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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 distichum (White Forsythia)
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 latifolia (Yellow Sand Verbena)
Abronia umbellata (Pink Sand Verbena)
Abronia villosa (desert sand verbena)
Abutilon fruticosum (sweet Indian Mallow)
Abutilon theophrasti (velvetleaf)
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 stricta (Hop wattle)
Acacia suaveolens (Sweet Wattle)
Acacia terminalis (Sunshine Wattle)
Acacia ulicifolia (juniper wattle)
Acacia verniciflua (Varnish Wattle)
Acacia verticillata (Prickly moses)
Acaena echinata (Sheep's Burr)
Acaena novae-zelandiae (Biddy-biddy)
Acalypha rhomboidea (Common Three-seeded Mercury)
Acanthocereus tetragonus (Fairy Castle Cactus)
Acanthus mollis (bear's breech)
Acanthus spinosus (Spiny Bear's Breeches)
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 grandidentatum (bigtooth maple)
Acer griseum (paperbark maple)
Acer macrophyllum (bigleaf maple)
Acer negundo (Box Elder)
Acer palmatum (Japanese maple)
Acer palmatum 'Atropurpureum' (red Japanese maple)
Acer palmatum 'Bloodgood' (Bloodgood Japanese Maple)
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 'Wolff' (Wolff Japanese Maple)
Acer pensylvanicum (striped maple)
Acer pictum (Painted Maple)
Acer platanoides (Norway maple)
Acer platanoides 'Crimson King' (Crimson King maple)
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 saccharinum (silver maple)
Acer saccharum (sugar maple)
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 ageratifolia (Greek Yarrow)
Achillea filipendulina (Fern-leaf Yarrow)
Achillea millefolium (common yarrow)
Achillea ptarmica (Sneezewort)
Achlys triphylla (vanilla-leaf)
Acianthus caudatus (Mayfly orchid)
Acianthus fornicatus (Pixie Caps)
Acianthus pusillus (small mosquito-orchid)
Acmispon americanus (Spanish clover)
Acmispon glaber (deerweed)
Acmispon strigosus (strigose lotus)
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 imperforata (Beach Acronychia)
Acronychia laevis (glossy acronychia)
Acrotriche aggregata (Ground Berry)
Acrotriche serrulata (Honey-pots)
Actaea pachypoda (White Baneberry)
Actaea racemosa (Black Cohosh)
Actaea rubra (red baneberry)
Actaea simplex 'Black Negligee' (Black Negligee Bugbane)
Actinidia deliciosa (kiwi)
Actinotus helianthi (Flannel Flower)
Actinotus minor (Lesser Flannel Flower)
Adelinia grandis (Pacific hound's tongue)
Adenanthos terminalis (Gland Flower)
Adenium obesum (Desert Rose)
Adenocaulon bicolor (American trailplant)
Adenostoma fasciculatum (chamise)
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 merrillii (Christmas Palm)
Adoxa moschatellina (Moschatel)
Aechmea fasciata (Silver Vase Bromeliad)
Aegiceras corniculatum (river mangrove)
Aegopodium podagraria (Goutweed)
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 cynapium (Fool's parsley)
Agalinis heterophylla (Prairie False Foxglove)
Agalinis purpurea (purple false foxglove)
Agapanthus africanus (lily of the Nile)
Agapanthus praecox (blue lily)
Agastache 'Blue Fortune' (Blue Fortune Hummingbird Mint)
Agastache foeniculum (Anise Hyssop)
Agastache rupestris (Sunset Hyssop)
Agastache spp. (hyssop)
Agave americana (Century Plant)
Agave attenuata (Fox Tail Agave)
Agave deserti (desert agave)
Agave geminiflora (Twin Flower Agave Plant)
Agave palmeri (Palmer's agave)
Agave vilmoriniana (Octopus Agave)
Ageratina adenophora (Crofton Weed)
Ageratina altissima 'Chocolate' (Chocolate White Snakeroot)
Ageratina riparia (mist flower)
Agonis flexuosa (Western Australian Peppermint)
Agrimonia eupatoria (common agrimony)
Agrimonia gryposepala (tall hairy agrimony)
Agrimonia parviflora (swamp agrimony)
Agropyron cristatum (Crested Wheatgrass)
Agrostemma githago (corn cockle)
Ailanthus altissima (tree of heaven)
Aira praecox (early hair grass)
Aizoon pubescens (Coastal Galenia)
Ajuga australis (Austral Bugle)
Ajuga reptans (creeping bugleweed)
Ajuga reptans 'Chocolate Chip' (Chocolate Chip Bugleweed)
Akebia quinata (five-leaved akebia)
Albizia julibrissin (silk tree)
Alcea rosea (common hollyhock)
Alchemilla alpina (Alpine Lady's-mantle)
Alchemilla arvensis (Field Parsley Piert)
Alchemilla conjuncta (Silver Lady's Mantle)
Alchemilla mollis (Lady's Mantle)
Alchemilla vulgaris (Lady's-mantle)
Alchornea ilicifolia (Native Holly)
Alectryon tomentosus (Hairy Alectryon)
Alisma plantago-aquatica (water-plantain)
Allamanda cathartica (Allamanda Vine)
Alliaria petiolata (garlic mustard)
Allionia incarnata (Trailing Windmills)
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 '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 paradoxum (Few-flowered Leek)
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 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 humilis (dwarf sheoak)
Allocasuarina littoralis (Black sheoak)
Allocasuarina muelleriana (slaty sheoak)
Allocasuarina torulosa (Forest sheoak)
Allocasuarina verticillata (Drooping She-oak)
Alnus alnobetula (green alder)
Alnus cordata (Italian alder)
Alnus glutinosa (common alder)
Alnus rhombifolia (white alder)
Alnus rubra (red alder)
Alnus serrulata (smooth alder)
Alocasia brisbanensis (Cunjevoi)
Alocasia odora (Upright Elephant Ear)
Alocasia reginula (Black Velvet Alocasia)
Alocasia zebrina (Zebra Alocasia)
Aloe vera (Aloe Vera)
Alopecurus geniculatus (Marsh foxtail)
Alopecurus pratensis (Meadow Foxtail)
Aloysia gratissima (Whitebrush)
Alphitonia excelsa (Red Ash)
Alpinia caerulea (Native Ginger)
Alpinia purpurata (Red Ginger)
Alstonia constricta (Bitterbark)
Alternanthera denticulata (Lesser Joyweed)
Alternanthera philoxeroides (Alligatorweed)
Althaea officinalis (marsh mallow)
Alyxia buxifolia (Sea Box)
Alyxia ruscifolia (Chain Fruit)
Amaranthus palmeri (Palmer's Amaranth)
Amaryllis belladonna (Belladonna Lily)
Amauropelta noveboracensis (New York fern)
Amblystegium serpens (creeping feather-moss)
Ambrosia artemisiifolia (common ragweed)
Ambrosia chamissonis (silver beachweed)
Ambrosia dumosa (Burrobush)
Ambrosia psilostachya (western ragweed)
Ambrosia salsola (Cheesebush)
Ambrosia trifida (giant ragweed)
Amelanchier alnifolia (serviceberry)
Amelanchier arborea (common serviceberry)
Amelanchier grandiflora (Apple Serviceberry)
Amelanchier ssp. (serviceberry)
Amelanchier utahensis (Utah Serviceberry)
Amorpha canescens (leadplant)
Amorpha fruticosa (false indigo bush)
Ampelopsis cordata (heart leaf peppervine)
Ampelopsis glandulosa (Porcelain Berry)
Amperea xiphoclada (Broom Spurge)
Amphibolis antarctica (Sea Nymph)
Amphicarpaea bracteata (American hog-peanut)
Amsinckia menziesii (Common Fiddleneck)
Amsinckia tessellata (Bristly Fiddleneck)
Amsonia ciliata (Fringed Bluestar)
Amsonia hubrichtii (Arkansas Bluestar)
Amsonia illustris (Shining Bluestar)
Amsonia tabernaemontana (Eastern Bluestar)
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 morio (green-winged orchid)
Anacamptis pyramidalis (pyramidal orchid)
Ananas comosus (Pineapple Plant)
Anaphalis margaritacea (pearly everlasting)
Anaphalis triplinervis (Triple-Veined Pearly Everlasting)
Anasa tristis (Squash Bug)
Anatherum tenuispatheum (Maritime Bushy Bluestem)
Anatherum virginicum (broomsedge bluestem)
Anchusa arvensis (small bugloss)
Anchusa azurea (Italian bugloss)
Anchusa officinalis (common bugloss)
Andersonglossum virginianum (wild comfrey)
Andropogon gerardi (big bluestem)
Andropogon gerardii (Big Bluestem)
Andropogon ternarius (Splitbeard Bluestem)
Andropogon virginicus (Broomsedge Bluestem)
Aneilema acuminatum (Pointed Aneilema)
Anemanthele lessoniana (New Zealand Wind Grass)
Anemonastrum canadense (Canada anemone)
Anemone berlandieri (Tenpetal Anemone)
Anemone blanda (windflower)
Anemone coronaria (poppy anemone)
Anemone nemorosa (wood anemone)
Anemone virginiana (tall thimbleweed)
Anemone x hybrida (Japanese anemone)
Anemonoides apennina (Blue Anemone)
Anemonoides blanda (Greek Anemone)
Anemonoides nemorosa (wood anemone)
Anemonoides quinquefolia (wood anemone)
Anemonoides ranunculoides (Yellow Anemone)
Anemonopsis macrophylla (False Anemone)
Anemopsis californica (Yerba Mansa)
Anethum graveolens (Dill)
Angelica archangelica (Garden angelica)
Angelica atropurpurea (purple-stemmed angelica)
Angelica gigas (Korean Angelica)
Angelica sylvestris (Wild Angelica)
Angophora costata (Smooth-barked apple)
Angophora floribunda (Rough-barked Apple)
Angophora hispida (Dwarf apple)
Angophora leiocarpa (Smooth-barked Apple)
Anigozanthos humilis (Catspaw)
Anigozanthos manglesii (Red and Green Kangaroo Paw)
Annona muricata (Soursop)
Annona squamosa (Sugar Apple)
Anopterus glandulosus (Tasmanian laurel)
Anredera cordifolia (Mignonette vine)
Antennaria plantaginifolia (plantain-leaved pussytoes)
Anthemis cotula (chamomile)
Anthoxanthum odoratum (sweet vernal grass)
Anthriscus caucalis (Bur Parsley)
Anthriscus cerefolium (Chervil)
Anthriscus sylvestris (wild chervil)
Anthurium andraeanum (Flamingo Flower)
Anthurium clarinervium (Velvet Cardboard Anthurium)
Anthyllis vulneraria (Common Kidney-Vetch)
