Man Peony)
Paeonia 'Big Ben' (Big Ben Peony)
Paeonia 'Bowl of Beauty' (Bowl of Beauty Peony)
Paeonia 'Bowl of Cream' (Bowl of Cream Peony)
Paeonia 'Buckeye Belle'
Paeonia californica (California Peony)
Paeonia 'Coral Charm' (Coral Charm Peony)
Paeonia 'Cora Louise' (Cora Louise Itoh Peony)
Paeonia 'Coral Sunset' (Coral Sunset Peony)
Paeonia 'Felix Crousse' (Felix Crousse Peony)
Paeonia 'Kansas' (Kansas Peony)
Paeonia 'Krinkled White' (Krinkled White Peony)
Paeonia lactiflora (garden peony)
Paeonia lactiflora 'Alexander Fleming' (Alexander Fleming Peony)
Paeonia lactiflora 'Celebrity' (Celebrity Peony)
Paeonia lactiflora 'Duchesse de Nemours' (Duchesse de Nemours Peony)
Paeonia lactiflora 'Festiva Maxima' (Festiva Maxima Peony)
Paeonia lactiflora 'Gay Paree' (Gay Paree Peony)
Paeonia lactiflora 'Green Halo' (Green Halo Peony)
Paeonia lactiflora 'Jan van Leeuwen' (Jan van Leeuwen Peony)
Paeonia lactiflora 'Karl Rosenfeld' (Karl Rosenfeld Peony)
Paeonia lactiflora 'Pillow Talk' (Pillow Talk Peony)
Paeonia lactiflora 'Red Charm' (Red Charm Peony)
Paeonia lactiflora 'Sarah Bernhardt' (Sarah Bernhardt Peony)
Paeonia lactiflora 'Sorbet' (Sorbet Peony)
Paeonia lactiflora spp. (Bouquet Builders Peony Collection)
Paeonia lactiflora 'Sword Dance' (Sword Dance Peony)
Paeonia lactiflora 'White Wings'
Paeonia 'Lady Alexandra Duff' (Lady Alexandra Duff Peony)
Paeonia 'Madame Calot' (Madame Calot Peony)
Paeonia 'Madame de Verneville' (Madame de Verneville Peony)
Paeonia 'Many Happy Returns' (Many Happy Returns Peony)
Paeonia 'Miss America' (Miss America Peony)
Paeonia officinalis (common peony)
Paeonia 'Pink Hawaiian Coral' (Pink Hawaiian Coral Peony)
Paeonia 'Santa Fe' (Santa Fe Peony)
Paeonia 'Scarlet Heaven' (Scarlet Heaven Itoh Peony)
Paeonia ssp. (tree peony)
Paeonia 'Watermelon Wine' (Watermelon Wine Itoh Peony)
Paeonia x 'Bartzella' (Bartzella Peony)
Palicourea
Palmaria
Palmaria palmata (Dulse)
Panax
Panax trifolius (dwarf ginseng)
Pandanus (screwpines)
Pandanus tectorius (thatch screwpine)
Pandorea
Pandorea jasminoides (Bower Plant)
Pandorea pandorana (wonga vine)
Panicum (panicgrasses)
Panicum amarum (Bitter Panicgrass)
Panicum capillare (witch grass)
Panicum virgatum (Switchgrass)
Papaver (Poppies)
Papaver atlanticum (Atlas Poppy)
Papaver cambricum (welsh poppy)
Papaver dubium (Long-headed poppy)
Papaver orientale (Oriental poppy)
Papaver pilosum subsp. spicatum
Papaver rhoeas (common poppy)
Papaver rupifragum
Papaver somniferum (opium poppy)
Parahebe perfoliata (Koromiko)
Paraserianthes
Paraserianthes lophantha (Plume Albizia)
Paratrophis
Paratrophis pendulina (whalebone tree)
Parietaria (pellitories)
Parietaria judaica (pellitory-of-the-wall)
Parietaria pensylvanica (Pennsylvania pellitory)
Paris
Paris polyphylla (multi-leaf paris)
Paris quadrifolia (herb paris)
Parkinsonia (palo verde)
Parkinsonia aculeata (Mexican palo verde)
Parkinsonia florida (blue palo verde)
Parkinsonia microphylla (little-leaved palo verde)
Parnassia
Parnassia palustris (marsh grass-of-Parnassus)
Parrotia
Parrotia persica (Persian parrotia, ironwood)
Parsonsia
Parsonsia straminea (Common Silkpod)
Parthenium (wild quinines)
Parthenium hysterophorus (Santa Maria feverfew)
Parthenium integrifolium (wild quinine)
Parthenocissus (Virginia Creepers)
Parthenocissus inserta (thicket creeper)
Parthenocissus quinquefolia (Virginia creeper)
Parthenocissus tricuspidata (Boston ivy)
Paspalum (Paspalum)
Paspalum dilatatum (Dallis grass)
Paspalum notatum (Bahia Grass)
Paspalum urvillei (Vasey Grass)
Passerina (Gonnas)
Passiflora (Passionflowers)
Passiflora edulis (passion fruit)
Passiflora incarnata (purple passionflower)
Passiflora lutea (yellow passionflower)
Passiflora pallida (corkystem passionvine)
Passiflora suberosa (corkystem passionflower)
Passiflora subpeltata (white passionflower)
Patersonia
Patersonia fragilis (Short Purple-flag)
Patersonia glabrata (Leafy Purple Flag)
Patersonia occidentalis (Purple Flag)
Patersonia sericea (Silky Purple Flag)
Paulownia
Paulownia tomentosa (empress tree)
Pauridia
Pauridia vaginata (yellow star)
Pavonia (Swampmallows)
Pavonia hastata (Spearleaf Swampmallow)
Pavonia lasiopetala (Rose pavonia)
Paxistima
Paxistima myrsinites (Oregon Box)
Pedicularis (Louseworts)
Pedicularis canadensis (Canadian lousewort)
Pedicularis densiflora (Warrior's Plume)
Pedicularis groenlandica (Elephant's-Head lousewort)
Pedicularis palustris (Marsh Lousewort)
Pedicularis racemosa (Sickletop Lousewort)
Pedicularis sylvatica (Common Lousewort)
Pediocactus
Pediocactus simpsonii (Mountain Ball Cactus)
Pediomelum
Pediomelum tenuiflorum (Slimflower Scurfpea)
Pelargonium australe (Austral Stork's-bill)
Pelargonium capitatum (rose-scented geranium)
Pelargonium × domesticum (regal pelargonium)
Pelargonium × hybridum (garden geranium)
Pelargonium rodneyanum (magenta stork's-bill)
Pelazoneuron
Pelazoneuron kunthii (Widespread Maiden Fern)
Pellaea
Pellaea andromedifolia (Coffee Fern)
Pellaea atropurpurea (purple-stem cliffbrake)
Pellaea falcata (Sickle Fern)
Pellaea mucronata (bird's foot cliffbrake)
Pellaea rotundifolia (Button Fern)
Pellia (Pellia)
Pellia epiphylla (common pellia)
Peltandra
Peltandra virginica (Green Arrow Arum)
Pennisetum alopecuroides (Fountain Grass)
Penstemon (beardtongues)
Penstemon barrettiae (Barrett's Penstemon)
Penstemon cardwellii (Cardwell's Penstemon)
Penstemon centranthifolius (scarlet bugler)
Penstemon cobaea (cobaea beardtongue)
Penstemon davidsonii (Davidson's Penstemon)
Penstemon digitalis (foxglove beardtongue)
Penstemon digitalis 'Husker Red' (Husker Red Penstemon)
Penstemon eatonii (Firecracker Penstemon)
Penstemon fruticosus (Shrubby Penstemon)
Penstemon heterophyllus (Bunchleaf Penstemon)
Penstemon Hybrids (Beard Tongue)
Penstemon newberryi (Mountain Pride)
Penstemon ovatus (Broad-leafed Penstemon)
Penstemon pallidus (Pale Beardtongue)
Penstemon palmeri (Palmer's penstemon)
Penstemon procerus (Small-flowered Penstemon)
Penstemon pruinosus (Chelan Penstemon)
Penstemon rattanii (Rattan's Penstemon)
Penstemon 'Raven' (Raven Penstemon)
Penstemon richardsonii (Richardson's Penstemon)
Penstemon serrulatus (Coast Penstemon)
Penstemon smallii (Smalls Beardtongue)
Penstemon spectabilis (Showy Penstemon)
Penstemon strictus (Rocky Mt Penstemon)
Penstemon venustus (Blue Mt Penstemon)
Penstemon virens (Front Range Beardtongue)
Penstemon whippleanus (Whipple's penstemon)
Pentaglottis
Pentaglottis sempervirens (Green Alkanet)
Pentagramma
Pentagramma triangularis (goldback fern)
Pentanema
Pentanema squarrosum (Ploughman's-spikenard)
Pentas
Pentas lanceolata (Egyptian Star-cluster)
Penthorum
Penthorum sedoides (ditch stonecrop)
Peperomia (radiator plants)
Peperomia argyreia (Watermelon Peperomia)
Peperomia caperata 'Rosso' (Rosso Peperomia)
Peperomia leptostachya (Slender Peperomia)
Peperomia obtusifolia (Baby Rubber Plant)
Peperomia prostrata (String of Turtles)
Pericallis
Pericallis × hybrida (Florist's cineraria)
Perilla
Perilla frutescens (beefsteak plant)
Perityle
Perityle emoryi (Emory's rockdaisy)
Perovskia
Perovskia atriplicifolia 'Lacey Blue' (Lacey Blue Russian Sage)
Perovskia atriplicifolia 'Little Spire' (Little Spire Russian Sage)
Perovskia 'Filigran' (Filigran Russian Sage)
Perovskia 'Longin' (Longin Russian Sage)
Persea
Persicaria (knotweeds, smartweeds, and waterpeppers)
Persicaria amphibia (water smartweed)
Persicaria amplexicaulis 'Firetail' (Red knotweed)
Persicaria decipiens (slender knotweed)
Persicaria hydropiper (waterpepper)
Persicaria hydropiperoides (swamp smartweed)
Persicaria lapathifolia (dock-leaved smartweed)
Persicaria longiseta (low smartweed)
Persicaria microcephala 'Red Dragon' (Red Dragon Knotweed)
Persicaria pensylvanica (pinkweed)
Persicaria perfoliata (mile-a-minute weed)
Persicaria punctata (Dotted Smartweed)
Persicaria sagittata (arrow-leaved tearthumb)
Persoonia
Persoonia juniperina (Prickly Geebung)
Persoonia lanceolata (Lance-leaf Geebung)
Persoonia levis (Broad-leaf Geebung)
Persoonia linearis (Narrow-leaf Geebung)
Persoonia pinifolia (Pine-leaf Geebung)
Persoonia virgata (small-leaved geebung)
Petalostigma
Petalostigma pubescens (quinine bush)
Petasites (Butterburs)
Petasites albus (White Butterbur)
Petasites frigidus (coltsfoot)
Petasites hybridus (Common Butterbur)
Petasites japonicus (fuki,butterburr)
Petasites pyrenaicus (Winter Heliotrope)
Petrophile
Petrophile pulchella (Conesticks)
Petrosedum
Petrosedum rupestre (Reflexed Stonecrop)
Petunia × atkinsiana (garden petunia)
Peucedanum
Peucedanum verticillare
Phacelia (Scorpionweeds)
Phacelia bipinnatifida (Purple Phacelia)
Phacelia californica (California phacelia)
Phacelia campanularia (desert bluebells)
Phacelia cicutaria (caterpillar scorpionweed)
Phacelia congesta (Blue Curls)
Phacelia crenulata (Notch-leaf Scorpionweed)
Phacelia distans (distant phacelia)
Phacelia hastata (Silverleaf phacelia)
Phacelia imbricata (Mountain Phacelia)
Phacelia minor (wild canterbury bells)
Phacelia nemoralis (Shade Phacelia)
Phacelia parryi (Parry's phacelia)
Phacelia purshii (Miami Mist)
Phacelia ramosissima (branching phacelia)
Phacelia sericea (Silky Phacelia)
Phacelia tanacetifolia (Lacy phacelia)
Phalaenopsis (Moth Orchid)
Phalaris (Canarygrasses)
Phalaris aquatica (harding grass)
Phalaris arundinacea (reed canary grass)
Phaseolus (beans)
Phaseolus vulgaris 'Blue Lake' (Blue Lake Green Bean)
Phaseolus vulgaris 'Kentucky Wonder' (Kentucky Wonder Bean)
Phaseolus vulgaris 'Provider' (Provider Bush Bean)
Phebalium
Phebalium squamulosum (scaly phebalium)
Phedimus (False Stonecrops)
Phedimus kamtschaticus (Orange Stonecrop)
Phedimus selskianus (Selsky Stonecrop)
Phegopteris
Phegopteris connectilis (long beech fern)
Phegopteris decursive-pinnata (Japanese Beech Fern)
Phegopteris hexagonoptera (broad beech fern)
Pheladenia
Pheladenia deformis (Blue Fairy Orchid)
Phelipanche
Philadelphus (mock oranges)
Philadelphus coronarius 'Aureus' (Golden Mock Orange)
Philadelphus lewisii (Lewis' Mock Orange)
Philadelphus 'Snowbelle' (Snowbelle Mock Orange)
Philadelphus spp. (mock orange)
Philodendron (philodendrons)
Philodendron erubescens 'Pink Princess' (Pink Princess Philodendron)
Philodendron gloriosum (Glorious Philodendron)
Philodendron hastatum (Silver Sword Philodendron)
Philodendron hederaceum (Heartleaf Philodendron)
Philodendron 'Moonlight' (Moonlight Philodendron)
Philodendron 'Prince of Orange' (Prince of Orange Philodendron)
Philodendron 'Rojo Congo' (Rojo Congo Philodendron)
Philodendron rugosum (Philodendron Pig Skin)
Philydrum
Philydrum lanuginosum (woolly frog's-mouth)
Phlebodium
Phlebodium aureum (Blue Star Fern)
Phleum (Timothies)
Phleum pratense (Timothy grass)
Phlomis (Lampwicks)
Phlomis italica
Phlomis russeliana (Jerusalem sage)
Phlox (phloxes)
Phlox diffusa (spreading phlox)
Phlox divaricata (Woodland Phlox)
Phlox divaricata 'Blue Moon' (Blue Moon Woodland Phlox)
Phlox divaricata 'May Breeze' (May Breeze Woodland Phlox)
Phlox drummondii (Drummond's phlox)
Phlox hoodii (spiny phlox)
Phlox longifolia (Longleaf Phlox)
Phlox paniculata (Garden Phlox)
Phlox paniculata 'Blue Paradise'
Phlox paniculata spp. (Tall Phlox Mix)
Phlox pilosa (prairie phlox)
Phlox subulata 'Amazing Grace' (Amazing Grace Creeping Phlox)
Phlox subulata 'Candy Stripe' (Candy Stripe Creeping Phlox)
Phlox subulata 'Emerald Blue' (Emerald Blue Creeping Phlox)
Phlox subulata 'Emerald Pink' (Emerald Pink Creeping Phlox)
Phlox subulata 'Fort Hill' (Fort Hill Creeping Phlox)
Phlox subulata 'Purple Beauty' (Purple Beauty Creeping Phlox)
Phlox subulata 'Scarlet Flame' (Scarlet Flame Carpet Phlox)
Phlox subulata 'Snowflake' (Snowflake Creeping Phlox)
Phoenix (date palms)