Anticlea elegans (Mountain Deathcamas)
Antigonon leptopus (Coral Vine)
Antirrhinum majus (snapdragon)
Aotus ericoides (Common Aotus)
Aphananthe philippinensis (Axe handle Wood)
Apios americana (American groundnut)
Apium prostratum (Sea Celery)
Aplectrum hyemale (putty root)
Apocissus antarctica (Kangaroo Vine)
Apocissus hypoglauca (Five-Leaved Water Vine)
Apocynum cannabinum (hemp dogbane)
Aponogeton natans (floating water hawthorn)
Apopellia endiviifolia (Endive Pellia)
Aquilegia canadensis (Wild Columbine)
Aquilegia coerulea (blue columbine)
Aquilegia vulgaris (columbine)
Arabidopsis lyrata (Lyreleaf Rockcress)
Arabidopsis thaliana (mouse-ear cress)
Arachniodes simplicior (Variegated Holly Fern)
Aralia elata (Japanese angelica tree)
Aralia nudicaulis (wild sarsaparilla)
Aralia racemosa (American spikenard)
Aralia spinosa (devil's walkingstick)
Araucaria araucana (Monkey Puzzle Tree)
Araucaria bidwillii (Bunya Pine)
Araucaria cunninghamii (Hoop pine)
Araucaria heterophylla (Norfolk Island Pine)
Araujia sericifera (Moth Vine)
Arbutus 'Marina' (Marina Strawberry Tree)
Arbutus menziesii (madrone)
Arbutus unedo (strawberry tree)
Arbutus x andrachnoides
Archontophoenix cunninghamiana (Piccabeen Palm)
Arctium lappa (greater burdock)
Arctium minus (burrdock)
Arctium tomentosum (Woolly Burdock)
Arctostaphylos columbiana (hairy manzanita)
Arctostaphylos glauca (Big Berry Manzanita)
Arctostaphylos patula (greenleaf manzanita)
Arctostaphylos pungens (pointleaf manzanita)
Arctostaphylos spp. (manzanita)
Arctostaphylos uva-ursi (kinnikinnick)
Arctotheca calendula (Capeweed)
Ardisia crenata (Coralberry)
Arenaria serpyllifolia (Thyme-leaved Sandwort)
Argemone albiflora (white prickly poppy)
Argemone polyanthemos (thistle poppy)
Argentina anserina (common silverweed)
Argentipallium obtusifolium (Blunt everlasting)
Aria edulis (Whitebeam)
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 proboscideum (Mouse Plant)
Aristida purpurea (Purple Threeawn)
Armeria maritima (sea thift)
Armoracia rusticana (Horseradish)
Arnica cordifolia (heartleaf arnica)
Arnoglossum atriplicifolium (pale Indian plantain)
Aronia arbutifolia (red chokeberry)
Arrhenatherum elatius (tall oat grass)
Artemisia abrotanum (Southernwood)
Artemisia californica (California sagebrush)
Artemisia douglasiana (California mugwort)
Artemisia dracunculus (French Tarragon)
Artemisia frigida (fringed sagebrush)
Artemisia lactiflora (White Mugwort)
Artemisia ludoviciana (Silver Wormwood)
Artemisia pontica (Roman Wormwood)
Artemisia 'Powis Castle' (Powis Castle Artemisia)
Artemisia pycnocephala (coastal sagewort)
Artemisia tridentata (Big Sagebrush)
Artemisia vulgaris (common mugwort)
Arthropodium candidum (White Rock Lily)
Arthropodium fimbriatum (Nodding Chocolate Lily)
Arthropodium milleflorum (pale vanilla lily)
Arthropodium strictum (chocolate lily)
Arthropteris tenella (Climbing Fern)
Arum italicum (lords and ladies)
Arum maculatum (Cuckoo-pint)
Aruncus dioicus (goatsbeard)
Arundinaria gigantea (river cane)
Arundinaria tecta (switch cane)
Arundo donax (giant reed)
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 asperula (Antelopehorn Milkweed)
Asclepias curassavica (tropical milkweed)
Asclepias eriocarpa (woollypod milkweed)
Asclepias exaltata (poke milkweed)
Asclepias incarnata (Swamp Milkweed)
Asclepias oenotheroides (Zizotes milkweed)
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 triloba (Pawpaw)
Asparagus aethiopicus (African Asparagus)
Asparagus asparagoides (Cape Smilax)
Asparagus officinalis (wild asparagus)
Asparagus scandens (Climbing asparagus)
Asperula conferta (Common Woodruff)
Asphodelus fistulosus (Onion-Leafed Asphodel)
Aspidistra elatior (Cast Iron Plant)
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 trichomanes (Maidenhair Spleenwort)
Aster novi-belgii (New York Aster)
Aster spp. (aster)
Astilbe spp. (astilbe)
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 maxima (Large Masterwort)
Astrotricha latifolia (Broad-leaf Star Hair)
Athyrium angustum (northern lady fern)
Athyrium asplenioides (southern lady fern)
Athyrium filix-femina (lady fern)
Athyrium filix-femina 'Frizelliae' (Tatting Fern)
Athyrium 'Ghost' (Ghost Fern)
Athyrium niponicum 'Pictum' (Japanese Painted Fern)
Athyrium otophorum (Eared Lady Fern)
Atractocarpus fitzalanii (Brown Gardenia)
Atrichum angustatum (lesser smoothcap)
Atrichum undulatum (Catherine's moss)
Atriplex canescens (Fourwing Saltbush)
Atriplex cinerea (Grey Saltbush)
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 bella-donna (Deadly Nightshade)
Aubrieta deltoidea (purple rock cress)
Aucuba japonica (Japanese aucuba)
Aucuba japonica 'Gold Dust' (Gold Dust aucuba)
Aucuba japonica 'Mr. Goldstrike' (Mr. Goldstrike Aucuba)
Austromyrtus dulcis (Midgen Berry)
Austrosteenisia blackii (Blood Vine)
Austrostipa mollis (soft speargrass)
Avena fatua (wild oat)
Avena sativa (Common Oat)
Avenella flexuosa (wavy hair-grass)
Avicennia germinans (black mangrove)
Avicennia marina (Grey Mangrove)
Azadirachta indica (Neem Tree)
Azara microphylla (Boxleaf azara)
Azolla pinnata (Feathered Mosquito Fern)
Azolla rubra (Red Azolla)
Baccharis halimifolia (groundsel tree)
Baccharis neglecta (Poverty Weed)
Baccharis salicifolia (mule fat)
Baccharis sarothroides (Desert Broom)
Backhousia myrtifolia (Grey Myrtle)
Bacopa monnieri (Herb-of-Grace)
Bahiopsis parishii (Parish's Goldeneye)
Baileya multiradiata (Desert Marigold)
Ballota nigra (Black Horehound)
Baloskion tetraphyllum (tassel cord-rush)
Balsamorhiza sagittata (arrowleaf balsamroot)
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 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)
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 vulgaris (bitter wintercress)
Barbula calycina
Barbula unguiculata (Bird's-Claw Beard-Moss)
Bassia scoparia (summer-cypress)
Bauera rubioides (River Rose)
Bauhinia blakeana (Hong Kong Orchid Tree)
Beaucarnea recurvata (Ponytail Palm)
Bebbia juncea (Sweetbush)
Bedfordia arborescens (Blanket Leaf)
Bedfordia salicina (Blanket Bush)
Beesia deltophylla (beesia)
Begonia grandis ssp. evansiana (Hardy Begonia)
Begonia × semperflorens-cultorum (wax begonia)
Begonia × tuberhybrida (Tuberous Begonia)
Belamcanda chinensis (Blackberry Lily)
Bellendena montana (Mountain Rocket)
Bellis perennis (Lawn daisy)
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 japonica (Japanese Mahonia)
Berberis julianae (Wintergreen barberry)
Berberis nervosa (Oregon-grape)
Berberis repens (creeping mahonia)
Berberis thumbergii 'Orange Rocket' (Orange Rocket Barberry)
Berberis thunbergii 'Aurea' (golden Japanese 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 trifoliolata (Agarita)
Berberis verruculosa (Warty barberry)
Berberis x gladwynensis (Gladwyne barberry)
Berberis x gladwynensis 'William Penn' (William Penn barberry)
Bergenia ciliata (Frilly Bergenia)
Bergenia crassifolia (Heartleaf bergenia)
Bergenia spp. (bergenia)
Berteroa incana (hoary alyssum)
Berula erecta (cutleaf water parsnip)
Betonica officinalis (common hedge-nettle)
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)
Bidens aristosa (Bearded Beggarticks)
Bidens bipinnata (Spanish needles)
Bidens cernua (Nodding Beggarticks)
Bidens frondosa (Devil's Beggarticks)
Bidens pilosa (Hairy Beggarticks)
Bigelowia nuttallii (Nuttall's Rayless Goldenrod)
Billardiera cymosa (sweet apple-berry)
Billardiera fusiformis (Australian Bluebell)
Billardiera mutabilis (Common Apple-berry)
Billardiera scandens (Apple Berry)
Bismarckia nobilis (Bismarck Palm)
Bistorta amplexicaulis (red bistort)
Bistorta bistortoides (American bistort)
Bistorta officinalis (common bistort)
Blackstonia perfoliata (Yellow-wort)
Blandfordia nobilis (Christmas Bells)
Blechnum nudum (Fishbone water-fern)
Blechnum penna-marina (Alpine Water Fern)
Blechnum wattsii (Hard Water-fern)
Boehmeria cylindrica (false nettle)
Bolboschoenus maritimus (sea clubrush)
Borago officinalis (borage)
Borodinia laevigata (smooth rockcress)
Boronia ledifolia (Sydney Boronia)
Boronia pinnata (Pink Boronia)
Boronia rosmarinifolia (Pink Boronia)
Borrichia frutescens (sea ox-eye)
Bossiaea cinerea (Showy Bossiaea)
Bossiaea heterophylla (Variable Bossiaea)
Bossiaea obcordata (Spiny Bossiaea)
Bossiaea prostrata (creeping bossiaea)
Bothriochloa ischaemum (King Ranch bluestem)
Bothriochloa torreyana (silver bluestem)
Botrypus virginianus (rattlesnake fern)
Bougainvillea spectabilis (Bougainvillea)
Bouteloua curtipendula (Sideoats Grama)
Bouteloua gracilis (Blue Grama Grass)
Bowlesia incana (hoary bowlesia)
Brachychiton acerifolius (flame tree)
Brachychiton populneus (kurrajong)
Brachychiton rupestris (Queensland Bottle Tree)
Brachyglottis Dunedin Hybrid 'Sunshine' (Sunshine Daisy Bush)
Brachyloma daphnoides (Daphne heath)
Brachyloma ericoides (brush heath)
Brachypodium sylvaticum (Slender False Brome)
Brachyscome ciliaris (Variable Daisy)
Brachyscome multifida (cut-leaved daisy)
Brachyscome spathulata (Spoon Daisy)
Brachythecium albicans (Whitish Feather-moss)
Brachythecium rutabulum (Rough-stalked Feather-moss)
Brasenia schreberi (Watershield)
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 affinis (Red-heart Moss)
Breynia oblongifolia (coffee bush)
Brickellia californica (California Brickellbush)
Briza media (Quaking-grass)
Briza minor (Little quaking-grass)
Bromus catharticus (Rescue Brome)
Bromus diandrus (great brome)
Bromus hordeaceus (common soft brome)
Bromus inermis (smooth brome)
Bromus rubens (Red Brome)
Bromus sitchensis (Alaska brome)
Bromus sterilis (barren brome)
Broussonetia papyrifera (Paper mulberry)
Brugmansia suaveolens (Angel's Trumpet)
Bruguiera gymnorhiza (orange mangrove)
Brunfelsia pauciflora (Yesterday-Today-and-Tomorrow)
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 australis (blue pincushion)
Brunoniella australis (Blue Trumpet)
Bryoandersonia illecebra (spoon-leaved moss)
Bryonia cretica (White Bryony)
Bryum argenteum (Silvery Bryum)
Buchnera floridana (Florida bluehearts)
Buddleja davidii (butterfly bush)
Buddleja globosa (globe butterfly bush)
Buglossoides arvensis (corn gromwell)
Bulbine bulbosa (Bulbine Lily)
Buphthalmum salicifolium (Willowleaf Ox-eye)
Bupleurum longifolium (Long-leaved Hare's Ear)
Burchardia congesta (Milkmaids)
Burchardia umbellata (Milkmaids)
Bursaria spinosa (Australian Blackthorn)
Bursera simaruba (Gumbo Limbo)
Butia capitata (Pindo Palm)
Butia odorata (Jelly Palm)
Butomus umbellatus (flowering rush)
Buxus sempervirens (English Boxwood)
Buxus sempervirens 'Aureovariegata' (Golden Variegated Boxwood)
Buxus sempervirens 'Suffruticosa' (Dwarf English Boxwood)
Caesalpinia pulcherrima (peacock flower)
Caesia calliantha (blue grass lily)
Caesia parviflora (Pale Grass Lily)
Cakile edentula (American searocket)
Cakile maritima (European Searocket)
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 bicolor (Caladium)
Calamagrostis arenaria (European marram grass)
Calamagrostis brachytricha (Korean Feather Reed Grass)
Calamagrostis canadensis (bluejoint)
Calamagrostis epigejos (Bushgrass)
Calamintha nepeta ssp. nepeta (calamint)
Calamus muelleri (Wait-a-while)
Calandrinia menziesii (redmaids)
Calanthe triplicata (Christmas Orchid)
Caleana major (Large Flying Duck Orchid)
Calliandra haematocephala (Pink Powder Puff)
Callicarpa bodinieri (beautyberry)
Callicarpa bodinieri var. 'Profusion' (Profusion Beautyberry)
Callicarpa dichotoma (Purple Beautyberry)
Callicladium imponens (brocade moss)
Callicoma serratifolia (Callicoma)
Calliergonella cuspidata (Pointed Spear-moss)
Callirhoe involucrata (winecup mallow)
Callisia repens (Turtle Vine)
Callistemon citrinus (Red Cluster Bottlebrush)
Callitriche stagnalis (Pond water-starwort)
Callitris glaucophylla (White Cypress-pine)
Callitris gracilis (Slender Cypress-pine)
Callitris rhomboidea (Oyster Bay cypress-pine)
Callitropsis nootkatensis (Alaska Cedar)
Callitropsis nootkatensis 'Pendula' (weeping Alaska yellow cedar)
Calluna vulgaris (Scotch Heather)
Calluna vulgaris 'Firefly' (Firefly Heather)
Calluna vulgaris 'Spring Torch' (Spring Torch Heather)
Calocedrus decurrens (incense cedar)
Calochilus campestris (copper beard orchid)
Calochilus paludosus (red beard orchid)
Calochilus robertsonii (Purple Beard Orchid)
Calochlaena dubia (Common Ground Fern)
Calochortus albus (White Globe Lily)
Calochortus gunnisonii (Gunnison's Mariposa Lily)
Calochortus leichtlinii (Leichtlin's Mariposa Lily)
Calochortus luteus (Yellow Mariposa Lily)
Calochortus splendens (Splendid Mariposa Lily)
Calochortus tolmiei (Tolmie's pussy ears)
Calochortus venustus (Butterfly Mariposa Lily)
Calotis cuneifolia (Purple Burr-daisy)
Calotis lappulacea (Bur Daisy)
Caltha palustris (marsh marigold)
Calycanthus floridus (Carolina sweetshrub)
Calyptocarpus vialis (straggler daisy)
Calyptridium monospermum (One-seeded Pussypaws)
Calystegia macrostegia (coast morning glory)
Calystegia sepium (hedge bindweed)
Calystegia silvatica (large bindweed)
Calystegia soldanella (Sea Bindweed)
Calytrix tetragona (Fringe Myrtle)
Camassia cusickii (Cusick's Camas)
Camassia quamash (common camas)
Camassia scilloides (Atlantic camas)
Camellia japonica (Hot Flash Camellia)
Camellia japonica (Japanese 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 cheiranthifolia (beach suncup)
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 americanum (tall bellflower)
Campanula trachelium (Nettle-leaved Bellflower)
Camphora officinarum (Camphor)
Campylopus introflexus (Heath Star-moss)
Cananga odorata (Ylang-Ylang)
Canavalia rosea (Beach Bean)
Canna glauca (Water Canna)
Capnoides sempervirens (rock harlequin)
Capparis arborea (Brush Caper Berry)
Capsella bursa-pastoris (shepherd's purse)
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 'Habanero' (Habanero Pepper)
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 pensylvanica (Pennsylvania Bittercress)
Cardamine pratensis (Cuckooflower)
Cardamine trifolia (toothwort)
Cardiocrinum giganteum (giant Himalayan lily)
Cardiospermum grandiflorum (Showy Balloon Vine)
Cardiospermum halicacabum (Lesser Balloon Vine)
Carduus crispus (Welted Thistle)
Carduus nutans (musk thistle)
Carduus pycnocephalus (Italian thistle)
Carduus tenuiflorus (slenderflower thistle)
Carex acutiformis (lesser pond sedge)
Carex albicans (White-Tinged Sedge)
Carex amphibola (Creek Sedge)
Carex appalachica (Appalachian Sedge)
Carex appressa (Southern Cutty 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 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 morrowii 'Variegata' (Japanese Sedge)
Carex muskingumensis (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
Carex pensylvanica (Pennsylvania Sedge)
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 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 texensis (Texas Sedge)
Carex umbrosa (shade sedge)
Carex vulpina (fox sedge)
Carex vulpinoidea (Fox Sedge)
Carex woodii (Wood's Sedge)
Carissa macrocarpa (Natal Plum)
Carissa ovata (conkerberry)
Carlina vulgaris (Carline Thistle)
Carnegiea gigantea (saguaro)
Carpinus betulus (European Hornbeam)
Carpinus betulus 'Fastigiata' (narrow European hornbeam)
Carpinus caroliniana (American Hornbeam)
Carpinus cordata (Heartleaf Hornbeam)
Carpinus japonica (Japanese Hornbeam)
Carpobrotus chilensis (Chilean sea fig)
Carpobrotus edulis (sea fig)
Carpobrotus glaucescens (Angular Sea-fig)
Carpobrotus rossii (Australian Pig Face)
Carya cordiformis (bitternut hickory)
Carya glabra (pignut hickory)
Carya illinoinensis (pecan)
Carya ovata (shagbark hickory)
Carya tomentosa (mockernut)
Cassinia aculeata (Australian Tauhinu)
Cassinia longifolia (Shiny Cassinia)
Cassinia sifton (Sifton Bush)
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 sativa (Sweet Chestnut)
Castanopsis cuspidata (Japanese Chinquapin)
Castanospermum australe (Blackbean)
Castilleja affinis (Coast Paintbrush)
Castilleja applegatei (wavyleaf paintbrush)
Castilleja chromosa (Desert Paintbrush)
Castilleja exserta (purple owl's-clover)
Castilleja foliolosa (woolly paintbrush)
Castilleja indivisa (Texas Paintbrush)
Castilleja integra (Wholeleaf Paintbrush)
Castilleja linariifolia (Wyoming Paintbrush)
Casuarina cunninghamiana (River sheoak)
Casuarina equisetifolia (Beach Sheoak)
Casuarina glauca (Swamp sheoak)
Catalpa bignonioides 'Aurea' (Golden Indian Bean Tree)
Catalpa bignonioides 'Nana' (Umbrella Catalpa)
Catalpa speciosa (Northern Catalpa)
Catalpa spp. (catalpa)
Catapodium rigidum (Fern-grass)
Catharanthus roseus (Vinca / Periwinkle)
Caulophyllum thalictroides (Blue Cohosh)
Causonis clematidea (Slender Grape)
Caustis flexuosa (Curly Wig)
Ceanothus americanus (New Jersey tea)
Ceanothus gloriosus (Point Reyes ceanothus)
Ceanothus integerrimus (deerbrush ceanothus)
Ceanothus leucodermis (chaparral whitethorn)
Ceanothus 'Victoria' (Victoria ceanothus)
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 speciosa (Pink Silk Floss Tree)
Celastrus orbiculatus (Asian bittersweet)
Celosia argentea (Cockscomb)
Celtis laevigata (sugar hackberry)
Celtis occidentalis (common hackberry)
Celtis pallida (spiny hackberry)
Celtis reticulata (netleaf hackberry)
Celtis sinensis (Chinese Hackberry)
Cenchrus ciliaris (buffelgrass)
Cenchrus clandestinus (Kikuyu Grass)
Cenchrus setaceus (Fountain Grass)
Centaurea cyanus (Cornflower)
Centaurea debeauxii (Chalk Knapweed)
Centaurea diffusa (diffuse knapweed)
Centaurea jacea (Brown Knapweed)
Centaurea melitensis (Maltese star-thistle)
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 erythraea (Common centaury)
Centaurium pulchellum (Lesser Centaury)
Centaurium tenuiflorum (Slender Centaury)
Centella asiatica (Indian pennywort)
Centranthus ruber (Red Valerian)
Centrosema virginianum (butterfly pea)
Cephalanthera damasonium (white helleborine)
Cephalanthus occidentalis (Buttonbush)
Cephalaria gigantea (Giant Scabious)
Cephalocereus senilis (Old Man Cactus)
Cephalotaxus fortunei (Chinese Plum Yew)
Cephalotaxus harringtonia (Japanese Plum Yew)
Cephalotaxus harringtonia (Japanese Plum Yew)
Cerastium arvense (field chickweed)
Cerastium glomeratum (Sticky mouse-ear chickweed)