Phoenix canariensis (Canary Island palm)
Phoenix roebelenii (Pygmy Date Palm)
Phoenix sylvestris (Silver Date Palm)
Pholistoma
Pholistoma auritum (Fiesta Flower)
Phoradendron (leafy mistletoes)
Phoradendron californicum (Mesquite Mistletoe)
Phoradendron leucarpum (American Mistletoe)
Phormium (New Zealand flaxes)
Photinia (Christmas berries)
Photinia davidiana (tall stranvaesia)
Photinia × fraseri (Red Tip Photinia)
Photinia serratifolia (Chinese Photinia)
Photinia x fraseri (Red tip photinia)
Phragmites
Phragmites australis (common reed)
Phryma
Phryma leptostachya (American lopseed)
Phygelius
Phygelius x rectus (Cape Fuchsia)
Phygelius x rectus Hybrids (cape fuchsia)
Phyla (frogfruits)
Phyla lanceolata (lanceleaf frogfruit)
Phyla nodiflora (turkey tangle frogfruit)
Phylica (Hardleaves)
Phyllanthus
Phyllanthus calycinus (False Boronia)
Phyllanthus hirtellus (Thyme Spurge)
Phyllanthus urinaria (Chamberbitter)
Phyllodoce
Phyllodoce empetriformis (pink mountainheath)
Phyllospadix (surfgrasses)
Phyllospadix torreyi (Torrey's Surfgrass)
Phyllostachys
Phyllostachys aurea (golden bamboo)
Phyllostachys nigra (black bamboo)
Phyllota
Phyllota phylicoides (Common Phyllota)
Phyllota pleurandroides (Heathy Phyllota)
Physalis (groundcherries)
Physalis angulata (cutleaf groundcherry)
Physalis crassifolia (Thickleaf Groundcherry)
Physalis × elliottii
Physalis heterophylla (clammy groundcherry)
Physalis longifolia (long-leaved groundcherry)
Physaria (bladderpods)
Physocarpus (ninebarks)
Physocarpus capitatus (Pacific ninebark)
Physocarpus opulifolius 'Diabolo' (Diabolo Ninebark)
Physocarpus opulifolius 'Monlo' (Diabolo® ninebark)
Physocarpus opulifolius 'Seward' (Summer Wine Ninebark)
Physostegia (dragonheads and obedient plants)
Physostegia virginiana (Obedient Plant)
Phyteuma
Phyteuma scheuchzeri (Oxford Rampion)
Phytolacca (Pokeweeds)
Phytolacca americana (American pokeweed)
Phytolacca octandra (Inkweed)
Picea (spruces)
Picea abies (Norway Spruce)
Picea abies 'Little Gem' (Little Gem Norway Spruce)
Picea abies 'Nidiformis' (bird's nest spruce)
Picea abies 'Pendula' (Weeping Norway Spruce)
Picea abies 'Pusch' (Pusch Norway Spruce)
Picea abies 'Reflexa' (weeping Norway spruce)
Picea × albertiana (Interior Spruce)
Picea engelmannii (Engelmann spruce)
Picea glauca (white spruce)
Picea glauca 'Conica' (Dwarf Alberta Spruce)
Picea glauca 'Pendula' (Weeping White Spruce)
Picea mariana (black spruce)
Picea meyeri (Meyer Spruce)
Picea omorika (Serbian Spruce)
Picea orientalis (Oriental spruce)
Picea orientalis 'Aurea' (Golden Oriental Spruce)
Picea orientalis 'Aureospicata' (Golden Oriental Spruce)
Picea pungens (Colorado Spruce)
Picea pungens 'Glauca' (Colorado Blue Spruce)
Picea pungens 'Montgomery' (Montgomery Blue Spruce)
Picea rubens (red spruce)
Picea sitchensis (Sitka Spruce)
Picris
Picris hieracioides (Hawkweed Oxtongue)
Pieris
Pieris 'Brouwer's Beauty' (Brouwer's Beauty Pieris)
Pieris japonica 'Cavatine' (Cavatine Japanese Pieris)
Pieris japonica 'Dorothy Wyckoff' (Dorothy Wyckoff Pieris)
Pieris japonica 'Flamingo' (Flamingo Japanese Pieris)
Pieris japonica 'Flaming Silver' (Flaming Silver Pieris)
Pieris japonica 'Forest Flame' (Japanese andromeda)
Pieris japonica 'Little Heath' (Little Heath Pieris)
Pieris japonica 'Mountain Fire' (Pieris Mountain Fire)
Pieris japonica 'Nocturne' (Nocturne Japanese Pieris)
Pieris japonica 'Sarabande' (Sarabande Japanese Pieris)
Pieris japonica 'Valley Rose' (Valley Rose Pieris)
Pieris japonica 'Valley Valentine' (Valley Valentine Pieris)
Pieris japonica 'Variegata' (Variegated Japanese Pieris)
Pigea
Pigea monopetala (Lady's Slipper)
Pigea stellarioides (spade flower)
Pilea (Clearweeds)
Pilea matsudae
Pilea microphylla (Artillery Plant)
Pilea peperomioides (Pilea Peperomioides)
Pilea pumila (Canada clearweed)
Pilosella (mouse-ear hawkweeds)
Pilosella aurantiaca (orange hawkweed)
Pilosella caespitosa (meadow hawkweed)
Pilosella officinarum (mouse-eared hawkweed)
Pimelea (riceflowers)
Pimelea curviflora (curved rice-flower)
Pimelea glauca (smooth riceflower)
Pimelea humilis (Common Rice-flower)
Pimelea linifolia (Queen of the Bush)
Pimelea octophylla (Woolly Rice-flower)
Pimelea prostrata
Pimpinella
Pimpinella saxifraga (Burnet-saxifrage)
Pinguicula
Pinguicula vulgaris (Common Butterwort)
Pinus (pines)
Pinus aristata (Bristlecone Pine)
Pinus brachyptera (Southwestern Ponderosa Pine)
Pinus bungeana (Lacebark Pine)
Pinus cembra (Swiss stone pine)
Pinus clausa (sand pine)
Pinus contorta 'Taylor's Sunburst' (Taylor's Sunburst Lodgepole Pine)
Pinus contorta var. contorta (Shore Pine)
Pinus contorta var. latifolia (Lodgepole Pine)
Pinus densiflora (Japanese Red Pine)
Pinus densiflora 'Umbraculifera' (Japanese Umbrella Pine)
Pinus echinata (shortleaf pine)
Pinus edulis (Colorado Pinyon)
Pinus elliottii (slash pine)
Pinus flexilis (limber pine)
Pinus jeffreyi (Jeffrey Pine)
Pinus × kohae (Arizona Singleleaf Pinyon)
Pinus longaeva (Great Basin bristlecone pine)
Pinus monophylla (singleleaf pinyon)
Pinus monticola (Western White Pine)
Pinus mugo (mugo pine)
Pinus mugo 'Slowmound' (Dwarf Mugo Pine)
Pinus nigra (Austrian Pine)
Pinus palustris (longleaf pine)
Pinus parviflora (Japanese White Pine)
Pinus parviflora 'Glauca' (Blue Japanese White Pine)
Pinus ponderosa (Ponderosa Pine)
Pinus scopulorum (Rocky Mountains Ponderosa Pine)
Pinus strobus (eastern white pine)
Pinus strobus 'Nana' (Dwarf White Pine)
Pinus sylvestris (Scots Pine)
Pinus sylvestris 'Fastigiata' (Columnar Scots Pine)
Pinus sylvestris 'Watereri' (Waterer Scots Pine)
Pinus taeda (Loblolly Pine)
Pinus thunbergii (Japanese Black Pine)
Pinus thunbergii 'Thunderhead' (Thunderhead Japanese black pine)
Pinus torreyana (Torrey pine)
Pinus wallichiana (Himalayan Pine)
Piper (pepper plants)
Piper hederaceum (Australian Pepper Vine)
Piper nigrum (Black Pepper Plant)
Pistacia (pistaches)
Pistacia chinensis (Chinese pistache)
Pistacia lentiscus (mastic)
Pistia
Pistia stratiotes (Water Lettuce)
Pithecellobium (Blackbeads)
Pittosporum (Cheesewoods)
Pittosporum angustifolium (Native apricot)
Pittosporum bicolor (Banyalla)
Pittosporum multiflorum (orange thorn)
Pittosporum revolutum (Rough-fruited Pittosporum)
Pittosporum tenuifolium (pittosporum tenuifolium)
Pittosporum tobira (Japanese pittosporum)
Pittosporum undulatum (Australian Cheesewood)
Pityopsis (Silkgrasses)
Plagiobothrys (Popcornflowers)
Plagiobothrys nothofulvus (Rusty Popcornflower)
Plagiochila
Plagiomnium (Thyme and Allied Mosses)
Plagiomnium cuspidatum (Woodsy Thyme-moss)
Plagiomnium undulatum (Palm-tree Moss)
Plagiothecium
Plagiothecium undulatum (Waved Silk-moss)
Plantago (plantains)
Plantago aristata (bracted plantain)
Plantago coronopus (Buck's-horn Plantain)
Plantago erecta (dot-seed plantain)
Plantago lanceolata (English plantain)
Plantago major (common plantain)
Plantago maritima (Sea Plantain)
Plantago media (Hoary Plantain)
Plantago patagonica
Plantago rhodosperma (redseed plantain)
Plantago rugelii (American plantain)
Plantago virginica (dwarf plantain)
Platanthera (Bog Orchids)
Platanthera chlorantha (Greater butterfly-orchid)
Platanthera dilatata (white bog orchid)
Platanus (planes)
Platanus × acerifolia (London plane tree)
Platanus × hispanica (London Plane)
Platanus occidentalis (American Sycamore)
Platanus orientalis (Oriental Plane)
Platanus racemosa (California Sycamore)
Platanus wrightii (Arizona sycamore)
Platycerium (staghorn ferns)
Platycerium bifurcatum (Staghorn Fern)
Platycerium superbum (Stag Horn Fern)
Platycladus
Platycladus orientalis (Oriental Arborvitae)
Platycladus orientalis 'Aurea Nana' (Berckmans Gold Arborvitae)
Platylobium
Platylobium formosum (Handsome Flat Pea)
Platylobium obtusangulum (Common Flat-pea)
Platysace
Platysace lanceolata (Shrubby Platysace)
Platysace linearifolia (Carrot Tops)
Platystemon
Platystemon californicus (creamcups)
Plectocephalus
Plectocephalus americanus (American basketflower)
Plectranthus (spurflowers)
Plectritis
Plectritis congesta (shortspur seablush)
Pleioblastus
Pleioblastus pygmaeus (dwarf bamboo)
Plenogemma
Plenogemma phyllantha (Frizzled Pincushion)
Pleopeltis
Pleopeltis michauxiana (resurrection fern)
Pleroma (glory bushes and allies)
Pleurothallis
Pleurozium
Pleurozium schreberi (Red-stemmed Feather Moss)
Pluchea (marsh fleabanes)
Pluchea baccharis (Rosy Camphorweed)
Pluchea camphorata (Camphor-weed)
Pluchea odorata (marsh fleabane)
Pluchea sericea (arrowweed)
Plumbago (plumbagos)
Plumeria (Frangipani Trees)
Plumeria rubra (Plumeria)
Poa (Meadow-grasses)
Poa annua (annual bluegrass)
Poa bulbosa (Bulbous Bluegrass)
Poa labillardierei (common tussock grass)
Poa pratensis (Kentucky Bluegrass)
Poa trivialis (Rough Meadow-grass)
Podocarpus (plum pines)
Podocarpus elatus (Plum Pine)
Podocarpus lawrencei (Mountain Plum Pine)
Podocarpus macrophyllus (Buddhist pine)
Podocarpus nivalis (Snow Totara)
Podolobium
Podolobium ilicifolium (Prickly Shaggy Pea)
Podophyllum
Podophyllum peltatum (mayapple)
Podophyllum pleianthum (Chinese mayapple)
Podophyllum 'Spotty Dotty' (Spotty Dotty mayapple)
Podosphaera
Podosphaera xanthii (Cucurbit Powdery Mildew)
Pogonia
Pogonia ophioglossoides (Rose Pogonia)
Polanisia
Polanisia dodecandra (redwhisker clammyweed)
Polemonium (Jacob's ladders)
Polemonium caeruleum 'Snow and Sapphires' (Snow and Sapphires Jacob's Ladder)
Polemonium reptans (Jacob's ladder)
Polycarpon
Polycarpon tetraphyllum (fourleaf manyseed)
Polygala (Milkworts)
Polygala myrtifolia (Sweet Pea Shrub)
Polygala serpyllifolia (Heath Milkwort)
Polygala vulgaris (Common Milkwort)
Polygaloides
Polygaloides paucifolia (fringed polygala)
Polygonatum (Solomon's seal)
Polygonatum biflorum (Solomons Seal)
Polygonatum multiflorum (Solomon's-seal)
Polygonatum odoratum (Solomon's Seal)
Polygonatum odoratum 'Variegatum' (Variegated Solomon's Seal)
Polygonatum pubescens (hairy Solomon's-seal)
Polygonatum verticillatum
Polygonatum x hybridum
Polygonum (knotweeds)
Polygonum arenastrum (Oval Leaf Knotweed)
Polygonum aviculare (common knotweed)
Polylepis (queñua and allies)
Polymeria
Polymeria calycina (slender bindweed)
Polymnia
Polymnia canadensis (leafcup)
Polypodium (polypody ferns)
Polypodium californicum (California Polypody)
Polypodium glycyrrhiza (licorice fern)
Polypodium interjectum (intermediate polypody)
Polypodium scouleri (Scouler's Polypody)
Polypodium virginianum (rock polypody)
Polypodium vulgare (common polypody)
Polypogon
Polypogon monspeliensis (rabbitfoot grass)
Polypogon viridis (water beard grass)
Polypremum
Polypremum procumbens (Rust Weed)
Polyscias
Polyscias elegans (celery wood)
Polyscias sambucifolia (Elderberry Panax)
Polystichum (shield ferns)
Polystichum acrostichoides (Christmas Fern)
Polystichum aculeatum (hard shield fern)
Polystichum munitum (Western sword fern)
Polystichum polyblepharum (Korean tassel fern)
Polystichum proliferum (mother shield-fern)
Polystichum setiferum (soft shield fern)
Polystichum setiferum 'Herrenhausen'
Polytaenia
Polytaenia texana (Texas Prairie Parsley)
Polytrichum (haircap mosses)
Polytrichum commune (Common Haircap Moss)
Polytrichum formosum (Bank Haircap Moss)
Polytrichum juniperinum (juniper haircap moss)
Polytrichum piliferum (bristly haircap moss)
Pomaderris
Pomaderris apetala (Tainui)
Pomaderris aspera (Hazel Pomaderris)
Pomax
Pomax umbellata (pomax)
Pontederia (Pickerel Weeds)
Pontederia cordata (pickerelweed)
Pontederia crassipes (common water hyacinth)
Populus (poplars, cottonwoods, and aspens)
Populus × acuminata (lanceleaf cottonwood)
Populus alba (white poplar)
Populus angustifolia (Narrowleaf Cottonwood)
Populus balsamifera ssp. trichocarpa (black cottonwood)