Ceratocapnos claviculata (Climbing Corydalis)
Ceratodon purpureus (Redshank)
Ceratopetalum apetalum (coachwood)
Ceratopetalum gummiferum (New South Wales christmas bush)
Ceratophyllum demersum (coontail)
Ceratostigma plumbaginoides (Leadwort)
Ceratostigma willmottianum (Chinese Plumbago)
Cercidiphyllum japonicum (katsura)
Cercidiphyllum japonicum 'Pendulum' (weeping katsura)
Cercis canadensis (redbud)
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 betuloides (Birchleaf Mountain Mahogany)
Ceropegia woodii (String of Hearts)
Chaenomeles speciosa (flowering quince)
Chaerophyllum tainturieri (Tainturier's chervil)
Chaerophyllum temulum (Rough chervil)
Chamaecrista fasciculata (partridge pea)
Chamaecrista nictitans (sensitive pea)
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 calyculata (leatherleaf)
Chamaedorea cataractarum (Cat Palm)
Chamaedorea elegans (Parlor Palm)
Chamaedorea seifrizii (Bamboo Palm)
Chamaerops humilis (European Fan Palm)
Chamaescilla corymbosa (Blue Stars)
Chamerion angustifolium (fireweed)
Chasmanthium latifolium (Northern Sea Oats)
Chasmanthium laxum (Slender Woodoats)
Cheilanthes austrotenuifolia (Rock Fern)
Cheilanthes sieberi (cloak fern)
Chelidonium diphyllum (Celandine Poppy)
Chelidonium majus (Greater celandine)
Chelone glabra (White Turtlehead)
Chelone obliqua (Rose Turtlehead)
Chelonopsis yagiharana (Yagihara Chelonopsis)
Chenopodiastrum murale (nettle-leaved goosefoot)
Chenopodium album (lambsquarters)
Chenopodium nutans (Climbing saltbush)
Chenopodium parabolicum (Fragrant Saltbush)
Chenopodium robertianum (Saloop)
Chiloglottis valida (large bird-orchid)
Chilopsis linearis (desert willow)
Chimaphila maculata (striped wintergreen)
Chimaphila umbellata (pipsissewa)
Chimonanthus praecox (Wintersweet)
Chionanthus retusus (Chinese Fringetree)
Chionanthus virginicus (White Fringetree)
Chionodoxa luciliae (Glory of the Snow)
Chloris gayana (Rhodes Grass)
Chloris truncata (black windmill grass)
Chlorogalum pomeridianum (wavy-leafed soap plant)
Chlorophytum comosum (Spider Plant)
Choisya 'Aztec Pearl' (Mexican Orange Blossom)
Choisya ternata (Mexican Orange Blossom)
Choisya ternata 'Sundance' (Golden Mexican Orange Blossom)
Chondrus crispus (Irish Moss)
Chorispora tenella (crossflower)
Christella dentata (Soft Fern)
Chrozophora tinctoria (dyer's croton)
Chrysanthemum × morifolium (Garden Mum)
Chrysobalanus icaco (Cocoplum)
Chrysocephalum baxteri (Fringed Everlasting)
Chrysocephalum semipapposum (clustered everlasting)
Chrysolepis chrysophylla (Golden Chinquapin)
Chrysopsis mariana (Maryland golden-aster)
Chrysosplenium oppositifolium (Opposite-leaved Golden-saxifrage)
Chrysothamnus viscidiflorus (Yellow Rabbitbrush)
Chylismia claviformis (Browneyes)
Cicerbita macrophylla (Common Blue-sow-thistle)
Cichorium intybus (chicory)
Cicuta maculata (water hemlock)
Cimicifuga racemosa (black bugbane)
Cinnamomum verum (True Cinnamon)
Circaea canadensis (broadleaf enchanter's nightshade)
Circaea lutetiana (enchanter's-nightshade)
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 occidentale (Cobwebby Thistle)
Cirsium palustre (Marsh Thistle)
Cirsium texanum (Texas Thistle)
Cirsium undulatum (wavyleaf thistle)
Cirsium vulgare (bull thistle)
Cissus trifoliata (sorrelvine)
Cistus albidus (white-leaved cistus)
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
Citrus australasica (Finger Lime)
Citrus × floridana (Limequat)
Citrus × meyeri (Meyer Lemon)
Citrus × microcarpa (Calamansi)
Citrus trifoliata (trifoliate orange)
Cladrastis kentukea (American Yellowwood)
Claoxylon australe (Brittlewood)
Clarkia purpurea (Winecup Clarkia)
Clarkia rubicunda (ruby chalice clarkia)
Clarkia unguiculata (Elegant Clarkia)
Claytonia caroliniana (Carolina Springbeauty)
Claytonia lanceolata (Lanceleaf Springbeauty)
Claytonia sibirica (Siberian miner's-lettuce)
Claytonia virginica (Virginia Springbeauty)
Clematicissus opaca (Pepper Vine)
Clematis 'Alionushka' (Alionushka Clematis)
Clematis aristata (Australian Clematis)
Clematis armandii (Armand Clematis)
Clematis 'Betty Corning' (Betty Corning Clematis)
Clematis cirrhosa (early clematis)
Clematis 'Constance' (Constance Clematis)
Clematis drummondii (Old Man's Beard Clematis)
Clematis 'Duchess of Albany' (Duchess of Albany Clematis)
Clematis durandii (Durand's Clematis)
Clematis 'Etoile Violette' (Etoile Violette Clematis)
Clematis glycinoides (Headache Vine)
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 patens (spreading clematis)
Clematis 'Polish Spirit' (Polish Spirit Clematis)
Clematis pubescens (Common Clematis)
Clematis spp. (clematis)
Clematis terniflora (Sweet Autumn Clematis)
Clematis virginiana (virgin's-bower)
Clematis vitalba (travelers-joy)
Cleome hassleriana (Spider Flower)
Cleome houtteana (Spider flower)
Cleomella arborea (Bladderpod)
Cleomella serrulata (Rocky Mountain Beeplant)
Clerodendrum floribundum (Lolly Bush)
Clerodendrum tomentosum (Downy Chance)
Clerodendrum trichotomum (harlequin glorybower)
Clethra alnifolia (summersweet, sweet pepperbush)
Clethra alnifolia 'Hummingbird' (Hummingbird Summersweet)
Climacium americanum (American Tree Moss)
Clinopodium vulgare (Wild Basil)
Clintonia andrewsiana (Andrews' Clintonia)
Clintonia borealis (bluebead lily)
Clintonia uniflora (bead lily)
Clitoria mariana (Pigeonwings)
Clusia rosea (Autograph Tree)
Cnidoscolus stimulosus (spurge nettle)
Cnidoscolus texanus (Texas Bull Nettle)
Coccoloba uvifera (Sea Grape)
Cochemiea dioica (Peninsular fishhook cactus)
Cochemiea grahamii (Graham's nipple cactus)
Cochlearia danica (Danish Scurvy-grass)
Cochlearia officinalis (Scurvy grass)
Cocos nucifera (Coconut Palm)
Codium fragile (Dead Man's Fingers)
Coffea arabica (Coffee Plant)
Colchicum autumnale (Autumn Crocus)
Colchicum 'Waterlily' (Waterlily Autumn Crocus)
Coleus australis (little spurflower)
Coleus scutellarioides (Coleus)
Collinsia heterophylla (Purple Chinese Houses)
Collinsia parviflora (small-flowered blue-eyed mary)
Collinsonia canadensis (citronella horse balm)
Collomia grandiflora (grand collomia)
Comandra umbellata (bastard toadflax)
Comarum palustre (marsh cinquefoil)
Combretum rotundifolium (Monkey's Brush Plant)
Comesperma calymega (Blue Spike Milkwort)
Comesperma ericinum (Pink Matchheads)
Comesperma volubile (Love Creeper)
Commelina communis (Asiatic dayflower)
Commelina cyanea (scurvy weed)
Commelina dianthifolia (Birdbill Dayflower)
Commelina diffusa (climbing dayflower)
Commelina erecta (whitemouth dayflower)
Commersonia bartramia (Brown Kurrajong)
Comptonia peregrina (Sweet Fern)
Condalia hookeri (Brasil)
Condea emoryi (desert lavender)
Conium maculatum (poison hemlock)
Conocarpus erectus (Green Buttonwood)
Conocephalum conicum (Great Scented Liverwort)
Conocephalum salebrosum (Snakewort)
Conoclinium coelestinum (Blue Mistflower)
Conopholis americana (American cancer-root)
Conopodium majus (Pignut)
Conospermum longifolium (Smoke Bush)
Conospermum taxifolium (Paint Brush)
Convallaria majalis (lily of the valley)
Convolvulus angustissimus (Blushing Bindweed)
Convolvulus arvensis (field bindweed, morning glory)
Convolvulus equitans (Texas bindweed)
Coprosma hirtella (Rough Coprosma)
Coprosma quadrifida (Prickly Currant-Bush)
Coprosma repens (Taupata)
Coptis trifolia (threeleaf goldthread)
Corallina officinalis (Common Coralline)
Corallorhiza maculata (spotted coralroot)
Cordia boissieri (Anacahuita)
Cordyline fruticosa (Ti Plant)
Cordyline petiolaris (Broad leaved Palm Lily)
Cordyline rubra (red-fruited palm lily)
Cordyline stricta (Slender Palm Lily)
Coreopsis lanceolata (Lance-Leaved Coreopsis)
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 filaginifolia (California Aster)
Coriandrum sativum (Cilantro)
Cornus alba 'Elegantissima' (variegated Tartarian dogwood)
Cornus alba 'Kesselringii' (Kesselring's Dogwood)
Cornus alternifolia (Pagoda Dogwood)
Cornus amomum (silky dogwood)
Cornus canadensis (bunchberry)
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 'Rubra' (pink dogwood)
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 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 cotoneaster (Wire-netting Bush)
Coronidium elatum (white paper daisy)
Coronidium scorpioides (button everlasting)
Correa alba (White Correa)
Correa glabra (rock correa)
Correa reflexa (Common Correa)
Cortaderia selloana (Pampas Grass)
Cortaderia selloana 'Pumila' (Dwarf Pampas Grass)
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 glabrescens (Fragrant Winter Hazel)
Corylopsis sinensis (Chinese Winter Hazel)
Corylopsis spicata (Spike Winter Hazel)
Corylus avellana 'Contorta' (Harry Lauder's walking stick)
Corylus colurna (Turkish Hazelnut)
Corylus cornuta (hazel)
Corylus maxima 'Purpurea' (purple‑leaf filbert)
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 atrosanguineus (chocolate cosmos)
Cosmos sulphureus (Yellow Cosmos)
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 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)
Cotula australis (Common Cotula)
Cotula coronopifolia (brass buttons)
Crambe maritima (Sea Kale)
Craspedia variabilis (Common Billy buttons)
Crassocephalum crepidioides (redflower ragleaf)
Crassula decumbens (Scilly Pigmyweed)
Crassula helmsii (New Zealand pygmyweed)
Crassula ovata (Jade Plant)
Crassula sieberiana (Australian Stonecrop)
Crataegus douglasii (Black Hawthorn)
Crataegus germanica (Medlar)
Crataegus laevigata (English Hawthorn)
Crataegus laevigata 'Paul's Scarlet' (Paul's Scarlet hawthorn)
Crataegus monogyna (common hawthorn)
Crataegus mordenensis (Morden Hawthorn)
Crataegus x lavallei (Lavalle hawthorn)
Crepis biennis (Rough Hawk's-beard)
Crepis vesicaria (Beaked Hawksbeard)
Crinum americanum (Southern Swamp Crinum)
Crinum pedunculatum (mangrove lily)
Crithmum maritimum (rock samphire)
Crocosmia 'Lucifer' (Lucifer Crocosmia)
Crocosmia spp. (crocosmia)
Crocosmia x crocosmiiflora 'Lucifer' (red crocosmia)
Crocus neapolitanus (spring crocus)
Crocus tommasinianus (Tommasini's Crocus)
Croton californicus (California croton)
Croton lindheimeri (Lindheimer's Doveweed)
Croton monanthogynus (Prairie Tea)
Croton setiger (turkey mullein)
Crowea saligna (willow-leaved crowea)
Cruciata laevipes (Crosswort)
Cryphaea heteromalla (Lateral Cryphaea)
Cryptandra amara (Bitter Cryptandra)
Cryptandra tomentosa (prickly cryptandra)
Cryptantha intermedia (Clearwater cryptantha)
Cryptocarya microneura (murrogun)
Cryptocarya triplinervis (Brown Laurel)
Cryptogramma crispa (parsley fern)
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)
Cryptostylis erecta (bonnet orchid)
Cryptostylis leptochila (small tongue-orchid)
Cryptostylis subulata (Large Tongue Orchid)
Cryptotaenia canadensis (honewort)
Ctenidium molluscum (Comb-moss)
Cucumis sativus 'Marketmore 76' (Marketmore 76 Cucumber)
Cucumis sativus 'Straight Eight' (Straight Eight Cucumber)
Cucumis sativus 'Suyo Long' (Suyo Long Cucumber)
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)
Cunninghamia lanceolata (China Fir)
Cunninghamia lanceolata 'Glauca' (Blue China Fir)
Cupaniopsis anacardioides (Tuckeroo)
Cupaniopsis parvifolia (small-leaved tuckeroo)
Cupressus × leylandii (Leyland Cypress)
Cupressus sempervirens (Italian Cypress)
Cupressus sempervirens 'Stricta' (Italian Cypress)
Cuscuta californica (California dodder)
Cuscuta epithymum (Clover Dodder)
Cyanicula caerulea (blue finger-orchid)
Cyanicula sericea (Silky Blue Orchid)
Cyanthillium cinereum (little ironweed)
Cyathea australis (rough tree-fern)
Cyathophorum bulbosum (quill moss)
Cycas circinalis (queen sago)
Cycas revoluta (Sago Palm)
Cyclamen coum (Spring cyclamen)
Cyclamen hederifolium (ivy-leaved cyclamen)
Cyclamen persicum (Florist's Cyclamen)
Cyclophyllum coprosmoides (Coast Canthium)
Cyclospermum leptophyllum (Marsh parsley)
Cycnogeton procerus (Water Ribbons)
Cydonia oblonga (Quince)
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 muralis (Ivy-leaved toadflax)
Cymbidium canaliculatum (Channelled boat-lip orchid)
Cymbidium madidum (Arrowroot Orchid)
Cymbidium suave (Snake Orchid)
Cymbonotus preissianus (Austral bear’s-ears)
Cymbopogon refractus (barbwire grass)
Cynanchica pyrenaica (Squinancywort)
Cynanchum laeve (honey-vine climbing milkweed)
Cynodon dactylon (Bermuda Grass)
Cynoglossum australe (Australian Hound's-tongue)
Cynoglossum officinale (hound's-tongue)
Cynosurus cristatus (crested dogtail grass)
Cyperus eragrostis (tall flatsedge)
Cyperus polystachyos (Bunchy flat-sedge)
Cyperus rotundus (Purple Nutsedge)
Cyperus strigosus (straw-colored flatsedge)
Cypripedium acaule (pink lady's slipper)
Cypripedium parviflorum (yellow lady's slipper)
Cypripedium spp. (lady's slipper)
Cyrtomium caryotideum (Fish-tail Holly Fern)
Cyrtomium falcatum (Japanese Holly Fern)
Cyrtomium fortunei (Fortune's Holly Fern)
Cyrtomium macrophyllum (Large-leaved Holly Fern)
Cyrtostachys renda (Sealing Wax Palm)
Cyrtostylis reniformis (Gnat orchid)
Cyrtostylis robusta (large gnat-orchid)
Cystopteris fragilis (brittle bladderfern)
Cystopteris protrusa (lowland brittle fern)
Cytisus scoparius (Scotch broom)
Daboecia cantabrica (Irish Heath)
Daboecia cantabrica f. alba (White Irish Heath)
Dactylis glomerata (orchard grass)
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 Hybrids (dahlia)
Dahlia merckii (Bedding Dahlia)
Dahlia pinnata (Garden Dahlia)
Dalea purpurea (purple prairie clover)
Dampiera purpurea (Purple Dampiera)
Dampiera stricta (Blue Dampiera)
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 macropodum (Himalayan Daphniphyllum)
Darmera peltata (umbrella plant)
Darwinia fascicularis (clustered darwinia)
Dasiphora fruticosa (potentilla, cinquefoil)
Dasylirion wheeleri (Wheeler sotol)
Datura metel (Devil's Trumpet Plant)
Datura stramonium (jimsonweed)
Datura wrightii (Sacred Datura)
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)
Davidia involucrata (dove tree)
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 superba (giant moss)
Decodon verticillatus (swamp loosestrife)
Deinandra fasciculata (Clustered Tarweed)
Delairea odorata (Cape-ivy)
Delonix regia (Royal Poinciana)
Delosperma sutherlandii (Sutherland's Ice Plant)
Delphinium ajacis (doubtful knight's-spur)
Delphinium carolinianum (Wild Blue Larkspur)
Delphinium Hybrids (delphinium)
Delphinium nudicaule (Red larkspur)
Delphinium spp. (delphinium)
Delphinium tricorne (dwarf larkspur)
Dendrobium kingianum (pink rock orchid)
Dendrobium linguiforme (tongue orchid)
Dendrobium speciosum (rock orchid)
Dendrocnide excelsa (Giant Stinging Tree)
Dendrolycopodium dendroideum (prickly tree-clubmoss)
Dendrolycopodium obscurum (flat-branched tree-clubmoss)
Dendromecon rigida (Bush Poppy)
Dennstaedtia punctilobula (Hay-Scented Fern)
Dermatophyllum secundiflorum (Texas mountain laurel)
Deschampsia cespitosa (tufted hairgrass)
Deschampsia flexuosa (Wavy Hair Grass)
Descurainia pinnata (Western Tansymustard)
Descurainia spp. (tansy mustard)
Desmanthus illinoensis (Illinois bundleflower)
Desmodium canadense (showy tick-trefoil)
Desmodium incanum (creeping beggarweed)
Desmodium paniculatum (panicled ticktrefoil)
Desmodium rhytidophyllum (Rusty tick-trefoil)
Deutzia gracilis (slender deutzia)
Dianella brevicaulis (Coast Flax-Lily)
Dianella longifolia (Pale Flax-Lily)
Dianella revoluta (Blueberry Lily)
Dianthus arenarius (sand pink)
Dianthus armeria (Deptford pink)
Dianthus barbatus (sweet William)
Dianthus carthusianorum (Carthusian Pink)
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)
Dichanthelium clandestinum (deertongue)
Dichelostemma congestum (Ookow)
Dichondra carolinensis (Carolina ponysfoot)
Dichondra repens (kidney weed)
Dicksonia antarctica (man fern)
Dicranella heteromalla (Silky Forklet-moss)
Dicranoweisia cirrata (Common Pincushion)
Dicranum scoparium (Broom Forkmoss)
Dieffenbachia seguine (Dumb Cane)
Dierama pulcherrimum (Angel's Fishing Rod)
Diervilla lonicera (northern bush honeysuckle)
Diervilla rivularis (Bush Honeysuckle)
Diervilla × splendens (Bush Honeysuckle)
Dieteria canescens (Hoary Tansyaster)
Dietes grandiflora (Large Fortnight Lily)
Digitalis ferruginea (Rusty Foxglove)
Digitalis grandiflora (Large Yellow Foxglove)
Digitalis laevigata (Grecian Foxglove)
Digitalis lutea (yellow foxglove)
Digitalis obscura (Sunset Foxglove)
Digitalis parviflora (Small-flowered Foxglove)
Digitalis purpurea (common foxglove)
Digitalis thapsi (Spanish Foxglove)
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)
Diodia virginiana (buttonweed)
Dioscorea bulbifera (air potato)
Dioscorea communis (Black Bryony)
Dioscorea transversa (Common Yam Vine)
Dioscorea villosa (wild yam)
Diospyros geminata (scaly ebony)
Diospyros kaki (Japanese Persimmon)
Diospyros lotus (Date Plum)
Diospyros texana (Texas Persimmon)
Diospyros virginiana (American Persimmon)
Diphasiastrum digitatum (fan clubmoss)
Diphylleia cymosa (Umbrella Leaf)
Diplacus aurantiacus (orange bush monkeyflower)
Diplacus longiflorus (southern bush monkeyflower)
Diplacus puniceus (red bush monkeyflower)
Diplarrena moraea (Australian white iris)
Diploglottis australis (Native Tamarind)
Diplophyllum albicans (White Earwort)
Diplotaxis muralis (annual wall-rocket)
Diplotaxis tenuifolia (Perennial Wall-rocket)
Dipodium punctatum (Blotched Hyacinth-Orchid)
Dipodium roseum (Rosy Hyacinth Orchid)
Dipodium variegatum (Slender Hyacinth-Orchid)
Dipogon lignosus (Okie bean)
Dipsacus fullonum (common teasel)
Dipsacus laciniatus (cutleaf teasel)
Dipsacus pilosus (small teasel)
Dipterostemon capitatus (blue dicks)
Disa bracteata (Bract Disa)
Disanthus cercidifolius (Disanthus)
Disphyma crassifolium (Purple Dewplant)
Disporum uniflorum (Yellow Fairybells)
Distichlis distichophylla (Australian Salt-grass)
Distichlis spicata (Saltgrass)
Distimake dissectus (Alamo vine)
Dittrichia graveolens (Stinkwort)
Diuris chryseopsis (Common Golden Moths)
Diuris orientis (Wallflower orchid)
Diuris pardina (Leopard Orchid)
Diuris sulphurea (Tiger Orchid)
Dodonaea triquetra (Common Hop Bush)
Dodonaea viscosa (Akeake)
Doellingeria umbellata (flat-top white aster)
Dolichandra unguis-cati (Catclaw vine)
Doodia aspera (Prickly Rasp fern)