Populus deltoides (Eastern Cottonwood)
Populus fremontii (Frémont Cottonwood)
Populus grandidentata (bigtooth aspen)
Populus nigra 'Italica' (Lombardy poplar)
Populus × rouleauana (Rouleau's Poplar)
Populus tremula (European aspen)
Populus tremuloides (quaking aspen)
Populus trichocarpa (cottonwood)
Poranthera
Poranthera microphylla (Small Poranthera)
Porella
Portulaca (purslanes)
Portulaca oleracea (purslane)
Portulaca pilosa (shaggy portulaca)
Portulacaria (Spekbooms)
Portulacaria afra (Jade Plant)
Posidonia
Posidonia australis (fibre-ball weed)
Potamogeton (Pondweeds)
Potamogeton natans (floating-leaved pondweed)
Potamogeton polygonifolius (Bog Pondweed)
Potentilla (cinquefoils)
Potentilla anglica (English cinquefoil)
Potentilla anserina (Pacific Silverweed)
Potentilla argentea (Silvery Cinquefoil)
Potentilla atrosanguinea (red cinquefoil)
Potentilla canadensis (dwarf cinquefoil)
Potentilla erecta (Tormentil)
Potentilla fruticosa (Shrubby Cinquefoil)
Potentilla gelida (silvery cinquefoil)
Potentilla gracilis (Slender Cinquefoil)
Potentilla indica (mock strawberry)
Potentilla nepalensis 'Miss Willmott'
Potentilla norvegica (rough cinquefoil)
Potentilla palustris
Potentilla recta (sulfur cinquefoil)
Potentilla recta var. sulphurea
Potentilla reptans (Creeping cinquefoil)
Potentilla simplex (common cinquefoil)
Potentilla sterilis (Barren Strawberry)
Pothos
Pothos longipes (candle vine)
Prasophyllum
Prasophyllum elatum (Tall Leek Orchid)
Pratia
Pratia pedunculata (Blue Star Creeper)
Praxelis
Praxelis clematidea (pussyfoot)
Primula (polyanthus)
Primula acaulis (stemless primrose)
Primula clevelandii (Padre's Shooting Star)
Primula hendersonii (Henderson's shooting star)
Primula kisoana (Kisan primrose)
Primula meadia (eastern shooting star)
Primula pauciflora (dark-throated shooting star)
Primula pulverulenta
Primula sieboldii (sakura)
Primula veris (Cowslip)
Prosartes (American fairybells)
Prosartes hookeri (Hooker's Fairy Bells)
Prosartes smithii (Largeflower Fairybells)
Prostanthera
Prostanthera cuneata (alpine mint bush)
Prostanthera lasianthos (Christmas Bush)
Protea
Protea × hybrida (Sugarbush Hybrids)
Prunella (selfheals)
Prunella vulgaris (self heal)
Prunus (plums, cherries, and allies)
Prunus americana (American plum)
Prunus angustifolia (Chickasaw plum)
Prunus armeniaca 'Moorpark' (Moorpark Apricot)
Prunus caroliniana (Carolina laurelcherry)
Prunus cerasifera (purple leaf plum, cherry plum)
Prunus cerasifera 'Thundercloud' (Thundercloud Plum)
Prunus cerasus 'Montmorency' (Montmorency Cherry)
Prunus cerasus 'North Star' (North Star Cherry)
Prunus × cistena (Purple-leaved Sand Cherry)
Prunus domestica (European plum)
Prunus emarginata (Bitter Cherry)
Prunus ilicifolia (hollyleaf cherry)
Prunus insititia (Damson)
Prunus 'Kanzan' (Kwanzan flowering cherry)
Prunus laurocerasus (English laurel)
Prunus laurocerasus 'Mt. Vernon' (Mt. Vernon laurel)
Prunus laurocerasus 'Otto Luyken' (Otto Luyken Laurel)
Prunus laurocerasus 'Schipkaensis' (Skip Laurel)
Prunus laurocerasus 'Zabeliana' (Zabel laurel)
Prunus lusitanica (Portuguese laurel)
Prunus maritima (Beach Plum)
Prunus mexicana (Mexican Plum)
Prunus padus (bird cherry)
Prunus pensylvanica (fire cherry)
Prunus salicina 'Satsuma' (Satsuma Plum)
Prunus serotina (Black Cherry)
Prunus serrulata ((in the Sato-Zakura group))
Prunus 'Shirotae' (Mt. Fuji flowering cherry)
Prunus spinosa (Blackthorn)
Prunus subhirtella 'Autumnalis' (Autumn Cherry Tree)
Prunus subhirtella 'Pendula' (weeping flowering cherry)
Prunus subhirtella 'Pendula Plena Rosea' (Double Pink Weeping Cherry Tree)
Prunus virginiana (Chokecherry)
Prunus × yedoensis (Yoshino flowering cherry)
Pseudanomodon
Pseudanomodon attenuatus (tree-skirt moss)
Pseuderanthemum
Pseuderanthemum variabile (Pastel Flower)
Pseudisothecium
Pseudisothecium myosuroides (Mouse-tail Moss)
Pseudisothecium stoloniferum (Cat's Tail Moss)
Pseudodictamnus
Pseudodictamnus mediterraneus
Pseudofumaria
Pseudofumaria lutea (Yellow Fumitory)
Pseudognaphalium (rabbit-tobaccos)
Pseudognaphalium biolettii (two-color rabbit tobacco)
Pseudognaphalium californicum (California cudweed)
Pseudognaphalium luteoalbum (Jersey Cudweed)
Pseudognaphalium obtusifolium (sweet everlasting)
Pseudognaphalium stramineum (cottonbatting plant)
Pseudogynoxys
Pseudogynoxys chenopodioides (Mexican Flame Vine)
Pseudosasa
Pseudosasa japonica (Arrow Bamboo)
Pseudoscleropodium
Pseudoscleropodium purum (Neat Feather-moss)
Pseudotrillium
Pseudotrillium rivale (brook wakerobin)
Pseudotsuga (Douglas-firs)
Pseudotsuga menziesii (Douglas fir)
Pseudotsuga menziesii 'Graceful Grace' (Graceful Grace Douglas Fir)
Pseudotsuga menziesii 'Pendula' (weeping Douglas fir)
Pseudotsuga menziesii var. glauca (Rocky Mountain Douglas fir)
Psidium (guavas)
Psidium guajava (White Guava)
Psilotum
Psilotum nudum (skeleton fork fern)
Psorodendron
Psorodendron schottii (indigo-bush)
Psorodendron spinosum (Smoketree)
Psychotria (wild coffees)
Psychotria loniceroides (Hairy Psychotria)
Psychotria nervosa (Shiny-leaved Wild Coffee)
Psydrax
Psydrax odoratus (Lamboto)
Ptelea
Ptelea trifoliata (common hoptree)
Pteridium (brackens)
Pteridium aquilinum (bracken fern)
Pteridium esculentum (Austral Bracken)
Pteris (brakes)
Pteris tremula (Shaking Brake)
Pterocarya fraxinifolia (Caucasian Wingnut)
Pterocaulon
Pterocaulon pycnostachyum (blackroot)
Pterospora
Pterospora andromedea (woodland pinedrops)
Pterostylis (Greenhoods)
Pterostylis alpina (Australian mountain greenhood)
Pterostylis concinna (Trim Greenhood)
Pterostylis curta (blunt greenhood)
Pterostylis grandiflora (cobra greenhood)
Pterostylis melagramma (tall greenhood)
Pterostylis nana (dwarf greenhood)
Pterostylis nutans (Nodding Greenhood)
Pterostylis parviflora (tiny greenhood)
Pterostylis pedunculata (maroonhood)
Pterostylis recurva (jug orchid)
Pterostylis sanguinea (Red-banded Greenhood)
Pterostylis vittata (Banded Greenhood)
Ptilimnium
Ptilimnium capillaceum (herbwilliam)
Ptilotus
Ptilotus exaltatus (Pink Mulla Mulla)
Ptilotus obovatus (cotton bush)
Ptilotus polystachyus (Prince of Wales Feather)
Ptychomnion
Ptychomnion aciculare (pipe-cleaner moss)
Ptychostomum
Ptychostomum capillare (Capillary Thread-moss)
Pueraria
Pueraria montana (kudzu)
Pulicaria
Pulicaria dysenterica (Common Fleabane)
Pullenia
Pullenia gunnii (slender tick-trefoil)
Pulmonaria (lungwort)
Pulmonaria obscura (Suffolk Lungwort)
Pulmonaria officinalis (Lungwort)
Pulmonaria × 'Trevi Fountain' (Trevi Fountain Lungwort)
Pulsatilla (pasqueflowers)
Pulsatilla nuttalliana (prairie pasqueflower)
Pulsatilla occidentalis (Western pasqueflower)
Pulsatilla patens (Eastern Pasque Flower)
Pulsatilla vulgaris (common pasqueflower)
Pultenaea (Bush-peas)
Pultenaea daphnoides (Large-leaf Bush Pea)
Pultenaea gunnii (golden bush-pea)
Pultenaea juniperina (prickly beauty)
Pultenaea pedunculata (matted bush-pea)
Pultenaea retusa (Notched Bush-pea)
Pultenaea scabra (Rough Bush-pea)
Pultenaea tuberculata (Wreath Bush-pea)
Pultenaea villosa (Hairy Bush-pea)
Pulvigera
Purshia
Purshia stansburyana (Stansbury's Cliffrose)
Purshia tridentata (Antelope Bitterbrush)
Puya
Pycnanthemum (mountain mints)
Pycnanthemum muticum (Short-Toothed Mountain Mint)
Pycnanthemum pilosum (Hairy Mountain Mint)
Pycnanthemum tenuifolium (narrowleaf mountainmint)
Pycnanthemum virginianum (Virginia Mountain Mint)
Pyracantha (firethorns)
Pyracantha coccinea (Scarlet Firethorn)
Pyracantha spp. (firethorn pyracantha)
Pyrola (wintergreens)
Pyrola americana (American wintergreen)
Pyrola asarifolia (bog wintergreen)
Pyrola elliptica (shinleaf)
Pyrola picta (white-veined wintergreen)
Pyrorchis
Pyrorchis nigricans (Red Beaks)
Pyrrhopappus (desert-chicories)
Pyrrhopappus carolinianus (Carolina desert-chicory)
Pyrrhopappus pauciflorus (smallflower desert-chicory)
Pyrrosia (Felt Ferns)
Pyrrosia rupestris (Rock Felt Fern)
Pyrus calleryana (Callery flowering pear)
Pyrus salicifolia 'Pendula' (Weeping Silver Pear)
Quercus (oaks)
Quercus × acutidens (Torrey's Hybrid Oak)
Quercus agrifolia (Coast Live Oak)
Quercus alba (White Oak)
Quercus × alvordiana (Alvord Oak)
Quercus berberidifolia (California scrub oak)
Quercus bicolor (Swamp White Oak)
Quercus buckleyi (Buckley's oak)
Quercus cerris (Turkey Oak)
Quercus coccinea (scarlet oak)
Quercus douglasii (blue oak)
Quercus durata (Leather Oak)
Quercus × eplingii (Epling's Oak)
Quercus × ewanii (Ewan's Oak)
Quercus falcata (Southern Red Oak Tree)
Quercus frainetto (Hungarian oak)
Quercus fusiformis (Texas live oak)
Quercus gambelii (Gambel Oak)
Quercus × ganderi (Gander oak)
Quercus garryana (Oregon white oak, Garry oak)
Quercus geminata (sand live oak)
Quercus hemisphaerica (Darlington Oak)
Quercus ilex (holly oak)
Quercus ilicifolia (bear oak)
Quercus × jolonensis (Jolon Oak)
Quercus kelloggii (Black Oak)
Quercus laevis (American turkey oak)
Quercus laurifolia (swamp laurel oak)
Quercus lobata (Valley Oak)
Quercus lyrata (overcup oak)
Quercus macrocarpa (Bur Oak)
Quercus marilandica (blackjack oak)
Quercus michauxii (swamp chestnut oak)
Quercus montana (chestnut oak)
Quercus × morehus (Oracle Oak)
Quercus muehlenbergii (chinkapin oak)
Quercus myrtifolia (Myrtle Oak)
Quercus nigra (water oak)
Quercus palustris (pin oak)
Quercus petraea (sessile oak)
Quercus robur (English oak)
Quercus robur 'Concordia' (Golden Oak)
Quercus rotundifolia (sweet acorn oak)
Quercus rubra (red oak)
Quercus sadleriana (Sadler's Oak)
Quercus × saulii (Saul's oak)
Quercus shumardii (Shumard Oak Tree)
Quercus stellata (post oak)
Quercus suber (cork oak)
Quercus texana (Nuttall Oak Tree)
Quercus turbinella (Sonoran scrub oak)
Quercus × undulata (Wavyleaf Oak)
Quercus vacciniifolia (Huckleberry Oak)
Quercus velutina (black oak)
Quercus virginiana (Southern Live Oak)
Quercus wislizeni (Interior Live Oak)
Rabelera
Rabelera holostea (greater stitchwort)
Racomitrium
Racomitrium lanuginosum (Woolly Fringe-moss)
Radula
Radula complanata (Flat-leaved Scalewort)
Rafinesquia
Rafinesquia neomexicana (Desert Chicory)
Ranunculus (buttercups)
Ranunculus abortivus (small-flowered buttercup)
Ranunculus acris (meadow buttercup)
Ranunculus aquatilis (common water-crowfoot)
Ranunculus asiaticus (Persian Buttercup)
Ranunculus auricomus (Goldilocks Buttercup)
Ranunculus bulbosus (bulbous buttercup)
Ranunculus californicus (California buttercup)
Ranunculus fascicularis (Early Buttercup)
Ranunculus flammula (Lesser Spearwort)
Ranunculus glaberrimus (sagebrush buttercup)
Ranunculus lappaceus (Australian Buttercup)
Ranunculus lingua (Greater Spearwort)
Ranunculus muricatus (Rough-fruited buttercup)
Ranunculus occidentalis (Western Buttercup)
Ranunculus omiophyllus (Round-leaved Crowfoot)
Ranunculus recurvatus (Hooked buttercup)
Ranunculus repens (creeping buttercup)
Ranunculus sardous (hairy buttercup)
Ranunculus sceleratus (cursed crowfoot)
Raphanus (Radishes)
Raphanus raphanistrum (Wild radish)
Rapistrum
Rapistrum rugosum (annual bastard cabbage)
Ratibida
Ratibida columnifera (upright prairie coneflower)
Ratibida pinnata (grey-headed coneflower)
Ravenala
Ravenea
Ravenea rivularis (Majesty Palm)
Reseda (mignonettes)
Reseda lutea (Wild Mignonette)
Reseda luteola (Weld)
Reynoutria (Rhizomatous Knotweeds)
Reynoutria × bohemica (Bohemian Knotweed)
Reynoutria japonica (Japanese knotweed)
Rhagodia
Rhagodia candolleana (Seaberry Saltbush)
Rhamnus (Buckthorns)
Rhamnus cathartica (common buckthorn)
Rhamnus crocea (Redberry Buckthorn)
Rhamnus ilicifolia (hollyleaf redberry)
Rhaphiolepis
Rhaphiolepis indica (Indian Hawthorn)
Rhaphiolepis umbellata 'Minor' (rhaphiolepis)
Rhapidophyllum
Rhapidophyllum hystrix (Needle Palm)
Rhapis