Doodia caudata (Small Rasp Fern)
Doronicum pardalianches (Leopard's-bane)
Doryanthes excelsa (Gymea Lily)
Draba aizoides (Yellow Whitlow Grass)
Draba verna (Common Whitlowgrass)
Dracaena masoniana (Whale Fin Snake Plant)
Dracaena zeylanica (Ceylon Bowstring Hemp)
Dracocephalum grandiflorum (Large-flowered Dragonhead)
Dracophyllum secundum (necklace heath)
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)
Drynaria rigidula (basket fern)
Dryopteris affinis (Golden-scaled Male-fern)
Dryopteris arguta (coastal woodfern)
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 wallichiana (Wallich's Wood Fern)
Drypetes deplanchei (Yellow Tulipwood)
Duboisia myoporoides (corkwood)
Dudleya cymosa (Canyon liveforever)
Dudleya farinosa (Bluff Lettuce)
Dudleya lanceolata (lanceleaf liveforever)
Dudleya pulverulenta (Chalk Dudleya)
Duma florulenta (Tangled Lignum)
Duranta erecta (Golden Dewdrop)
Dypsis lutescens (Areca Palm)
Dyschoriste nagchana
Dysphania ambrosioides (Mexican tea)
Echeveria elegans (Mexican Gem)
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 'White Swan' (White Swan Coneflower)
Echinacea simulata (Wavy-Leaved Purple Coneflower)
Echinochloa crus-galli (barnyardgrass)
Echinocystis lobata (prickly cucumber)
Echinops bannaticus (Blue Globe Thistle)
Echinops exaltatus (Russian Globe Thistle)
Echinops sphaerocephalus (Great Globe Thistle)
Echium candicans (Pride of Madeira)
Echium pininana (Giant Viper's-bugloss)
Echium plantagineum (purple viper's-bugloss)
Echium vulgare (blueweed)
Eclipta prostrata (False Daisy)
Edgeworthia chrysantha (edgeworthia, paperbush)
Edraianthus graminifolius (Grassy Bells)
Egeria densa (Brazilian egeria)
Ehretia anacua (Anacua)
Ehrharta erecta (panic veldtgrass)
Ehrharta longiflora (longflower veldtgrass)
Elaeagnus pungens (silverberry)
Elaeagnus pungens 'Maculata' (Golden Variegated Elaeagnus)
Elaeagnus umbellata (autumn olive)
Elaeocarpus grandis (blue quandong)
Elaeocarpus obovatus (Hard Quandong)
Elaeocarpus reticulatus (Blueberry ash)
Elaeodendron australe (Red-fruited Olive Plum)
Elephantopus carolinianus (leafy elephant's-foot)
Elephantopus tomentosus (common elephant's-foot)
Eleusine indica (Goose Grass)
Elliottia pyroliflora (copperbush)
Elymus athericus (sea couch)
Elymus canadensis (Canada wild rye)
Elymus elymoides (Squirreltail)
Elymus glaucus (blue wildrye)
Elymus hystrix (Bottlebrush Grass)
Elymus virginicus (Virginia wildrye)
Elythranthera brunonis (purple enamel orchid)
Embelia australiana (Embelia)
Embothrium coccineum (Chilean fire tree)
Emilia fosbergii (Red Tasselflower)
Emilia sonchifolia (lilac tasselflower)
Emmenanthe penduliflora (whispering bells)
Empetrum nigrum (black crowberry)
Encelia californica (California brittlebush)
Encelia farinosa (Brittlebush)
Enchylaena tomentosa (Barrier Saltbush)
Enemion biternatum (false rue anemone)
Engelmannia peristenia (Engelmann daisy)
Enkianthus campanulatus (enkianthus)
Enkianthus perulatus (White Enkianthus)
Enkianthus serrulatus (white bell enkianthus)
Ensete ventricosum (Ethiopian Banana)
Entodon seductrix (seductive entodon moss)
Entolasia stricta (Wiry Panic)
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 viridis (Green Ephedra)
Epidendrum ibaguense (Reed Orchid)
Epifagus virginiana (Beechdrops)
Epigaea repens (trailing arbutus)
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 acuminatum (Pointed-leaved Barrenwort)
Epimedium davidii (David's Barrenwort)
Epimedium ssp. (barrenwort)
Epimedium x rubrum
Epipactis helleborine (Broad-leaved helleborine)
Epipactis palustris (Marsh Helleborine)
Epipremnum aureum (Golden Pothos)
Epipremnum pinnatum (Dragon Tail Plant)
Equisetum arvense (common horsetail (native))
Equisetum fluviatile (water horsetail)
Equisetum hyemale (scouring rush)
Equisetum palustre (marsh horsetail)
Equisetum sylvaticum (wood horsetail)
Equisetum telmateia (great horsetail)
Eragrostis curvula (African love grass)
Eragrostis spectabilis (Purple Lovegrass)
Eranthis hyemalis (Winter Aconite)
Erechtites hieraciifolius (American burnweed)
Eremochloa ophiuroides (Centipede Grass)
Eremophila debilis (Winter Apple)
Eremophila glabra (Common Emu-Bush)
Eremophila longifolia (Weeping Emubush)
Erica lusitanica (Portuguese Heath)
Ericameria linearifolia (narrowleaf goldenbush)
Ericameria nauseosa (Rubber Rabbitbrush)
Erica spp. (heath)
Erica tetralix (Cross-leaved Heath)
Erigenia bulbosa (harbinger of spring)
Erigeron acris (bitter fleabane)
Erigeron annuus (annual fleabane)
Erigeron bonariensis (Flax-leaved Horseweed)
Erigeron canadensis (horseweed)
Erigeron divergens (spreading fleabane)
Erigeron floribundus (Tall Fleabane)
Erigeron glacialis (Subalpine Fleabane)
Erigeron karvinskianus (Mexican Fleabane)
Erigeron karvinskianus spp. (Mexican fleabane)
Erigeron modestus (Plains fleabane)
Erigeron pulchellus (robin's-plantain)
Erigeron quercifolius (oakleaf fleabane)
Erigeron strigosus (daisy fleabane)
Erigeron sumatrensis (tropical horseweed)
Erinus alpinus (Fairy Foxglove)
Eriobotrya japonica (Loquat)
Eriocapitella hupehensis (Hubei Anemone)
Eriochilus cucullatus (Parson's Bands)
Eriocoma hymenoides (Sand Ricegrass)
Eriodictyon californicum (California yerba santa)
Eriodictyon crassifolium (Thick-leaved Yerba Santa)
Eriogonum fasciculatum (California Buckwheat)
Eriogonum inflatum (Desert Trumpet)
Eriogonum latifolium (Seaside Buckwheat)
Eriogonum nudum (Naked Buckwheat)
Eriogonum ovalifolium (cushion buckwheat)
Eriogonum parvifolium (Seacliff Wild Buckwheat)
Eriogonum wrightii (Wright's buckwheat)
Eriophorum angustifolium (Common Cottongrass)
Eriophorum vaginatum (tussock cottongrass)
Eriophyllum confertiflorum (Golden Yarrow)
Eriophyllum staechadifolium (seaside woolly sunflower)
Eriostemon australasius (pink wax flower)
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 sativa (Arugula)
Eryngium agavifolium (Agave-leaved Sea Holly)
Eryngium alpinum (Alpine Sea Holly)
Eryngium amethystinum (Amethyst Sea Holly)
Eryngium Hybrids (sea holly)
Eryngium leavenworthii (Leavenworth's eryngo)
Eryngium maritimum (Sea Holly)
Eryngium ovinum (blue devil)
Eryngium planum (Blue Eryngo)
Erysimum (wallflower)
Erysimum capitatum (Western Wallflower)
Erythranthe guttata (yellow monkey-flower)
Erythrina crista-galli (Cockspur coral tree)
Erythrina herbacea (Eastern Coral Bean)
Erythronium albidum (white fawnlily)
Erythronium americanum (Yellow Trout 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 californica (California poppy)
Escobaria vivipara (Spinystar)
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 diversifolia (Coastal Mallee)
Eucalyptus fasciculosa (Pink Gum)
Eucalyptus grandis (Flooded Gum)
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 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 glutinosa (Brush Bush)
Eulobus californicus (California primrose)
Eulophia picta (Shepherd's Crook Orchid)
Euonymus alatus (Burning Bush)
Euonymus alatus 'Compactus' (dwarf winged euonymus)
Euonymus americanus (strawberry bush)
Euonymus europaeus (Spindle)
Euonymus fortunei (wintercreeper)
Euonymus fortunei 'Emerald Gaiety' (Emerald Gaiety Euonymus)
Euonymus japonicus (Japanese Euonymus)
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 albomarginata (Whitemargin Sandmat)
Euphorbia amygdaloides (wood spurge)
Euphorbia bicolor (snow-on-the-prairie)
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 nutans (nodding spurge)
Euphorbia oblongata (eggleaf spurge)
Euphorbia paralias (Sea Spurge)
Euphorbia peplus (petty spurge)
Euphorbia polycarpa (smallseed sandmat)
Euphorbia portlandica (Portland Spurge)
Euphorbia prostrata (prostrate sandmat)
Euphorbia pulcherrima (Poinsettia)
Euphorbia serpens (creeping spurge)
Euphorbia virgata (leafy spurge)
Euphorbia x pasteurii
Euphrasia collina (purple eyebright)
Euphrasia nemorosa (Common Eyebright)
Eupomatia laurina (Bolwarra)
Eurhynchium striatum (Common Striated Feather-moss)
Euroschinus falcatus (Blush Cudgerie)
Eurybia divaricata (white wood aster)
Eurybia divaricata (White Wood Aster)
Eurybia macrophylla (large-leaved aster)
Euryomyrtus ramosissima (Rosy Heath-myrtle)
Eustrephus latifolius (Wombat Berry)
Eutaxia microphylla (common eutaxia)
Euthamia caroliniana (slender goldentop)
Euthamia graminifolia (flat-topped goldenrod)
Eutrochium fistulosum (tall Joe-pye weed)
Eutrochium purpureum (sweet Joe-Pye-weed)
Evolvulus alsinoides (tropical speedwell)
Excoecaria agallocha (milky mangrove)
Exocarpos cupressiformis (Cherry Ballart)
Exocarpos latifolius (Broad Leaved Native Cherry)
Exocarpos strictus (Pale-fruit Ballart)
Eysenhardtia texana (Texas Kidneywood)
Fabiana imbricata (Pichi)
Fagopyrum esculentum (Common Buckwheat)
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 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 paradoxa (Apache plume)
Fargesia robusta (Robust Bamboo)
Fatoua villosa (hairy crabweed)
× Fatshedera lizei (fatshedera)
Fatsia japonica (fatsia)
Ferocactus cylindraceus (California Barrel Cactus)
Ferocactus wislizeni (fishhook barrel cactus)
Ferula communis (giant fennel)