Rhapis excelsa (Lady Palm Tree)
Rheum
Rheum palmatum 'Atrosanguineum' (ornamental rhubarb)
Rheum rhabarbarum (Rhubarb)
Rhexia (Meadowbeauties)
Rhexia mariana (Maryland meadowbeauty)
Rhexia virginica (Virginia meadowbeauty)
Rhinanthus (Rattles)
Rhinanthus minor (Yellow Rattle)
Rhinotropis
Rhinotropis californica (California milkwort)
Rhizomnium
Rhizomnium punctatum (Dotted Thyme-moss)
Rhizophora (true mangroves)
Rhizophora mangle (red mangrove)
Rhizophora stylosa (spotted mangrove)
Rhodamnia
Rhodamnia rubescens (scrub turpentine)
Rhodiola
Rhodiola integrifolia (western roseroot)
Rhodiola rosea (Roseroot)
Rhodochiton
Rhodochiton atrosanguineus (purple bell vine)
Rhododendron (rhododendrons and azaleas)
Rhododendron 'Anah Kruschke' (Anah Kruschke Rhododendron)
Rhododendron 'Azurro' (Azurro Rhododendron)
Rhododendron 'Bow Bells' (Bow Bells Rhododendron)
Rhododendron calendulaceum (Flame Azalea)
Rhododendron canescens (Mountain Azalea)
Rhododendron cf. catawbiense (lavender hybrid) (Lavender Rhododendron)
Rhododendron cf. catawbiense (red hybrid) (Red Rhododendron)
Rhododendron 'Christmas Cheer' (Christmas Cheer Rhododendron)
Rhododendron 'Cilpinense' (Cilpinense Rhododendron)
Rhododendron 'Conversation Piece' (Conversation Piece Azalea)
Rhododendron 'Fantastica' (Fantastica Rhododendron)
Rhododendron 'Fred Peste' (Fred Peste Rhododendron)
Rhododendron 'Girard''s Crimson' (Girard's Crimson Azalea)
Rhododendron 'Girard''s Fuchsia' (Girard's Fuchsia Azalea)
Rhododendron 'Glacier' (Glacier Rhododendron)
Rhododendron groenlandicum (Labrador Tea)
Rhododendron 'Hachmann''s Charmant' (Hachmann's Charmant)
Rhododendron 'Hardy Gardenia' (Hardy Gardenia Azalea)
Rhododendron 'Herbert' (Herbert Rhododendron)
Rhododendron 'Hino-Crimson' (Hino-Crimson Azalea)
Rhododendron 'Hinode-giri' (Hinode-giri Azalea)
Rhododendron × hybridum (garden rhododendron)
Rhododendron impeditum (Dwarf Purple Rhododendron)
Rhododendron indicum (southern Indian azalea)
Rhododendron japonicum (Japanese azalea)
Rhododendron 'Ken Janeck' (Ken Janeck Rhododendron)
Rhododendron lepidotum (scaly rhododendron)
Rhododendron luteum (Yellow Azalea)
Rhododendron macrophyllum (Pacific Rhododendron)
Rhododendron maximum (great rhododendron)
Rhododendron menziesii (mock azalea)
Rhododendron mucronulatum (Korean azalea)
Rhododendron 'Nancy Evans' (Nancy Evans Rhododendron)
Rhododendron 'Nova Zembla' (Nova Zembla Rhododendron)
Rhododendron occidentale (western azalea)
Rhododendron 'Odee Wright' (Odee Wright Rhododendron)
Rhododendron periclymenoides (Pinxter Flower)
Rhododendron ponticum (Common Rhododendron)
Rhododendron 'President Roosevelt' (President Roosevelt Rhododendron)
Rhododendron prinophyllum (early azalea)
Rhododendron quinquefolium (quinquefolium azalea)
Rhododendron 'Rosa Mundi' (Rosa Mundi Rhododendron)
Rhododendron 'Roseum Pink' (Roseum Pink Rhododendron)
Rhododendron schlippenbachii (royal azalea)
Rhododendron simsii (Indian Azalea)
Rhododendron 'Snowbird' (Snowbird Rhododendron)
Rhododendron stenopetalum 'Linearifolium' (spider azalea)
Rhododendron 'Unique' (Unique Rhododendron)
Rhododendron viscosum (swamp azalea)
Rhododendron 'Vulcan''s Flame' (Vulcan's Flame Rhododendron)
Rhododendron yakushimanum (yakushima rhododendron)
Rhodomyrtus
Rhodomyrtus psidioides (Native Guava)
Rhodosphaera
Rhodosphaera rhodanthema (deep yellow wood)
Rhodotypos
Rhodotypos scandens (jetbead)
Rhus (sumacs)
Rhus aromatica (fragrant sumac)
Rhus copallinum (shining sumac)
Rhus glabra (smooth sumac)
Rhus integrifolia (lemonade berry)
Rhus lanceolata (Prairie flameleaf sumac)
Rhus ovata (sugar bush)
Rhus × pulvinata (Northern Sumac)
Rhus trilobata (Skunkbush Sumac)
Rhus typhina (staghorn sumac)
Rhus typhina 'Dissecta' (cutleaf staghorn sumac)
Rhus virens (evergreen sumac)
Rhynchosia (Snoutbeans)
Rhynchospora (Beaksedges)
Rhynchospora colorata (White-Top Sedge)
Rhynchostegium
Rhynchostegium confertum (Clustered Feather-moss)
Rhytidiadelphus
Rhytidiadelphus loreus (Lanky Moss)
Rhytidiadelphus squarrosus (Square Gooseneck Moss)
Rhytidosporum
Rhytidosporum procumbens (white marianth)
Ribes (currants and gooseberries)
Ribes americanum (American Black Currant)
Ribes aureum (Golden Currant)
Ribes bracteosum (stink current)
Ribes cereum (wax currant)
Ribes cynosbati (prickly gooseberry)
Ribes divaricatum (Coast Black Gooseberry)
Ribes lacustre (swamp gooseberry)
Ribes malvaceum (Chaparral Currant)
Ribes missouriense (Missouri Gooseberry)
Ribes nevadense (mountain pink currant)
Ribes nigrum (Blackcurrant)
Ribes roezlii (Sierra Gooseberry)
Ribes rubrum (Red Currant)
Ribes sanguineum (red flowering currant)
Ribes sanguineum 'Pulborough Scarlet' (Pulborough Scarlet Currant)
Ribes speciosum (Fuchsiaflower Gooseberry)
Ribes uva-crispa (European gooseberry)
Riccia (Crystalworts)
Richardia (Mexican clovers)
Richardia grandiflora (largeflower Mexican clover)
Richea
Richea pandanifolia (Pandani)
Richea scoparia (scoparia)
Ricinocarpos
Ricinocarpos pinifolius (Wedding Bush)
Ricinus
Ricinus communis (castor bean)
Rivina
Rivina humilis (pigeonberry)
Robinia (Locust Trees)
Robinia pseudoacacia (black locust)
Robinia pseudoacacia 'Frisia' (golden black locust)
Rodgersia (rodgersia)
Roepera (Twinleaves)
Romneya (Matilija poppies)
Romneya coulteri (Matilija poppy)
Romulea (Froetangs)
Romulea rosea (Rosy sandcrocus)
Rorippa (yellowcresses)
Rorippa palustris (Bog Yellowcress)
Rosa acicularis (Prickly Wild Rose)
Rosa 'Adélaide d''Orléans' (Adelaide d'Orleans Rose)
Rosa 'Alain Blanchard' (Alain Blanchard Rose)
Rosa 'Apricot Drift' (Apricot Drift Rose)
Rosa arkansana (prairie rose)
Rosa arvensis (Field Rose)
Rosa 'Autumn Sunset' (Autumn Sunset Rose)
Rosa banksiae (Lady Banks Rose)
Rosa banksiae 'Lutea'
Rosa 'Bienenweide Rosa'
Rosa 'Bolero' (Bolero Rose)
Rosa 'Buff Beauty' (Buff Beauty Rose)
Rosa californica (California Wild Rose)
Rosa canina (dog rose)
Rosa carolina (Carolina rose)
Rosa 'Chevy Chase'
Rosa 'Coral Drift' (Coral Drift Rose)
Rosa 'Don Juan' (Don Juan Rose)
Rosa 'Double Knock Out' (Double Knock Out Rose)
Rosa 'Felicia' (Felicia Rose)
Rosa 'Félicité et Perpétue' (Felicite et Perpetue)
Rosa (Floribunda Group) (floribunda roses)
Rosa 'Francis E. Lester' (Francis E. Lester Rose)
Rosa 'Geranium'
Rosa glauca (redleaf rose)
Rosa 'Golden Wings' (Golden Wings Rose)
Rosa gymnocarpa (bald-hip rose)
Rosa gymnocarpa (bald-hip rose)
Rosa 'Hansa' (Hansa Rose)
Rosa 'Intrigue' (Intrigue Rose)
Rosa 'Julia Child' (Julia Child Rose)
Rosa 'Lykkefund' (Lykkefund Rose)
Rosa 'Marchesa Boccella' (Marchesa Boccella Rose)
Rosa multiflora (multiflora rose)
Rosa nutkana (Nootka rose)
Rosa odorata 'Mutabilis' (Mutabilis Rose)
Rosa palustris (swamp rose)
Rosa 'Peach Drift' (Peach Drift Rose)
Rosa 'Peggy Martin' (Peggy Martin Rose)
Rosa pisocarpa (clustered wild rose)
Rosa 'Rose de Rescht' (Rose de Rescht)
Rosa rubiginosa (Sweet-brier)
Rosa rugosa (rugosa rose)
Rosa 'Sally Holmes' (Sally Holmes Rose)
Rosa 'Sander''s White Rambler' (Sanders' White Rambler)
Rosa 'Seagull' (Seagull Rose)
Rosa setigera (climbing prairie rose)
Rosa 'Special Anniversary'
Rosa spinosissima (Burnet Rose)
Rosa spinosissima 'Dunwich Rose'
Rosa spinosissima 'Falkland'
Rosa 'Stanwell Perpetual' (Stanwell Perpetual Rose)
Rosa 'Sweet Drift' (Sweet Drift Rose)
Rosa 'The Generous Gardener' (The Generous Gardener Rose)
Rosa willmottiae
Rosa woodsii (Woods Rose)
Rosmarinus
Rosmarinus officinalis 'Tuscan Blue' (Tuscan Blue Rosemary)
Rosulabryum
Rosulabryum billardierei
Roystonea
Rubia
Rubia peregrina (Wild Madder)
Rubus (brambles)
Rubus allegheniensis (Allegheny blackberry)
Rubus armeniacus (Himalayan blackberry)
Rubus caesius (European dewberry)
Rubus calycinoides (Creeping Raspberry)
Rubus chamaemorus (cloudberry)
Rubus 'Chester' (Chester Thornless Blackberry)
Rubus cuneifolius (sand blackberry)
Rubus ellipticus (Golden Raspberry)
Rubus flagellaris (Common Dewberry)
Rubus fruticosus
Rubus hayata-koidzumii (creeping raspberry)
Rubus hispidus (swamp dewberry)
Rubus idaeus (raspberry)
Rubus laciniatus (evergreen blackberry)
Rubus leucodermis (Blackcap Raspberry)
Rubus moluccanus (Molucca Bramble)
Rubus occidentalis (black raspberry)
Rubus odoratus (purple-flowered raspberry)
Rubus parviflorus (thimbleberry)
Rubus parvifolius (small-leaf bramble)
Rubus pensilvanicus (Pennsylvania Blackberry)
Rubus phoenicolasius (wineberry)
Rubus pubescens (dwarf raspberry)
Rubus rolfei (Creeping Bramble)
Rubus rosifolius (roseleaf bramble)
Rubus spectabilis (salmonberry)
Rubus spectabilis 'Olympic Double' (Olympic Double Salmonberry)
Rubus tricolor (Chinese Bramble)
Rubus trivialis (southern dewberry)
Rubus tuberculatus (Ruderal Corylifolian)
Rubus ulmifolius (elmleaf blackberry)
Rubus ursinus (trailing blackberry)
Rubus vestitus (Vested Blackberry)
Rudbeckia (black-eyed Susans and coneflowers)
Rudbeckia × 'American Gold Rush' (American Gold Rush Black-Eyed Susan)
Rudbeckia amplexicaulis (clasping coneflower)
Rudbeckia fulgida (Black-eyed Susan)
Rudbeckia fulgida var. deamii (Deams Black-Eyed Susan)
Rudbeckia fulgida var. fulgida (Orange Coneflower)
Rudbeckia fulgida var. speciosa 'Viette's Little Suzy' (Little Suzy Black-Eyed Susan)
Rudbeckia fulgida var. sullivantii 'Goldsturm' (black-eyed Susan)
Rudbeckia hirta (large black-eyed Susan)
Rudbeckia hirta 'Indian Summer' (Indian Summer Black-Eyed Susan)
Rudbeckia hirta 'Prairie Sun' (Prairie Sun Rudbeckia)
Rudbeckia laciniata (cutleaf coneflower)
Rudbeckia occidentalis (Western Black-eyed Susan)
Rudbeckia subtomentosa (sweet black-eyed Susan)
Rudbeckia triloba (Brown-Eyed Susan)
Ruellia (Ruellias)
Ruellia caroliniensis (Carolina ruellia)
Ruellia humilis (hairy ruellia)
Ruellia nudiflora (violet ruellia)
Ruellia simplex (Mexican Petunia)
Ruellia strepens (smooth ruellia)
Rumex (docks and sorrels)
Rumex acetosa (Sorrel)
Rumex acetosella (sheep sorrel)
Rumex brownii (Slender Dock)
Rumex conglomeratus (Clustered Dock)
Rumex crispus (curly-leaved dock)
Rumex cristatus (Greek Dock)
Rumex hastatulus (Hastate-leaved dock)
Rumex hydrolapathum (Water Dock)
Rumex hymenosepalus (Canaigre Dock)
Rumex obtusifolius (broad-leaved dock)
Rumex sagittatus (Climbing dock)
Rumex salicifolius (willow dock)
Rumex sanguineus (Wood Dock)
Ruschia (Tentfigs)
Ruscus
Ruscus aculeatus (butcher's-broom)
Russelia
Ruta (rues)
Rytidosperma (Wallaby grasses)
Rytidosperma pallidum (red-anther wallaby grass)
Sabal (Palmettos)
Sabal minor (Dwarf Palmetto)
Sabal palmetto (cabbage palmetto)
Sabatia (rose gentians)
Sabatia angularis (Rosepink)
Sabatia campestris (Meadow Pink)
Sabatia stellaris (marsh pink)
Sagina (pearlworts)
Sagina procumbens (pearlwort)
Sagina subulata (Irish moss)
Sagina subulata 'Aurea' (Golden Irish Moss)
Sagittaria (Arrowheads)
Sagittaria lancifolia (lanceleaf arrowhead)
Sagittaria latifolia (Wapato)
Sagittaria sagittifolia (Arrowhead)
Saintpaulia
Saintpaulia ionantha (variegated) (Variegated African Violet)
Sairocarpus
Sairocarpus nuttallianus (Nuttall's Snapdragon)
Salicornia (pickleweeds)
Salicornia europaea (Common Glasswort)
Salicornia pacifica (Pacific Glasswort)
Salicornia quinqueflora (Beaded Samphire)
Salix (Willows)
Salix alba (white willow)
Salix alba 'Tristis' (Golden Weeping Willow)
Salix atrocinerea (Rusty Willow)
Salix aurita (Eared Willow)
Salix babylonica (weeping willow)
Salix babylonica 'Tortuosa' (corkscrew willow)
Salix caprea (goat willow)
Salix caroliniana (Carolina willow)
Salix cinerea (Grey Willow)
Salix discolor (White Pussy Willow)
Salix exigua (Narrowleaf Willow)
Salix × fragilis (hybrid crack willow)
Salix gooddingii (Goodding's willow)
Salix hookeriana (Coastal Willow)
Salix integra 'Hakuro Nishiki' (Variegated Willow)
Salix interior (interior sandbar willow)
Salix laevigata (red willow)
Salix lasiandra (Pacific willow)
Salix lasiolepis (Arroyo Willow)
Salix × matsudana × alba (Willow Hybrid Tree)
Salix nakamurana var. yezoalpina (Yezo Alpine Willow)
Salix nigra (black willow)
Salix purpurea (Purple Willow)
Salix purpurea 'Nana' (dwarf Alaskan purple willow)
Salix repens (Creeping Willow)
Salix scouleriana (Scouler’s willow)
Salix sitchensis (Sitka willow)
Salix viminalis (basket willow)
Salsola (Russian Thistles)
Salsola australis (Southern Russian Thistle)
Salsola tragus (Prickly Russian Thistle)
Salvia (Sages)
Salvia × 'Amistad' (Amistad Sage)
Salvia apiana (white sage)
Salvia azurea (giant blue sage)
Salvia canescens var. daghestanica (Daghestan Sage)
Salvia coccinea (Tropical sage)
Salvia columbariae (Chia)
Salvia confertiflora
Salvia dorrii (Dorr's Sage)
Salvia farinacea (mealy sage)
Salvia × floriferior (Russian Sage)
Salvia fulgens (cardinal sage)
Salvia greggii (Autumn sage)
Salvia × 'Indigo Spires' (Indigo Spires Sage)
Salvia leucantha (Mexican Bush Sage)
Salvia leucophylla (purple sage)
Salvia mellifera (black sage)
Salvia microphylla (Baby Sage)
Salvia microphylla 'Hot Lips' (baby sage, Hot Lips)
Salvia nemorosa (Woodland Sage)
Salvia nemorosa 'Blue Hill' (Blue Hill Meadow Sage)
Salvia nemorosa 'Caradonna' (Caradonna Meadow Sage)
Salvia nemorosa 'East Friesland' (East Friesland Meadow Sage)
Salvia nemorosa 'May Night' (May Night woodland sage)
Salvia nutans
Salvia rosmarinus (rosemary)
Salvia spathacea (Hummingbird Sage)
Salvia sylvestris 'Mainacht' (May Night Sage)
Salvia verbenaca (wild clary)
Salvia verticillata 'Purple Rain' (Purple Rain Sage)
Salvia x sylvestris 'Caradonna' (caradonna sage)
Salvia yangii (Russian Sage)
Sambucus (elders)
Sambucus canadensis (American black elderberry)
Sambucus cerulea (Blue Elderberry)
Sambucus gaudichaudiana (White Elderberry)
Sambucus nigra
Sambucus nigra 'Black Lace' (Black Lace Elderberry)
Sambucus nigra 'Eva' (Black Beauty Elderberry)
Sambucus nigra f. laciniata (Cut-leaved Elder)
Sambucus nigra 'Guincho Purple' (Guincho Purple Elder)
Sambucus racemosa (red elderberry)
Sambucus racemosa 'Plumosa Aurea' (Golden Elder)
Sambucus spp. (elderberry)
Samolus
Samolus parviflorus (seaside brookweed)
Samolus repens (Sea Primrose)
Sanchezia
Sanguisorba (burnets)
Sanguisorba minor (Salad Burnet)
Sanguisorbia hakusanensis 'Lilac Squirrel' (Pink squirrel tails)
Sanicula (sanicles)
Sanicula bipinnatifida (Purple Sanicle)
Sanicula canadensis (Black Snakeroot)
Sanicula crassicaulis (Pacific Sanicle)
Sanicula europaea (wood sanicle)
Sanicula odorata (Clustered Sanicle)
Sansevieria (Mother-in-law's Tongues)
Sansevieria trifasciata (Snake Plant)
Santalum
Santalum acuminatum (Desert Quandong)
Santalum lanceolatum (Blue Bush)
Santolina (Lavender-cottons)
Santolina chamaecyparissus (cotton vavender)
Santolina rosmarinifolia (Green Lavender Cotton)
Sapindus
Sapindus drummondii (Western Soapberry)
Saponaria
Saponaria officinalis (common soapwort)
Sarcobatus
Sarcobatus vermiculatus (Greasewood)
Sarcococca
Sarcococca confusa (tall sarcococca)
Sarcococca hookeriana var. humilis (low sarcococca)
Sarcodes
Sarcodes sanguinea (Snowplant)
Sarcopetalum
Sarcopetalum harveyanum (pearl vine)
Sarracenia (North American pitcher plants)
Sarracenia flava (yellow pitcher plant)
Sarracenia leucophylla (white pitcher plant)
Sarracenia × mitchelliana (Mitchell's Pitcher Plant)
Sarracenia × moorei (Moore's Pitcher Plant)
Sarracenia × naczii (Naczi's Pitcher Plant)
Sarracenia purpurea (purple pitcher plant)
Saruma
Saruma henryi (upright wild ginger)
Satureja
Satureja hortensis (Summer Savory)
Satureja montana (Winter Savory)
Saururus
Saururus cernuus (Lizard's Tail)
Saxifraga (Saxifrages)
Saxifraga aizoides (Yellow Saxifrage)
Saxifraga granulata (Meadow Saxifrage)
Saxifraga stolonifera (strawberry begonia)
Saxifraga tridactylites (Rue-leaved Saxifrage)
Saxifraga umbrosa
Saxifraga x urbium (London pride)
Scabiosa (Pincushion flowers)
Scabiosa 'Butterfly Blue' (dwarf blue pincushion flower)
Scabiosa canescens (Gray Pincushion Flower)
Scabiosa 'Pink Mist' (Pink Mist Scabious)
Scaevola (fanflowers)
Scaevola aemula (Fairy Fan-flower)
Scaevola albida (white fanflower)
Scaevola calendulacea (dune fan-flower)
Scaevola crassifolia (Cushion Fanflower)
Scaevola ramosissima (Hairy Fan-flower)
Scaevola taccada (beach naupaka)
Scandosorbus
Scandosorbus intermedia (Swedish Whitebeam)
Scapania
Sceptridium (grapeferns)
Sceptridium dissectum (Cutleaf Grapefern)
Schefflera
Schefflera arboricola (Dwarf Umbrella Tree)
Schelhammera
Schelhammera undulata (lilac lily)
Schinus (peppertrees)
Schinus areira (Peppercorn Tree)
Schinus molle (Peruvian Pepper Tree)
Schinus terebinthifolia (Brazilian pepper)
Schisandra
Schisandra chinensis (Five-flavor Berry)
Schistidium
Schistidium crassipilum (Thickpoint Bloom Moss)
Schizachyrium
Schizachyrium scoparium (Little Bluestem)
Schizaea
Schizaea bifida (Forked Comb Fern)
Schizophragma
Schizophragma hydrangeoides (Japanese Climbing Hydrangea)
Schlumbergera (Christmas cacti)
Schlumbergera × buckleyi (Christmas Cactus)
Schoenoplectus (Schoenoplectus Bulrushes)
Schoenoplectus acutus (hardstem bulrush)
Schoenoplectus californicus (California bulrush)
Schoenoplectus tabernaemontani (Soft-stem Bullrush)
Schoenus
Schoenus apogon (common bog-rush)
Sciadopitys
Sciadopitys verticillata (Japanese umbrella pine)
Scilla (Squills)
Scilla forbesii (Forbes' Glory-of-the-snow)
Scilla verna (Spring Squill)
Scindapsus
Scindapsus pictus (Satin Pothos)
Scirpus (Scirpus Bulrushes)
Scirpus atrovirens (dark green bulrush)
Scirpus cyperinus (Woolgrass)
Scirpus microcarpus (small-fruited bulrush)
Scleranthus
Scleranthus biflorus
Scleria (nutrushes)
Scoliopus
Scoliopus bigelovii (California fetid adderstongue)
Scorzoneroides
Scorzoneroides autumnalis (Autumn Hawkbit)
Scrophularia (figworts)
Scrophularia californica (California beeplant)
Scrophularia marilandica (late figwort)
Scrophularia nodosa (Common Figwort)
Scutellaria (skullcaps)
Scutellaria drummondii (Drummond's skullcap)
Scutellaria elliptica (Hairy Skullcap)
Scutellaria galericulata (Marsh Skullcap)
Scutellaria integrifolia (Helmet skullcap)
Scutellaria lateriflora (side-flowering skullcap)
Scutellaria mexicana (Paperbag Bush)
Scutellaria nana
Scutellaria ovata (Heart-leaved Skullcap)
Scutellaria suffrutescens (Pink Skullcap)
Searsia (Karees)
Securigera
Securigera varia (purple crownvetch)
Sedum acre (Biting Stonecrop)
Sedum anglicum (English Stonecrop)
Sedum × 'Autumn Fire' (Autumn Fire Stonecrop)
Sedum 'Bertram Anderson' (Bertram Anderson Stonecrop)
Sedum divergens (Spreading Stonecrop)
Sedum ewersii (Pink Stonecrop)
Sedum kimnachii (Kimnach's Stonecrop)
Sedum lanceolatum (Spearleaf Stonecrop)
Sedum oreganum (Oregon Stonecrop)
Sedum 'Purple Emperor' (Purple Emperor Stonecrop)
Sedum × rubrotinctum (Christmas-cheer)
Sedum sarmentosum (Stringy Stonecrop)
Sedum sexangulare
Sedum sieboldii (October Daphne)
Sedum spathifolium 'Cape Blanco' (Cape Blanco sedum)
Sedum spathulifolium (Broadleaf Stonecrop)
Sedum spectabile (sedum)
Sedum spectabile 'Autumn Joy' (Autumn Joy Stonecrop)
Sedum stenopetalum (Wormleaf Stonecrop)
Sedum ternatum (woodland stonecrop)
Sedum × 'Vera Jameson' (Vera Jameson Stonecrop)
Selaginella (Spikemosses)
Selaginella bigelovii (Bigelow's Spikemoss)
Selaginella uliginosa (Swamp Spikemoss)
Selago (Bitterbushes)
Selenicereus (moonlight cactuses)
Selenicereus undatus (Dragon Fruit)
Sematophyllum
Sematophyllum homomallum (Bronze Moss)
Sempervivum arachnoideum (cobweb houseleek)
Sempervivum calcareum
Sempervivum species & cvs (Houseleek)
Sempervivum tectorum (Hens and Chicks)
Senecio (groundsels)
Senecio ampullaceus (Texas ragwort)
Senecio elegans (Red-purple Ragwort)
Senecio flaccidus (threadleaf groundsel)
Senecio glomeratus (Cutleaf burnweed)
Senecio hispidulus (Hill Fireweed)
Senecio inaequidens (Narrow-leaved Ragwort)
Senecio integerrimus (Tall western groundsel)
Senecio linearifolius (fireweed groundsel)
Senecio madagascariensis (Madagascar Ragwort)
Senecio minimus (coastal burnweed)
Senecio odoratus (Scented Groundsel)
Senecio pinnatifolius (pinnate-leaved groundsel)
Senecio pterophorus (Shoddy Ragwort)
Senecio quadridentatus (cotton burnweed)
Senecio squalidus (Oxford Ragwort)
Senecio sylvaticus (wood groundsel)
Senecio triangularis (Arrowleaf Senecio)
Senecio viscosus (Sticky Groundsel)
Senecio vulgaris (common groundsel)
Senega
Senega alba (white milkwort)
Senegalia (Hook-Thorns)
Senegalia greggii (Catclaw Acacia)
Senega lutea (orange milkwort)
Senega nana (candyroot)
Senega paniculata (rootbeer plant)
Senega sanguinea (field milkwort)
Senna (sennas)
Senna artemisioides (silver senna)
Senna bicapsularis (Butterfly Bush Senna)
Senna covesii (Coues' senna)
Senna hebecarpa (American senna)
Senna lindheimeriana (Lindheimer's Senna)
Senna marilandica (Maryland senna)
Senna obtusifolia (American Sicklepod)
Senna pendula (Christmas Senna)
Senna roemeriana (Two-leaved Senna)
Senna septemtrionalis (Arsenic Bush)
Sequoia (Redwood)
Sequoiadendron
Sequoiadendron giganteum (giant sequoia)
Sequoiadendron giganteum 'Pendulum' (weeping Giant Sequoia)
Sequoia sempervirens (Coast Redwood)
Serapias (Tongue Orchids)
Serenoa
Serenoa repens (saw palmetto)
Sesbania (riverhemps)
Sesbania drummondii (Rattlebush)
Sesbania grandiflora (Hummingbird Tree)
Sesbania herbacea (bigpod sesbania)
Sesbania vesicaria (Bladder Pod)
Seseli
Seseli libanotis
Sesleria
Sesleria autumnalis (Autumn Moor Grass)
Sesleria heufleriana
Sesleria nitida
Sesleria spp. (moor grass)
Sesuvium (Sea-purslanes)
Sesuvium portulacastrum (sea purslane)
Setaria (foxtails and bristlegrasses)
Setaria faberi (giant foxtail)
Setaria parviflora (knotroot bristlegrass)
Setaria pumila (yellow foxtail)
Setaria viridis (Green Bristle Grass)
Shepherdia
Shepherdia argentea (Silver Buffaloberry)
Shepherdia canadensis (Russet Buffaloberry)
Sherardia
Sherardia arvensis (Field madder)
Shibataea
Shibataea kumasasa (Ruscus-leaved Bamboo)
Sibbaldiopsis
Sibbaldiopsis tridentata (three-toothed cinquefoil)
Sicyos
Sicyos angulatus (Oneseed Bur Cucumber)
Sida (Sidas)
Sida abutilifolia (spreading sida)
Sida cordifolia (flannel weed)
Sidalcea (Checkerblooms)
Sidalcea campestris (Meadow Checker-mallow)
Sidalcea hendersonii (Henderson's Checker-mallow)
Sidalcea malviflora (Rose Checker-mallow)
Sidalcea oregana (Oregon Checker-Mallow)
Sidalcea sparsifolia (Southern Checkerbloom)
Sidalcea virgata (Virgate Checker-mallow)
Sida rhombifolia (Cuban jute)
Sida ulmifolia (Common Fanpetals)
Sideroxylon
Sideroxylon lanuginosum (Gum bumelia)
Sigesbeckia
Sigesbeckia orientalis (Eastern St Paul's-wort)
Silene (Catchflies)
Silene acaulis (Moss Campion)
Silene coronaria (Rose campion)
Silene dioica (red campion)
Silene flos-cuculi (ragged-robin)
Silene gallica (Small-flowered Catchfly)
Silene × hampeana (Hybrid Campion)
Silene inflata (bladder campion)
Silene laciniata (cardinal catchfly)
Silene latifolia (white campion)
Silene nocturna (night-flowering catchfly)
Silene stellata (starry campion)
Silene uniflora (Sea Campion)
Silene virginica (fire pink)
Silene vulgaris (bladder campion)
Silphium (Rosinweeds)
Silphium integrifolium (prairie rosinweed)
Silphium laciniatum (compass plant)
Silphium perfoliatum (cup plant)
Silphium terebinthinaceum (prairie dock)
Silybum
Silybum marianum (milk thistle)
Simmondsia
Simmondsia chinensis (jojoba)
Sinapis
Sinapis alba (White Mustard)
Sison
Sison amomum (stone parsley)
Sisymbrium (Hedgemustards)
Sisymbrium altissimum (Tall Tumblemustard)
Sisymbrium irio (London rocket)
Sisymbrium loeselii (False London-rocket)