Festuca arundinacea (Tall Fescue)
Festuca brevipila (Hard Fescue)
Festuca glauca (blue fescue)
Festuca idahoensis (Idaho fescue)
Festuca rubra (Red Fescue)
Ficaria verna (lesser celandine)
Ficinia nodosa (Knobby Clubrush)
Ficus altissima (Council Tree)
Ficus aurea (Florida Strangler Fig)
Ficus benghalensis (Ficus Audrey)
Ficus carica (common fig)
Ficus coronata (creek sandpaper fig)
Ficus lyrata (fiddle leaf fig)
Ficus macrophylla (Moreton Bay fig)
Ficus microcarpa (Ficus Ginseng)
Ficus opposita (Sandpaper Fig)
Ficus rubiginosa (Port Jackson fig)
Ficus virens (White fig)
Filago germanica (Common Cudweed)
Filipendula ulmaria (Meadowsweet)
Filipendula vulgaris (Dropwort)
Fimbristylis dichotoma (Common Fringe-rush)
Fissidens taxifolius (Common Pocket-moss)
Flagellaria indica (Indian Bushcane)
Flindersia australis (Crows Ash)
Foeniculum vulgare (Fennel)
Forestiera pubescens (Downy Forestiera)
Forsythia suspensa (Golden-bell)
Forsythia x intermedia (hybrid forsythia)
Fothergilla gardenii (dwarf fothergilla)
Fouquieria splendens (ocotillo)
Fragaria 'Lipstick' (lipstick strawberry)
Francoa sonchifolia (Chilean bridalwreath)
Frangula alnus (alder buckthorn)
Frangula californica (coffeeberry)
Frangula caroliniana (Carolina buckthorn)
Frangula purshiana (cascara)
Frankenia salina (Alkali Heath)
Franklinia alatamaha (franklinia)
Frasera speciosa (monument plant)
Fraxinus albicans (Texas ash)
Fraxinus americana (White Ash)
Fraxinus angustifolia (Narrow-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 leichtlinii (Dune Kammetjie)
Fremontodendron californicum (California flannelbush)
Fritillaria imperialis (crown imperial)
Fritillaria meleagris (snakes-head fritillary)
Fritillaria pudica (yellow fritillary)
Frullania dilatata (Dilated Scalewort)
Frullania eboracensis (New York Scalewort)
Frullania tamarisci (Tamarisk Scalewort)
Fuchsia magellanica (hardy fuchsia)
Fuchsia x hybrida (Fuchsia)
Fumaria capreolata (white ramping-fumitory)
Fumaria muralis (common ramping-fumitory)
Fumaria officinalis (Common Fumitory)
Funaria hygrometrica (Bonfire moss)
Gahnia aspera (Red-berried Saw-sedge)
Gahnia clarkei (tall saw-sedge)
Gahnia radula (Thatch Saw-sedge)
Gahnia sieberiana (Red-fruit Saw-sedge)
Gaillardia aristata (blanketflower)
Gaillardia pulchella (firewheel)
Galanthus elwesii (Giant Snowdrop)
Galanthus ikariae (Ikarian Snowdrop)
Galanthus nivalis (Common Snowdrop)
Galax urceolata (galax)
Galearis spectabilis (showy orchis)
Galega officinalis (common milkpea)
Galeopsis bifida (Bifid Hemp-nettle)
Galeopsis tetrahit (Common hemp-nettle)
Galinsoga quadriradiata (shaggy soldier)
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 pensylvanica (Pennsylvania Cudweed)
Gardenia jasminoides (Gardenia)
Garrya elliptica (coast silktassel)
Gastrodia sesamoides (Cinnamon Bells)
Gaudium laevigatum (Coast Teatree)
Gaudium myrsinoides (Heath Teatree)
Gaudium trinervium (Paperbark Tea Tree)
Gaultheria mucronata (Chilean pernettya)
Gaultheria procumbens (wintergreen)
Gaultheria shallon (salal)
Gaura (Wand Flower)
Gaylussacia baccata (black huckleberry)
Geijera parviflora (Wilga)
Geijera salicifolia (Axe Gapper)
Geitonoplesium cymosum (Climbing Lily)
Gelsemium sempervirens (Carolina Jessamine)
Genista linifolia (needle-leaved broom)
Genista lydia (Lydia broom)
Genista monspessulana (French broom)
Genista pilosa (silkyleaf woadwaxen)
Genista tinctoria (Dyer's Greenweed)
Gentiana asclepiadea (Willow Gentian)
Gentianella amarella (autumn gentian)
Geraea canescens (Desert Sunflower)
Geranium caespitosum (pinewoods geranium)
Geranium cantabrigiense (Cambridge Geranium)
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 molle (dovefoot geranium)
Geranium 'Patricia' (Patricia Geranium)
Geranium phaeum 'Samobor' (Samobor Geranium)
Geranium potentilloides (cinquefoil geranium)
Geranium pratense (Meadow Crane's-bill)
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 sanguineum (Bloody Crane's-bill)
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)
Geum canadense (white avens)
Geum macrophyllum (large-leaved avens)
Geum rivale (Water Avens)
Geum ssp. 'Cocktail Collection' (avens)
Geum urbanum (Wood Avens)
Gilia capitata (bluehead gilia)
Gilia tricolor (bird's-eye gilia)
Ginkgo biloba (ginkgo, maidenhair tree)
Ginkgo biloba 'Autumn Gold' (Autumn Gold Ginkgo)
Ginkgo biloba 'PNI 2720' (ginkgo)
Gladiolus communis (Gladiolus)
Gladiolus Hybrids (hardy gladiolus)
Gladiolus murielae (fragrant gladiolus)
Glandora diffusa (lithodora)
Glandularia aristigera (South American mock vervain)
Glandularia bipinnatifida (Dakota mock vervain)
Glandularia canadensis (rose vervain)
Glaucium flavum (Yellow Horned Poppy)
Glebionis coronaria (Garland Daisy)
Glebionis segetum (Corn Marigold)
Glechoma hederacea (ground-ivy)
Gleditsia triacanthos (honey locust)
Gleichenia dicarpa (Pouched Coral Fern)
Gleichenia microphylla (scrambling coral-fern)
Glischrocaryon behrii (golden pennants)
Glochidion ferdinandi (Cheese Tree)
Glossodia major (Waxlip Orchid)
Glossodia minor (Small Waxlip Orchid)
Glyceria borealis (northern mannagrass)
Glyceria elata (tall mannagrass)
Glyceria fluitans (water manna grass)
Glyceria maxima (reed meadowgrass)
Glycine clandestina (Twining Glycine)
Glycine tabacina (Glycine Pea)
Glycyrrhiza lepidota (Wild Licorice)
Gnaphalium uliginosum (marsh cudweed)
Goeppertia insignis (Rattlesnake Plant)
Goeppertia makoyana (Peacock Plant)
Goeppertia orbifolia (Round-Leaved Calathea)
Goeppertia ornata (Pinstripe Calathea)
Gomphocarpus fruticosus (Narrow-leaf Cotton Bush)
Gomphocarpus physocarpus (balloonplant)
Gompholobium grandiflorum (Large Wedge Pea)
Gompholobium huegelii (Common Wedge-pea)
Gompholobium latifolium (Golden Glory Pea)
Gomphrena celosioides (prostrate globe-amaranth)
Gomphrena globosa (Globe Amaranth)
Gonocarpus micranthus (creeping raspwort)
Gonocarpus tetragynus (Common Raspwort)
Gonocarpus teucrioides (Raspwort)
Gonolobus suberosus (Anglepod)
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 lotifolia (Clover-leaved Poison)
Goodyera pubescens (downy rattlesnake plantain)
Gossia bidwillii (Python Tree)
Gratiola peruviana (Austral Brooklime)
Grevillea alpina (Mountain Grevillea)
Grevillea aquifolium (variable prickly grevillea)
Grevillea banksii (Scarlet Grevillea)
Grevillea buxifolia (Grey Spider Flower)
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)
Grimmia laevigata (Grimmia Dry Rock Moss)
Grimmia pulvinata (Grey-cushioned Grimmia)
Grindelia squarrosa (Curlycup Gumweed)
Grindelia stricta (Oregon Gumplant)
Guioa semiglauca (Guioa)
Gunnera manicata (gunnera)
Gutierrezia sarothrae (Broom Snakeweed)
Guzmania lingulata (Scarlet Star)
Gymnadenia conopsea (Fragrant Orchid)
Gymnocalycium mihanovichii (Moon Cactus)
Gymnocarpium disjunctum (oak fern)
Gymnocladus dioicus (Kentucky coffee tree)
Gymnostachys anceps (settler's flax)
Gynatrix pulchella (Hemp Bush)
Gynochthodes jasminoides (sweet morinda)
Hackelia latifolia (Forest Hound’s-tongue)
Hackelia suaveolens (sweet hound's-tongue)
Hackelia virginiana (virginia stickseed)
Hacquetia epipactis (hacqetia)
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 macra (Hakone grass)
Hakonechloa macra 'All Gold' (All Gold Hakone Grass)
Hakonechloa macra 'Aureola' (Japanese Forest Grass)
Halesia carolina (Carolina silverbell)
Hamamelis mollis (Chinese witch hazel)
Hamamelis x intermedia (hybrid witch hazel)
Hamelia patens (Firebush)
Handroanthus chrysotrichus (Golden Trumpet Tree)
Handroanthus impetiginosus (Pink Trumpet Tree)
Hardenbergia comptoniana (Native wisteria)
Hardenbergia violacea (False Sarsaparilla)
Harpullia pendula (Black Tulip)
Hazardia squarrosa (saw-toothed goldenbush)
Hedera helix (English Ivy)
Hedera hibernica (Atlantic or Irish ivy)
Hedwigia ciliata (Ciliate Hoarmoss)
Hedycarya angustifolia (Australian mulberry)
Hedychium gardnerianum (Kahili ginger)
Hedypnois rhagadioloides (Cretanweed)
Helenium amarum (Bitterweed)
Helenium autumnale (Sneezeweed)
Helenium 'Moerheim Beauty' (Moerheim Beauty Sneezeweed)
Helenium spp. (sneezeweed)
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 petiolaris (prairie sunflower)
Helianthus tuberosus (Jerusalem artichoke)
Helichrysum leucopsideum (Satin Everlasting)
Heliconia rostrata (Hanging Lobster Claw)
Helictotrichon sempervirens (blue oat grass)
Heliomeris multiflora (showy goldeneye)
Heliotropium amplexicaule (fragrant heliotrope)
Heliotropium curassavicum (alkali heliotrope)
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 echioides (bristly oxtongue)
Helosciadium nodiflorum (Fool's Watercress)
Hemerocallis 'Buttered Popcorn' (Buttered Popcorn Daylily)
Hemerocallis 'Canadian Border Patrol' (Canadian Border Patrol Daylily)
Hemerocallis 'Custard Candy' (Custard Candy Daylily)
Hemerocallis 'Ed Brown' (Ed Brown Daylily)
Hemerocallis 'Ed Murray' (Ed Murray Daylily)
Hemerocallis 'El Desperado' (El Desperado Daylily)
Hemerocallis 'Fooled Me' (Fooled Me Daylily)
Hemerocallis Hybrids (daylily)
Hemerocallis 'Janice Brown' (Janice Brown Daylily)