Sisymbrium officinale (Hedge mustard)
Sisymbrium orientale (eastern rocket)
Sisyrinchium (blue-eyed grasses)
Sisyrinchium angustifolium (Blue-Eyed Grass)
Sisyrinchium bellum (western blue-eyed grass)
Sisyrinchium californicum (Golden Blue-eyed Grass)
Sisyrinchium idahoense (Idaho Blue-eyed Grass)
Sisyrinchium micranthum (Blue Pigroot)
Sisyrinchium pruinosum (Roadside Blue-eyed Grass)
Sisyrinchium striatum (pale yellow-eyed grass)
Sium
Sium suave (water parsnip)
Sixalix
Sixalix atropurpurea (Sweet scabious)
Skimmia
Skimmia japonica (Japanese skimmia)
Smallanthus
Smallanthus uvedalia (bear's foot)
Smilax (greenbriers)
Smilax auriculata (Earleaf Greenbrier)
Smilax australis (Austral Sarsaparilla)
Smilax bona-nox (saw greenbrier)
Smilax glauca (sawbrier)
Smilax glyciphylla (Sweet Sarsaparilla)
Smilax herbacea (smooth carrionflower)
Smilax rotundifolia (roundleaf greenbrier)
Smilax smallii (Lanceleaf Greenbrier)
Smilax tamnoides (bristly greenbrier)
Smyrnium
Smyrnium olusatrum (Alexanders)
Smyrnium perfoliatum (perfoliate alexanders)
Solanum (nightshades)
Solanum americanum (American black nightshade)
Solanum aviculare (New Zealand nightshade)
Solanum carolinense (Carolina horsenettle)
Solanum chrysotrichum (giant devil's-fig)
Solanum crispum 'Glasnevin' (Glasnevin Potato Vine)
Solanum dimidiatum (western horsenettle)
Solanum douglasii (greenspot nightshade)
Solanum dulcamara (bittersweet nightshade)
Solanum elaeagnifolium (silverleaf nightshade)
Solanum emulans (eastern black nightshade)
Solanum laciniatum (kangaroo-apple)
Solanum lycopersicum 'Big Boy' (Big Boy Tomato)
Solanum lycopersicum 'Black Cherry' (Black Cherry Tomato)
Solanum lycopersicum 'Black Krim' (Black Krim Tomato)
Solanum lycopersicum 'Brandywine' (Brandywine Tomato)
Solanum lycopersicum 'Bush Early Girl' (Bush Early Girl Tomato)
Solanum lycopersicum 'Celebrity' (Celebrity Tomato)
Solanum lycopersicum 'Cherokee Purple' (Cherokee Purple Tomato)
Solanum lycopersicum 'Early Girl' (Early Girl Tomato)
Solanum lycopersicum 'Glacier' (Glacier Tomato)
Solanum lycopersicum 'Heatmaster' (Heatmaster Tomato)
Solanum lycopersicum 'Iron Lady' (Iron Lady Tomato)
Solanum lycopersicum 'Patio' (Patio Tomato)
Solanum lycopersicum 'Patio Princess' (Patio Princess Tomato)
Solanum lycopersicum 'Phoenix' (Phoenix Tomato)
Solanum lycopersicum 'Red Cherry' (Red Cherry Tomato)
Solanum lycopersicum 'Roma' (Roma Tomato)
Solanum lycopersicum 'San Marzano' (San Marzano Tomato)
Solanum lycopersicum 'Stupice' (Stupice Tomato)
Solanum lycopersicum 'Sungold' (Sungold Cherry Tomato)
Solanum lycopersicum 'Sungold' (Sungold Cherry Tomato)
Solanum lycopersicum 'Surefire Red' (Surefire Red Tomato)
Solanum lycopersicum 'Yellow Pear' (Yellow Pear Tomato)
Solanum mauritianum (bugweed)
Solanum melongena 'Black Beauty' (Black Beauty Eggplant)
Solanum melongena 'Ichiban' (Ichiban Eggplant)
Solanum melongena 'Rosa Bianca' (Rosa Bianca Eggplant)
Solanum nigrum (black nightshade)
Solanum parishii (Parish's nightshade)
Solanum physalifolium (hairy nightshade)
Solanum prinophyllum (Forest Nightshade)
Solanum pseudocapsicum (Jerusalem cherry)
Solanum rostratum (buffalobur)
Solanum seaforthianum (Brazilian Nightshade)
Solanum sisymbriifolium (Red Buffalo-bur)
Solanum stelligerum (devil's needles)
Solanum tuberosum (potato)
Solanum umbelliferum (bluewitch nightshade)
Solanum xanti (purple nightshade)
Soldanella
Soldanella villosa (Hairy Snowbell)
Soleirolia
Soleirolia soleirolii (Baby's tears)
Solidago (goldenrods)
Solidago altissima (tall goldenrod)
Solidago bicolor (silverrod)
Solidago caesia (bluestem goldenrod)
Solidago canadensis (Canada goldenrod)
Solidago flexicaulis (broad-leaved goldenrod)
Solidago gigantea (giant goldenrod)
Solidago juncea (early goldenrod)
Solidago lepida (Canada goldenrod)
Solidago 'Loysder Crown' (Loysder Crown Solidago)
Solidago mexicana (Southern Seaside Goldenrod)
Solidago nemoralis (field goldenrod)
Solidago odora (Sweet Goldenrod)
Solidago rigida (stiff-leaved goldenrod)
Solidago rugosa (Wrinkle-Leaved Goldenrod)
Solidago rugosa 'Fireworks' (Fireworks Goldenrod)
Solidago sempervirens (northern seaside goldenrod)
Solidago ulmifolia (elm-leaved goldenrod)
Solidago velutina (velvety goldenrod)
Solidago virgaurea (European goldenrod)
Soliva
Soliva sessilis (common soliva)
Sonchus (sow thistles)
Sonchus arvensis (marsh sow thistle)
Sonchus asper (prickly sow thistle)
Sonchus fruticosus
Sonchus oleraceus (annual sow thistle)
Sophora (Necklacepods)
Sophora japonica (Japanese Pagoda Tree)
Sorbaria
Sorbaria sorbifolia 'Sem'
Sorbus (Rowans and Mountain Ashes)
Sorbus alnifolia (Korean Mountain Ash)
Sorbus americana (American mountain ash)
Sorbus aucuparia (European mountain ash)
Sorbus sitchensis (Sitka Mountain Ash)
Sorghastrum
Sorghastrum nutans (Indiangrass)
Sorghum (Johnsongrasses, milos, sudangrasses, and allies)
Sorghum bicolor (Sorghums)
Sorghum halepense (Johnson grass)
Sowerbaea
Sowerbaea juncea (Rush Lily)
Sowerbaea laxiflora (Purple Tassels)
Sparganium (bur-reeds)
Sparganium erectum (Branched Bur-reed)
Spartina
Spartina alterniflora (saltwater cordgrass)
Spartina anglica (English cordgrass)
Spartina bakeri (Sand Cordgrass)
Spartium
Spartium junceum (Spanish Broom)
Spathiphyllum (peace lillies)
Spathiphyllum wallisii (Peace Lily)
Spathoglottis
Spergula
Spergula arvensis (Corn spurrey)
Spergularia (Sand-Spurries)
Spergularia marina (Saltmarsh Sand Spurry)
Spergularia media (Greater Sea-spurry)
Spergularia rubra (Red Sand Spurrey)
Spergularia rupicola (Rock Sea-spurrey)
Spermacoce (False Buttonweeds)
Spermacoce verticillata (shrubby false buttonweed)
Sphaeralcea (globemallows)
Sphaeralcea ambigua (apricot globemallow)
Sphaeralcea coccinea (Scarlet Globemallow)
Sphaerolobium
Sphaerolobium minus (globe-pea)
Sphaeropteris
Sphaeropteris cooperi (Scaly Tree Fern)
Sphagneticola
Sphagneticola trilobata (Trailing Daisy)
Sphagnum (Sphagnum mosses)
Sphagnum capillifolium (Northern Peatmoss)
Sphagnum denticulatum (Cow-horn Bog-moss)
Sphagnum fallax (Flat-top Bogmoss)
Sphagnum palustre (Prairie Peatmoss)
Spigelia
Spigelia marilandica (Indian Pink)
Spinifex
Spinifex sericeus (Beach Spinifex)
Spinulum
Spinulum annotinum (interrupted clubmoss)
Spiraea (meadowsweets)
Spiraea alba (white meadowsweet)
Spiraea douglasii (western spirea)
Spiraea japonica (Japanese Spirea)
Spiraea japonica 'Goldflame' (Goldflame spirea)
Spiraea japonica 'Little Princess' (Little Princess spirea)
Spiraea lucida (Shinyleaf Spiraea)
Spiraea nipponica 'Snowmound' (snowmound spirea)
Spiraea splendens (Subalpine Spiraea)
Spiraea thunbergii (Thunberg spirea)
Spiraea tomentosa (Steeplebush)
Spiraea × vanhouttei (Vanhoutte spirea)
Spiranthes (Ladies'-tresses)
Spiranthes australis (austral ladies'-tresses)
Spiranthes spiralis (Autumn Ladies' Tresses)
Spiranthes × stellata (Starry Ladies'-Tresses)
Spiranthes vernalis (Spring Ladies' Tresses)
Sporobolus (dropseeds, cordgrasses, and sandreeds)
Sporobolus alterniflorus (Saltmarsh Cordgrass)
Sporobolus anglicus (common cordgrass)
Sporobolus heterolepis (Prairie Dropseed)
Sporobolus wrightii (Giant Sacaton)
Sprengelia
Sprengelia incarnata (Pink Swamp Heath)
Spyridium
Spyridium globulosum (basket bush)
Spyridium parvifolium (Australian dusty miller)
Stachys (Hedgenettles)
Stachys bullata (California Hedge Nettle)
Stachys byzantina (lamb's ears)
Stachys chamissonis (Coastal Hedge-nettle)
Stachys floridana (Florida Hedgenettle)
Stachys officinalis (wood betony)
Stachys palustris (Marsh Woundwort)
Stachys rigida (Rough Hedgenettle)
Stachys sylvatica (hedge woundwort)
Stachytarpheta (Porterweeds)
Stackhousia
Stackhousia monogyna (Creamy Candles)
Stackhousia viminea (Yellow Stackhousia)
Stanleya
Stanleya pinnata (Desert Prince's Plume)
Staphylea
Staphylea trifolia (American bladdernut)
Staurastrum
Stelis (Leach Orchids)
Stellaria (chickweeds)
Stellaria alsine (Bog Stitchwort)
Stellaria aquatica (Water Chickweed)
Stellaria flaccida (Forest Starwort)
Stellaria graminea (lesser stitchwort)
Stellaria media (chickweed)
Stellaria pubera (star chickweed)
Stellaria pungens (prickly starwort)
Stenanthera
Stenanthera conostephioides (Flame Heath)
Stenanthera pinifolia (pine heath)
Stenaria
Stenaria nigricans (diamond-flowers)
Stenocarpus
Stenocarpus sinuatus (Firewheel tree)
Stenocereus (Pitayas)
Stenotaphrum
Stenotaphrum secundatum (St. Augustine Grass)
Stephania
Stephania japonica (Tapevine)
Stephanomeria (Wirelettuces)
Stephanomeria diegensis (San Diego Wirelettuce)
Stephanomeria pauciflora (Brownplume Wirelettuce)
Stevia
Stevia rebaudiana (Stevia)
Stewartia
Stewartia monadelpha (tall stewartia)
Stewartia pseudocamellia (Japanese stewartia)
Sticherus
Sticherus flabellatus (Shiny fan fern)
Stillingia
Stillingia texana (Texas Stillingia)
Stipa (Needle Grasses)
Stipa gigantea (giant feather grass)
Stipa tenuissima
Strelitzia (Bird-of-paradise flowers)
Strelitzia nicolai (Giant Bird of Paradise)
Strelitzia reginae (Bird of Paradise)
Streptanthus
Streptanthus tortuosus (Mountain Jewelflower)
Streptocarpus (African Primrose)
Streptopus
Streptopus amplexifolius (white twisted-stalk)
Streptopus lanceolatus (rose twisted-stalk)
Strobilanthes (Coneflowers)
Strophostyles
Strophostyles helvola (trailing fuzzy-bean)
Struthiola (capesprays)
Struthiopteris
Struthiopteris spicant (deer fern)
Stylidium (Triggerplants)
Stylidium armeria (Thrift-leaved Triggerplant)
Stylidium graminifolium (Grass Triggerplant)
Stylosanthes
Stylosanthes biflora (sidebeak pencilflower)
Stypandra
Stypandra glauca (nodding blue lily)
Styphelia
Styphelia ericoides (Bearded Heath)
Styphelia humifusa (Cranberry Heath)
Styphelia sieberi (Prickly Beard-heath)
Styphnolobium
Styphnolobium affine (Eve's Necklacepod)
Styphnolobium japonicum (Japanese pagoda tree)
Styrax
Styrax japonicus (Japanese snowdrop tree)
Styrax obassia (fragrant snowbell)
Suaeda (Seepweeds)
Suaeda australis (Austral Seablite)
Suaeda maritima (Herbaceous Seepweed)
Suaeda vera (Shrubby Seablite)
Succisa
Succisa pratensis (Devil's-bit Scabious)
Sutera (Bacopa)
Swainsona
Swainsona formosa (Sturt's Desert Pea)
Swainsona galegifolia (Smooth Darling Pea)
Swainsona lessertiifolia (coast Swainson-pea)
Syagrus
Syagrus romanzoffiana (Queen Palm)
Symphoricarpos (snowberries)
Symphoricarpos albus (snowberry)
Symphoricarpos mollis (Creeping Snowberry)
Symphoricarpos occidentalis (Western Snowberry)
Symphoricarpos orbiculatus (coralberry)
Symphoricarpos rotundifolius (Roundleaf Snowberry)
Symphyotrichum (American asters)
Symphyotrichum chilense (Pacific Aster)
Symphyotrichum cordifolium (Common Blue Wood Aster)
Symphyotrichum divaricatum (southern annual saltmarsh aster)
Symphyotrichum drummondii (Drummond's aster)
Symphyotrichum ericoides (white heath aster)
Symphyotrichum laeve (smooth blue aster)
Symphyotrichum lanceolatum (panicled aster)
Symphyotrichum novae-angliae (New England aster)
Symphyotrichum novi-belgii (New York aster)
Symphyotrichum oblongifolium (Aromatic Aster)
Symphyotrichum patens (late purple aster)
Symphyotrichum pilosum (hairy white oldfield aster)
Symphyotrichum puniceum (swamp aster)
Symphyotrichum racemosum (Small White Aster)
Symphyotrichum shortii (Short's aster)
Symphyotrichum spathulatum (Western Mountain Aster)
Symphyotrichum subspicatum (Douglas' aster)
Symphytum grandiflorum (Creeping Comfrey)
Symphytum officinale (common comfrey)
Symphytum orientale (Soft Comfrey)
Symphytum tuberosum (Tuberous Comfrey)
Symplocarpus
Symplocarpus foetidus (Eastern Skunk Cabbage)
Symplocos
Symplocos tinctoria (Sweetleaf)
Syncarpia
Syncarpia glomulifera (Turpentine)
Syngonium (Arrow-head Vines)
Syngonium podophyllum (Arrowhead Plant)
Synoum
Synoum glandulosum (scentless rosewood)
Synsepalum
Synsepalum dulcificum (Miracle Fruit)
Syntrichia
Syntrichia montana (Intermediate Screw-moss)
Syntrichia ruraliformis (Sand-hill Screw-moss)
Syntrichia ruralis (Star Moss)
Syringa (Lilacs)
Syringa meyeri 'Palibin' (Dwarf Korean Lilac)
Syringa pubescens ssp. patula 'Miss Kim' (Miss Kim lilac)
Syringa reticulata (Japanese Tree Lilac)
Syringa vulgaris (lilac, common lilac)
Syzygium (Waterberries)
Syzygium australe (scrub cherry)
Syzygium floribundum (weeping lilli pilli)
Syzygium oleosum (Blue Lilly Pilly)
Syzygium smithii (Lilly Pilly)
Tabebuia (Trumpet trees)
Tabernaemontana
Tabernaemontana pandacaqui (Banana Bush)
Tacca
Tacca chantrieri (Black Bat Flower)
Tagetes (Marigolds)
Tagetes erecta (Mexican Marigold)
Tagetes minuta (wild marigold)
Tagetes patula (French marigold)
Tamala
Tamala palustris (swamp redbay)
Tamarix (Tamarisks)
Tamarix gallica (French tamarisk)
Tamarix ramosissima (saltcedar)
Tanacetum (tansies)
Tanacetum parthenium (feverfew)
Tanacetum vulgare (common tansy)
Taraxacum (dandelions)
Taraxacum erythrospermum (red-seeded dandelion)
Taraxacum officinale (Dandelion Greens)
Taraxia
Taraxia ovata (Sun Cup)
Tasmannia
Tasmannia insipida (Brush Pepperbush)
Tasmannia lanceolata (Mountain Pepper)
Taxodium (baldcypresses)
Taxodium ascendens (pondcypress)
Taxodium distichum (bald cypress)
Taxus (yews)
Taxus baccata (English yew)
Taxus baccata 'Fastigiata' (Irish Yew)
Taxus baccata 'Fastigiata Aurea' (Golden Irish Yew)
Taxus baccata 'Repandens' (Spreading English Yew)
Taxus brevifolia (Pacific yew)
Taxus canadensis (Canada yew)
Taxus cuspidata (Japanese yew)
Taxus cuspidata 'Nana' (Dwarf Japanese yew)
Taxus × media 'Hicksii' (Hicks yew)
Tecoma
Tecomaria
Tecomaria capensis (Cape Honeysuckle)
Tecoma x 'Orange Jubilee' (Orange Jubilee Tecoma)
Tectaria
Tellima
Tellima grandiflora (Fringecup)
Telmatoblechnum
Telmatoblechnum serrulatum (toothed midsorus fern)
Telopea
Telopea speciosissima (Waratah)
Telopea truncata (Tasmanian Waratah)
Templetonia
Templetonia retusa (Cockies Tongue)
Tephrosia (Hoarypeas)
Tephrosia virginiana (goat's rue)
Terminalia (Cluster-leafs)
Terminalia catappa (Sea Almond)
Tetragonia (Seacorals)
Tetragonia implexicoma (bower spinach)
Tetragonia tetragonoides (New Zealand Spinach)
Tetraneuris (Four-nerved Daisies)
Tetraneuris linearifolia (Fineleaf Four-nerved Daisy)
Tetraneuris scaposa (Stemmy Four-nerved Daisy)
Tetrarrhena
Tetrarrhena juncea (Forest Wire-grass)
Tetrastigma
Tetrastigma nitens (Native Grape)
Tetratheca
Tetratheca ciliata (Pink-bells)
Tetratheca pilosa (Hairy Pink-bells)
Tetratheca thymifolia (Thyme Pink-bells)
Teucrium (Woodsages)
Teucrium canadense (American germander)
Teucrium chamaedrys (Wall Germander)
Teucrium fruticans
Teucrium scorodonia (woodland germander)
Thalictrum (meadow-rues)
Thalictrum aquilegiifolium (Columbine Meadow Rue)
Thalictrum 'Black Stockings' (Black Stockings meadow rue)
Thalictrum dasycarpum (purple meadow-rue)
Thalictrum delavayi (Yunnan Meadow Rue)
Thalictrum dioicum (early meadow-rue)
Thalictrum fendleri (Torrey's Meadow-Rue)
Thalictrum flavum ssp. glaucum (Yellow Meadow Rue)
Thalictrum minus (Lesser Meadow-rue)
Thalictrum occidentale (Western Meadow-Rue)
Thalictrum polycarpum (Tall Meadow-rue)
Thalictrum pubescens (tall meadow-rue)
Thalictrum thalictroides (rue anemone)
Thamnobryum
Thamnobryum alopecurum (Fox-tail Feather-moss)
Thamnochortus (Thatching Reeds)
Thaumatophyllum
Thaumatophyllum bipinnatifidum (Split-Leaf Philodendron)
Thelesperma
Thelesperma filifolium (stiff greenthread)
Thelionema
Thelionema caespitosum (Tufted Blue Lily)
Thelymitra (Sun Orchids)
Thelymitra antennifera (lemon-scented sun orchid)
Thelymitra crinita (Blue Lady Orchid)
Thelymitra ixioides (spotted sun-orchid)
Thelymitra megacalyptra (plains sun orchid)
Thelymitra peniculata (trim sun orchid)
Thelymitra rubra (salmon sun-orchid)
Thelypteris
Thelypteris palustris (marsh fern)
Themeda
Themeda triandra (Kangaroo Grass)
Thermopsis (Goldenbanners)
Thermopsis montana (Mountain goldenbean)
Thesium (Rootthugs)
Thlaspi
Thlaspi arvense (field penny-cress)
Thomasia
Thomasia petalocalyx (paper flower)
Threlkeldia
Threlkeldia diffusa (Coast Bonefruit)
Thuidiopsis
Thuidiopsis sparsa (Sparse Fern Moss)
Thuidium (fern mosses)
Thuidium delicatulum (delicate fern moss)
Thuidium tamariscinum (Common Tamarisk-moss)
Thuja (arborvitaes)
Thuja koraiensis (Blue Korean Arborvitae)
Thuja occidentalis 'Degroot's Spire' (Degroot's Spire Thuja)
Thuja occidentalis 'Hetz Midget' (Hetz Midget Arborvitae)
Thuja occidentalis 'Smaragd' (Emerald Green Arborvitae)
Thuja plicata (western red cedar)
Thuja plicata 'Zebrina' (golden western red cedar)
Thuja × soeegaardii ('Green Giant' arborvitae)
Thujopsis
Thujopsis dolabrata (Japanese false arborvitae)
Thujopsis dolabrata 'Variegata' (variegated Japanese false arborvitae)
Thunbergia (Clockvines)
Thunbergia alata (black-eyed Susan vine)
Thunbergia grandiflora (Sky Vine)
Thymophylla (Pricklyleaves)
Thymophylla pentachaeta (Parralena)
Thymus (Thymes)
Thymus × citriodorus (Lemon Thyme)
Thymus praecox (Mother of Thyme)
Thymus praecox 'Coccineus' (Red Creeping Thyme)
Thymus pseudolanuginosus (Woolly Thyme)
Thymus serpyllum (Wild Thyme)
Thymus serpyllum 'Albus' (White Creeping Thyme)
Thymus serpyllum 'Elfin' (Elfin Creeping Thyme)
Thysanocarpus
Thysanocarpus curvipes (sand fringepod)
Thysanotus
Thysanotus patersonii (Twining Fringe-lily)
Thysanotus tuberosus (Common Fringe-lily)
Tiarella (foamflowers)
Tiarella cordifolia (Foamflower)
Tiarella cordifolia 'Brandywine' (Brandywine Foamflower)
Tiarella cordifolia 'Oakleaf' (Oakleaf Foamflower)
Tiarella cordifolia 'Running Tapestry' (Running Tapestry Foamflower)
Tiarella stolonifera (Creeping Foamflower)
Tiarella trifoliata (foamflower)
Tibouchina (glory bushes and allies)
Tibouchina urvilleana (Tibouchina Princess Flower)
Tigridia
Tigridia pavonia (Mexican shell flower)
Tilia (lindens, basswoods, and lime trees)
Tilia americana (basswood)
Tilia cordata (little‑leaf linden)
Tilia platyphyllos (Bigleaf Linden)
Tillandsia (Air Plant)
Tillandsia fasciculata (cardinal airplant)
Tillandsia × floridana (Florida airplant)
Tillandsia recurvata (ballmoss)
Tillandsia usneoides (Spanish moss)
Tillandsia utriculata (giant airplant)
Tinantia
Tinantia anomala (False dayflower)
Tipularia
Tipularia discolor (crane-fly orchid)
Tithonia (Mexican Sunflowers)
Todea
Todea barbara (king fern)
Tolmiea
Tolmiea menziesii (piggy-back plant)
Toona
Toona ciliata (Australian Red Cedar)
Torenia (wishbone flowers)
Torilis (hedge parslies)
Torilis arvensis (common hedge parsley)
Torilis japonica (upright hedge-parsley)
Torminalis
Torminalis glaberrima (Wild Service-tree)
Tortula
Tortula muralis (Wall Screw-moss)
Toxicodendron (poison ivies and oaks)
Toxicodendron diversilobum (Pacific poison oak)
Toxicodendron radicans (Poison Ivy)
Toxicodendron rydbergii (western poison ivy)
Toxicodendron vernix (poison sumac)
Toxicoscordion (Deathcamas)
Toxicoscordion fremontii (Fremont's Death Camas)
Toxicoscordion paniculatum (foothill deathcamas)
Toxicoscordion venenosum (Meadow Deathcamas)
Trachelospermum
Trachelospermum asiaticum (Asiatic Jasmine)
Trachelospermum jasminoides (star jasmine)
Trachyandra (Capespinachs)
Trachycarpus
Trachycarpus fortunei (windmill palm)
Trachymene
Trachymene incisa (Australian parsnip)
Trachystemon
Trachystemon orientalis (giant borage)
Tradescantia (Spiderworts)
Tradescantia fluminensis (small-leaf spiderwort)
Tradescantia occidentalis (Western Spiderwort)
Tradescantia ohiensis (Ohio spiderwort)
Tradescantia pallida (Purple Heart)
Tradescantia spathacea (Moses-in-the-Cradle)
Tradescantia subaspera (Zigzag Spiderwort)
Tradescantia virginiana (Virginia spiderwort)
Tradescantia zebrina (Inch Plant)
Tragia (noseburns)
Tragopogon (Salsifies)
Tragopogon dubius (Yellow Salsify)
Tragopogon porrifolius (purple salsify)
Tragopogon pratensis (meadow salsify)
Trema
Trema tomentosum (Nettle Tree)
Trentepohlia
Triadica
Triadica sebifera (Chinese Tallow)
Tribulus (Devil Thorns)
Tribulus terrestris (puncture vine)
Trichocereus
Trichodesma
Trichodesma zeylanicum (camel bush)
Trichomanes
Trichomanes venosum (veined bristle-fern)
Trichophorum
Trichophorum cespitosum (Tufted Bulrush)
Trichostema
Trichostema dichotomum (Blue Curls)
Trichostema lanatum (woolly bluecurls)
Trichostema lanceolatum (Vinegar Weed)
Tricoryne
Tricoryne elatior (yellow rush-lily)
Tridax
Tridax procumbens (Tridax Daisy)
Tridens
Tridens flavus (purpletop tridens)
Trifolium (clovers)
Trifolium angustifolium (Narrow-leaved clover)
Trifolium arvense (rabbitfoot clover)
Trifolium campestre (hop trefoil)
Trifolium dubium (Lesser hop trefoil)
Trifolium fragiferum (Strawberry clover)
Trifolium hirtum (Rose Clover)
Trifolium hybridum (Alsike clover)
Trifolium incarnatum (crimson clover)
Trifolium medium (Zigzag Clover)
Trifolium pratense (red clover)
Trifolium repens (white clover)
Trifolium willdenovii (tomcat clover)
Triglochin
Triglochin maritima (common arrowgrass)
Trillium (trilliums)
Trillium catesbaei (bashful wakerobin)
Trillium cernuum (nodding trillium)
Trillium chloropetalum (giant trillium)
Trillium cuneatum (Little Sweet Betsy)
Trillium decipiens
Trillium erectum (red trillium)
Trillium flexipes (drooping trillium)
Trillium grandiflorum (large white trillium)
Trillium kurabayashii (giant purple wakerobin)
Trillium luteum (Yellow Trillium)
Trillium ovatum (western trillium)
Trillium pusillum (Dwarf Trillium)
Trillium recurvatum (Prairie Trillium)
Trillium sessile (toadshade)
Trillium undulatum (painted trillium)
Trimezia (Walking Irises)
Triodanis (Venus' Looking-Glasses)
Triodanis biflora (Venus's looking-glass)
Triodanis perfoliata (clasping Venus's looking glass)
Tripladenia
Tripladenia cunninghamii (kreysigia)
Tripleurospermum
Tripleurospermum inodorum (scentless mayweed)
Tripleurospermum maritimum (Sea Mayweed)
Tripolium
Tripolium pannonicum (Sea Aster)
Tripsacum
Tripsacum dactyloides (eastern gamagrass)
Triquetrella
Triquetrella papillata
Tristaniopsis
Tristaniopsis laurina (Water Gum)
Triteleia
Triteleia grandiflora (large-flowered triteleia)
Triteleia hyacinthina (White Brodiaea)
Triteleia ixioides (Prettyface)
Triteleia laxa (Ithuriel's Spear)
Triticum
Triticum aestivum (Bread Wheat)
Triumfetta (Burweeds)
Trixis
Trixis californica (American threefold)
Trochocarpa
Trochocarpa laurina (Tree Heath)
Trochodendron
Trochodendron aralioides
Tropaeolum (Nasturtiums)
Tropaeolum majus (garden nasturtium)
Tsuga (hemlocks)
Tsuga canadensis (eastern hemlock)
Tsuga canadensis 'Pendula' (Weeping Canadian Hemlock)
Tsuga heterophylla (western hemlock)
Tsuga mertensiana (mountain hemlock)
Tulbaghia (Wild Garlics)
Tulbaghia violacea (society garlic)
Tulipa (tulips)
Tulipa gesneriana (Garden Tulip)
Tulipa 'Groenland'
Tulipa 'Little Beauty'
Tulipa praestans (excellent tulip)
Tulipa 'Purple Prince'
Tulipa 'Strong Gold'
Turnera
Turritis
Turritis glabra (Tower Mustard)
Tussilago
Tussilago farfara (colt's-foot)
Typha (Cattails)
Typha angustifolia (slender-leaved cattail)
Typha domingensis (southern cattail)
Typha × glauca (hybrid cattail)
Typha latifolia (common cat-tail)
Typha orientalis (Oriental Cattail)
Ulex (Gorses)
Ulex gallii (Western Gorse)
Ulex minor (Dwarf Gorse)
Ulmus (elms)
Ulmus alata (Winged Elm)
Ulmus americana (American Elm)
Ulmus americana 'Princeton' (Princeton American Elm Tree)
Ulmus crassifolia (Cedar Elm)
Ulmus × elegantissima 'Jacqueline Hillier' (Jacqueline Hillier Elm Tree)
Ulmus 'Frontier' (Frontier Elm Tree)
Ulmus glabra 'Camperdownii' (Camperdown elm)
Ulmus minor (Field Elm)
Ulmus parvifolia (Lacebark Chinese Elm Tree)
Ulmus procera (English elm)
Ulmus pumila (Siberian elm)
Ulmus rubra (slippery elm)
Ulota
Ulota crispa (crisped pincushion)
Ulva (Sea Lettuces)
Ulva intestinalis (Gutweed)
Ulva lactuca (Broadleaf Sea Lettuce)
Umbellularia
Umbellularia californica (California bay)
Umbilicus (Navelworts)
Umbilicus rupestris (Wall Pennywort)
Ungnadia
Ungnadia speciosa (Mexican buckeye)
Uniola
Uniola paniculata (sea oats)
Urena
Urena lobata (Caesar weed)
Urera
Uropappus
Uropappus lindleyi (silverpuffs)
Ursinia (Paraseeds)
Urtica (nettles)
Urtica dioica (stinging nettle)
Urtica gracilis (slender stinging nettle)
Urtica incisa (Scrub Nettle)
Urtica urens (small nettle)
Utricularia (Bladderworts)
Utricularia dichotoma (fairy aprons)
Utricularia × neglecta (Yellow bladderwort)
Uvularia
Uvularia grandiflora (largeflower bellwort)
Uvularia perfoliata (Perfoliate Bellwort)
Uvularia sessilifolia (sessile bellwort)
Vaccinium (blueberries, cranberries, and allies)
Vaccinium angustifolium (lowbush blueberry)
Vaccinium arboreum (sparkleberry)
Vaccinium corymbosum (blueberry)
Vaccinium elliottii (mayberry)
Vaccinium fuscatum (Black Highbush Blueberry)
Vaccinium macrocarpon (American Cranberry)
Vaccinium membranaceum (Black Huckleberry)
Vaccinium myrsinites (Shiny blueberry)
Vaccinium myrtillus (common bilberry)
Vaccinium ovalifolium (Oval-leaf Huckleberry)
Vaccinium ovatum (evergreen huckleberry)
Vaccinium oxycoccos (bog cranberry)
Vaccinium pallidum (Early Lowbush Blueberry)
Vaccinium parvifolium (red huckleberry)
Vaccinium stamineum (deerberry)
Vaccinium uliginosum (bog bilberry)
Vaccinium vitis-idaea (Lingonberry)
Vachellia (thorn trees)
Vachellia farnesiana (Sweet acacia)
Valeriana (valerians)
Valeriana dioica (Marsh Valerian)
Valeriana officinalis (common valerian)
Valeriana sitchensis (Sitka valerian)
Valerianella (Cornsalads)
Valerianella locusta (common cornsalad)
Valerianella radiata (beaked cornsalad)
Vancouveria
Vancouveria hexandra (inside-out flower)
Vanilla
Vanilla planifolia (Vanilla Orchid)
Veratrum (false hellebores)
Veratrum californicum (Corn Lily)
Veratrum nigrum
Veratrum viride (green false hellebore)
Verbascum (mulleins)
Verbascum blattaria (moth mullein)
Verbascum bombyciferum (white felted mullein)
Verbascum chaixii 'Album'
Verbascum chaixii 'Wedding Candles' (Wedding Candles Mullein)
Verbascum nigrum (Dark Mullein)
Verbascum olympicum (Olympic mullein)
Verbascum phoeniceum (purple verbascum)
Verbascum × 'Plum Smokey' (Plum Smokey Mullein)
Verbascum roripifolium (Watercress-Leaved Mullein)
Verbascum 'Southern Charm' (Southern Charm verbascum)
Verbascum thapsus (common mullein)
Verbascum virgatum (Wand Mullein)
Verbena (vervains)
Verbena bonariensis (tall verbena, Brazilian verbena)
Verbena bracteata (Bigbract Verbena)
Verbena brasiliensis (Brazilian Vervain)
Verbena canadensis 'Homestead Purple' (Verbena Purple Homestead)
Verbena canescens (Woolly Vervain)
Verbena halei (Texas vervain)
Verbena hastata (Blue Vervain)
Verbena lasiostachys (western vervain)
Verbena officinalis (Common vervain)
Verbena rigida (Rigid Verbena)
Verbena stricta (hoary vervain)
Verbena urticifolia (white vervain)
Verbesina (crownbeards)
Verbesina alternifolia (Wingstem)
Verbesina encelioides (cowpen daisy)
Verbesina occidentalis (Yellow Crownbeard)
Verbesina virginica (frostweed)
Vernonia (ironweeds)
Vernonia baldwinii (Western Ironweed)
Vernonia gigantea (Tall Ironweed)
Vernonia missurica (Missouri Ironweed)
Vernonia noveboracensis (New York Ironweed)
Veronica (speedwells)
Veronica americana (American brooklime)
Veronica anagallis-aquatica (blue water-speedwell)
Veronica arvensis (corn speedwell)
Veronica beccabunga (Brooklime)
Veronica chamaedrys (Germander Speedwell)
Veronica filiformis (Slender speedwell)
Veronica × franciscana (Hedge Veronica)
Veronica gracilis (Slender Speedwell)
Veronica hederifolia (Ivy-leaved Speedwell)
Veronica montana (Wood Speedwell)
Veronica odora (boxleaf hebe)
Veronica officinalis (heath speedwell)
Veronica peduncularis 'Georgia Blue' (Georgia Blue Speedwell)
Veronica peregrina (Purslane Speedwell)
Veronica persica (bird's-eye speedwell)
Veronica plebeia (Australian Speedwell)
Veronica polita (Grey Field-speedwell)
Veronica serpyllifolia (thyme-leaved speedwell)
Veronica speciosa (New Zealand hebe)
Veronica spicata (veronica, speedwell)
Veronica spicata 'Royal Candles' (Royal Candles Speedwell)
Veronica ssp. (hebe)
Veronicastrum
Veronicastrum virginicum (culver's root)
Veronica sublobata (Pink Ivy-leaved Speedwell)
Veronica × 'Tidal Pool' (Tidal Pool Speedwell)
Veronica topiaria (Topiary Hebe)
Vertebrata
Vertebrata lanosa (Wrack Siphon Weed)
Viburnum (viburnums)
Viburnum acerifolium (mapleleaf viburnum)
Viburnum × bodnantense 'Dawn' (Dawn viburnum)
Viburnum × burkwoodii (Burkwood viburnum)
Viburnum carlesii (Korean spice viburnum)
Viburnum × carlocephalum (fragrant snowball viburnum)
Viburnum cassinoides (northern wild raisin)
Viburnum davidii (David viburnum)
Viburnum dentatum (southern arrowwood)
Viburnum dilatatum (linden viburnum)
Viburnum ellipticum (Oval-leaf Viburnum)
Viburnum lantana (Wayfaring-tree)
Viburnum lantanoides (hobblebush)
Viburnum lentago (nannyberry)
Viburnum opulus 'Nanum' (dwarf European cranberry bush)
Viburnum opulus 'Roseum' (European cranberry bush)
Viburnum opulus var. americanum (American cranberry bush)
Viburnum plicatum (Japanese Snowball Bush)
Viburnum plicatum f. tomentosum (doublefile viburnum)
Viburnum prunifolium (Blackhaw)
Viburnum recognitum (northern arrowwood)
Viburnum × rhytidophylloides (lantanaphyllum viburnum)
Viburnum rhytidophyllum (leatherleaf viburnum)
Viburnum rufidulum (Rusty Blackhaw)
Viburnum tinus (Viburnum tinus)
Viburnum x burkwoodii (Burkwood Viburnum)
Vicia (Vetches)
Vicia caroliniana (Carolina Vetch)
Vicia cracca (tufted vetch)
Vicia ludoviciana (slender vetch)
Vicia sepium (Bush Vetch)
Vicia tetrasperma (Lentil Vetch)
Vicia villosa (woolly vetch)
Vigna
Vigna luteola (Wild Cowpea)
Viguiera
Viguiera dentata (Toothleaf Goldeneye)
Viminaria
Viminaria juncea (native broom)
Vinca (periwinkles)
Vinca difformis (Intermediate Periwinkle)
Vinca major (Greater Periwinkle)
Vinca major 'Variegata' (variegated vinca major)
Vinca minor (common periwinkle)
Vincetoxicum (dog-strangling vines)
Vinealobryum
Vinealobryum insulanum (Cylindric Beard-moss)
Viola adunca (Early Blue Violet)
Viola arvensis (European field pansy)
Viola banksii (Banks' Violet)
Viola betonicifolia (Mountain Violet)
Viola blanda (sweet white violet)
Viola canadensis (Canada Violet)
Viola communis (dooryard violet)
Viola cucullata (marsh blue violet)
Viola eriocarpa (Smooth Yellow Violet)
Viola glabella (Stream Violet)
Viola hastata (Halberd-leaved violet)
Viola hederacea (Ivy Leaved Violet)
Viola hirta (Hairy Violet)
Viola labradorica (Labrador violet)
Viola lutea (Mountain Pansy)
Viola minuscula (northern white violet)
Viola missouriensis (Missouri Violet)
Viola odorata (Sweet violet)
Viola palmata (three-lobed violet)
Viola palustris (Marsh Violet)
Viola pedata (bird's foot violet)
Viola pedunculata (California Golden Violet)
Viola praemorsa (Prairie Violet)
Viola primulifolia (primrose-leaved violet)
Viola purpurea (Goosefoot violet)
Viola rafinesquei (American field pansy)
Viola reichenbachiana (Early Dog-violet)
Viola riviniana (common dog-violet)
Viola rostrata (Long-spurred violet)
Viola rotundifolia (Round-leaved Violet)
Viola sempervirens (Evergreen Yellow Violet)
Viola striata (cream violet)
Viola tricolor (Wild Pansy)
Viola × williamsii (Horned pansy)
Viola × wittrockiana (pansy)
Viscum
Viscum album (European mistletoe)
Vitex (Chastetrees)
Vitex agnus-castus (chaste tree)
Vitis (grapevines)
Vitis aestivalis (summer grape)
Vitis californica (California wild grape)
Vitis cinerea (graybark grape)
Vitis labrusca (fox grape)
Vitis mustangensis (mustang grape)
Vitis riparia (riverbank grape)
Vitis rotundifolia (muscadine)
Vitis vinifera (grape)
Vitis vulpina (frost grape)
Vittadinia
Vittadinia cuneata (Purple Fuzzweed)
Vittadinia gracilis (Purple Fuzzweed)
Wahlenbergia (Capebells)
Wahlenbergia gracilis (Australian Bluebell)
Wahlenbergia stricta (Australian bluebell)
Washingtonia (Fan Palms)
Washingtonia filifera (California fan palm)
Washingtonia robusta (Mexican Fan Palm)
Watsonia (Watsonias)
Watsonia meriana (Bulbil Bugle-lily)
Wedelia
Wedelia hispida (Texas creeping-oxeye)
Weigela (Weigela bushes)
Weigela florida (weigela)
Weigela florida 'Variegata' (variegated weigela)
Westringia
Westringia eremicola (slender westringia)
Westringia fruticosa (Coastal Rosemary)
Westringia longifolia
Whipplea
Whipplea modesta (modesty)
Wikstroemia
Wikstroemia indica (Bootlace Plant)
Wilkiea
Wilkiea hugeliana (Common Wilkiea)
Wisteria (wisterias)
Wisteria floribunda (Japanese wisteria)
Wisteria sinensis (Chinese wisteria)
Wodyetia
Wodyetia bifurcata (Foxtail Palm Tree)
Wollemia nobilis (Wollemi pine)
Woodsia
Woodsia obtusa (blunt woodsia)
Woodwardia
Woodwardia areolata (netted chain fern)
Woodwardia fimbriata (Giant Chain Fern)
Woodwardia virginica (Virginia chainfern)
Woollsia
Woollsia pungens (Snow Wreath)
Wurmbea
Wurmbea dioica (Early Nancy)
Wyethia (mule's ears)
Wyethia amplexicaulis (Northern Mule's Ear)
Wyethia angustifolia (Narrow Leaf Mule Ears)
Wyethia mollis (woolly mule's ears)
Xanthisma
Xanthisma spinulosum (Spiny Goldenweed)
Xanthium (Cockleburs)
Xanthium strumarium (rough cocklebur)
Xanthorhiza
Xanthorhiza simplicissima (Shrub Yellowroot)
Xanthorrhoea (Grasstrees)
Xanthorrhoea australis (Austral Grass-tree)
Xanthorrhoea glauca (Queensland Grasstree)
Xanthorrhoea johnsonii (Forest Grasstree)
Xanthorrhoea preissii (Balga)
Xanthorrhoea quadrangulata (Yacka)
Xanthorrhoea semiplana (tufted grass-tree)
Xanthosia
Xanthosia pilosa (Woolly Xanthosia)
Xanthosoma
Xanthostemon
Xanthostemon chrysanthus (Golden Penda)
Xerochrysum
Xerochrysum bracteatum (Golden Everlasting)
Xerochrysum viscosum (sticky everlasting)
Xerophyllum
Xerophyllum tenax (Beargrass)
Xylococcus
Xylococcus bicolor (mission manzanita)
Xylomelum
Xylomelum pyriforme (Woody Pear)
Xylorhiza
Xylorhiza orcuttii (Orcutt's Woodyaster)
Xylorhiza tortifolia (Mojave Woodyaster)
Xyris (Yellow-eyed Grasses)
Youngia (Youngia)
Youngia japonica (Oriental false hawksbeard)
Yucca (Yuccas)
Yucca baccata (Banana Yucca)
Yucca brevifolia (Western Joshua Tree)
Yucca constricta (Buckley's Yucca)
Yucca elata (soaptree yucca)
Yucca filamentosa (yucca)
Yucca filamentosa 'Color Guard' (Color Guard Yucca)
Yucca glauca (Great Plains yucca)
Yucca gloriosa var. tristis (weeping yucca)
Yucca guatemalensis (Spineless Yucca)
Yucca jaegeriana (Eastern Joshua tree)
Yucca rupicola (Twisted-leaf Yucca)
Yucca schidigera (Mojave Yucca)
Yucca treculiana (Spanish dagger)
Zamia
Zamia furfuracea (Cardboard Palm Tree)
Zamia integrifolia (Coontie Palm)
Zamioculcas
Zamioculcas zamiifolia (ZZ Plant)
Zamioculcas zamiifolia 'Raven' (Raven ZZ Plant)
Zamioculcas zamiifolia (variegated) (Variegated ZZ Plant)
Zantedeschia (calla lilies)
Zantedeschia aethiopica (White Calla Lily)
Zanthoxylum (prickly-ashes)
Zanthoxylum americanum (northern prickly ash)
Zanthoxylum clava-herculis (Hercules' club)
Zelkova
Zelkova serrata (sawleaf zelkova)
Zeltnera
Zeltnera venusta (California Centaury)
Zephyranthes (Rain lilies)
Zephyranthes atamasco (Atamasco Lily)
Zephyranthes chlorosolen (Brazos rain-lily)
Zephyranthes drummondii (Drummond's rain lily)
Zieria
Zieria smithii (Sandfly Zieria)
Zingiber
Zingiber officinale (Ginger)
Zinnia (Zinnias)
Zinnia elegans (Elegant Zinnia)
Zizia (Alexanders)
Zizia aurea (Golden Alexanders)
Ziziphus (Jujubes)
Zoysia
Zoysia japonica (Zoysia Grass)