Hemerocallis 'Moonlit Masquerade' (Moonlit Masquerade Daylily)
Hemerocallis 'Primal Scream' (Primal Scream Daylily)
Hemerocallis 'Siloam Double Classic' (Siloam Double Classic)
Hemerocallis 'Strawberry Candy' (Strawberry Candy Daylily)
Hepatica acutiloba (sharp-lobed hepatica)
Hepatica americana (round-lobed hepatica)
Heptapleurum actinophyllum (Australian Umbrella Tree)
Heptapleurum arboricola (Miniature umbrella tree)
Heracleum mantegazzianum (giant hogweed)
Heracleum maximum (cow-parsnip)
Heracleum sphondylium (hogweed)
Herbertia lahue (Prairie Nymph)
Hesperaloe parviflora (Red Yucca)
Hesperis matronalis (dame's rocket)
Hesperocallis undulata (desert lily)
Hesperocyparis arizonica (Arizona Cypress)
×Hesperocyparis leylandii (Leyland cypress)
Hesperocyparis macrocarpa 'Goldcrest' (Goldcrest Monterey Cypress)
Hesperoyucca whipplei (chaparral yucca)
Heteromeles arbutifolia (Toyon)
Heterotheca grandiflora (Telegraphweed)
Heterotheca subaxillaris (Camphorweed)
Heuchera americana (American Alumroot)
Heuchera micrantha (native heuchera)
Heuchera micrantha (small-flowered alumroot)
Heuchera spp. (coral bells)
× Heucherella 'Kimono' (Kimono Foamy Bells)
Hexasepalum teres (rough buttonweed)
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 coccineus (Scarlet Rose Mallow)
Hibiscus heterophyllus (Rosella)
Hibiscus laevis (Halberd-leaf Rosemallow)
Hibiscus moscheutos (Hardy Hibiscus)
Hibiscus rosa-sinensis (Tropical Hibiscus)
Hibiscus syriacus (Rose of Sharon)
Hibiscus syriacus 'Diana' (Diana Rose of Sharon)
Hibiscus tiliaceus (sea hibiscus)
Hibiscus trionum (flower-of-an-hour)
Hieracium aurantiacum (orange hawkweed)
Hieracium umbellatum (Canada hawkweed)
Hieracium venosum (rattlesnakeweed)
Hippocrepis comosa (horseshoe vetch)
Hippophae rhamnoides (Sea-buckthorn)
Hippuris vulgaris (Common Mare's Tail)
Hirschfeldia incana (Shortpod Mustard)
Histiopteris incisa (Water Fern)
Holcus lanatus (common velvet-grass)
Holcus mollis (creeping velvet grass)
Holodiscus discolor (ocean spray)
Homalanthus populifolius (Bleeding Heart)
Homalothecium sericeum (Silky Wall Feather-moss)
Honckenya peploides (Sea Sandwort)
Hookeria lucens (Shining Hookeria)
Hordeum jubatum (foxtail barley)
Hordeum murinum (wall barley)
Hordeum pusillum (little barley)
Hordeum vulgare (Common Barley)
Hosta Hybrids (hosta)
Hosta 'June' (June Hosta)
Hosta 'Sum and Substance' (Sum and Substance Hosta)
Hottonia palustris (Water Violet)
Houstonia caerulea (azure bluet)
Houstonia longifolia (long-leaved bluets)
Houstonia purpurea (summer bluet)
Houstonia pusilla (tiny bluet)
Hovea acutifolia (Purple Bush Pea)
Hovea heterophylla (common hovea)
Hoya australis (common waxflower)
Hoya kerrii (Sweetheart Hoya)
Hoya pubicalyx (Wax Plant)
Humulus lupulus 'Aureus' (Golden Hop)
Humulus scandens (Japanese Hops)
Huperzia lucidula (shining firmoss)
Huperzia selago (northern firmoss)
Hyacinthoides hispanica (Spanish bluebells)
Hyacinthoides non-scripta (bluebell)
Hyacinthus orientalis (hyacinth)
Hydrangea anomala ssp. petiolaris (climbing hydrangea)
Hydrangea arborescens 'Annabelle' (Annabelle Hydrangea)
Hydrangea integrifolia (evergreen climbing hydrangea)
Hydrangea macrophylla (bigleaf hydrangea)
Hydrangea macrophylla 'Ayesha' (Ayesha Hydrangea)
Hydrangea macrophylla 'Blaumeise' (Blue Tit 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 'Limelight' (Limelight Peegee Hydrangea)
Hydrangea paniculata 'Tardiva' (Tardiva Hydrangea)
Hydrangea petiolaris (climbing hydrangea)
Hydrangea quercifolia (oak-leaf 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)
Hydrilla verticillata (hydrilla)
Hydrocharis morsus-ranae (European Frog-bit)
Hydrocotyle bonariensis (largeleaf pennywort)
Hydrocotyle hirta (Hairy Pennywort)
Hydrocotyle laxiflora (Stinking Pennywort)
Hydrocotyle ranunculoides (floating marsh pennywort)
Hydrocotyle vulgaris (Marsh Pennywort)
Hydrophyllum appendiculatum (great waterleaf)
Hydrophyllum canadense (Broad-leaf Waterleaf)
Hydrophyllum tenuipes (Pacific waterleaf)
Hydrophyllum virginianum (Virginia waterleaf)
Hylocereus undatus (Dragon Fruit)
Hylocomiadelphus triquetrus (rough goose neck moss)
Hylocomium splendens (stairstep moss)
Hylodesmum glutinosum (pointed-leaved tick-trefoil)
Hylodesmum nudiflorum (naked-flowered tick-trefoil)
Hylotelephium telephium (Orpine)
Hymenopappus scabiosaeus (Carolina Woollywhite)
Hymenophyllum cupressiforme (Common Filmy-fern)
Hymenosporum flavum (Australian frangipani)
Hyophorbe lagenicaulis (Bottle Palm)
Hypericum androsaemum (Tutsan)
Hypericum calycinum (St. John's wort)
Hypericum elodes (Marsh St John's-wort)
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 tetrapetalum (fourpetal St. Johnswort)
Hypericum tetrapterum (Square Stemmed Saint John's Wort)
Hypnum andoi (mamillate plait-moss)
Hypnum cupressiforme (Cypress-leaved Plait-moss)
Hypnum jutlandicum (Heath Plait-moss)
Hypocalymma angustifolium (White Myrtle)
Hypochaeris glabra (Smooth Cat's Ear)
Hypochaeris radicata (hairy cat's-ear)
Hypoestes phyllostachya (Polka Dot Plant)
Hypolaena fastigiata (Tassel Rope-rush)
Hypolepis muelleri (Harsh Ground-fern)
Hypoxis hirsuta (yellow star grass)
Hypoxis hygrometrica (Golden Weather-grass)
Hysterobaeckea behrii (Broom Baeckea)
Iberis saxatilis (rock candytuft)
Iberis sempervirens (candytuft)
Iberis spathulata (Pyrenean Candytuft)
Ilex aquifolium (English holly)
Ilex aquifolium 'Ferox Argentea' (variegated porcupine holly)
Ilex cassine (dahoon holly)
Ilex cornuta (Chinese holly)
Ilex crenata (Japanese holly)
Ilex decidua (possumhaw)
Ilex glabra (gallberry)
Ilex meserveae (Meserve Holly)
Ilex verticillata (common winterberry)
Ilex x meserveae (blue-leaved hybrid holly)
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)
Indigofera australis (Australian Indigo)
Indigofera miniata (Scarlet Pea)
Inga edulis (Ice Cream Bean)
Ipheion uniflorum 'Wisley Blue' (Wisley Blue Spring Starflower)
Ipomoea cairica (Mile-a-minute vine)
Ipomoea cordatotriloba (Tievine)
Ipomoea hederacea (ivy-leaved morning-glory)
Ipomoea indica (oceanblue morning glory)
Ipomoea lacunosa (White Morning-glory)
Ipomoea pandurata (wild potato vine)
Ipomoea pes-caprae (Beach Morning Glory)
Ipomoea purpurea (common morning-glory)
Ipomopsis aggregata (Scarlet Gilia)
Ipomopsis rubra (standing cypress)
Iris florentina (Florentine iris)
Iris pallida 'Variegata' (Variegated Sweet Iris)
Iris paradoxa (paradoxical iris)
Iris pseudacorus (Yellow Iris)
Iris versicolor (northern blue flag)
Iris virginica (Virginia Iris)
Isocoma menziesii (Coastal Goldenbush)
Isopogon anemonifolius (Broad-leaved Drumsticks)
Isopogon anethifolius (Narrow-leaf Drumsticks)
Isopogon ceratophyllus (Horny Cone-bush)
Itea virginica (Virginia sweetspire)
Iva annua (Sumpweed)
Iva frutescens (marsh elder)
Ixodia achillaeoides (sand ixodia)
Ixora coccinea (Jungle flame)
Jacaranda mimosifolia (Jacaranda)
Jacksonia scoparia (winged broom-pea)
Jacobaea aquatica (Marsh Ragwort)
Jacobaea erucifolia (Hoary Ragwort)
Jacobaea maritima (dusty miller)
Jacobaea vulgaris (tansy ragwort)
Jagera pseudorhus (Fern Top)
Jasione montana (Sheep's Bit Scabious)
Jasminum nudiflorum (winter jasmine)
Jasminum polyanthum (Pink Jasmine)
Jasminum stephanense (Pink Jasmine)
Jeffersonia diphylla (twinleaf)
Johnstonella angustifolia (narrow-leaved cryptantha)
Juglans californica (California Black Walnut)
Juglans cinerea (Butternut)
Juglans nigra (black walnut)
Juglans regia (English walnut)
Juncus acutiflorus (Sharp-flowered Rush)
Juncus articulatus (jointed 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 squarrosus (heath rush)
Juncus tenuis (Path Rush)
Juncus usitatus (australian rush)
Juniperus ashei (Ashe juniper)
Juniperus californica (California Juniper)
Juniperus chinensis 'Kaizuka' (Hollywood Juniper)
Juniperus communis (common 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 horizontalis (creeping 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)
Justicia americana (American water-willow)
Justicia californica (chuparosa)
Justicia fulvicoma (Orange Shrimp Plant)
Justicia pilosella (Gregg's tube tongue)
Kalanchoe blossfeldiana (Flaming Katy)
Kalanchoe delagoensis (Mother of Millions)
Kalmia angustifolia (sheep laurel)
Kalmia latifolia (mountain laurel)
Kalmia latifolia 'Elf' (Elf Mountain Laurel)
Kalmia latifolia 'Sarah' (Sarah Mountain Laurel)
Keckiella cordifolia (heartleaf keckiella)
Kennedia prostrata (Running Postman)
Kennedia rubicunda (Dusky coral pea)
Kerria japonica (Japanese kerria)
Kerria japonica 'Picta' (Variegated Japanese Kerria)
Kerria japonica 'Pleniflora' (double kerria)
Kindbergia oregana (Oregon Beaked Moss)
Kindbergia praelonga (Common Feather-moss)
Kingia australis (bullanock)
Kirengeshoma palmata (yellow waxbells)
Knautia arvensis (Field Scabious)
Knautia macedonica (Macedonian Scabious)
Kniphofia Hybrids (torch lily, red hot poker)
Koelreuteria paniculata (goldenrain tree)
Koenigia campanulata (Lesser Knotweed)
Kosteletzkya pentacarpos (Saltmarsh mallow)
Krameria bicolor (White Rhatany)
Krameria lanceolata (Trailing Rhatany)
Krascheninnikovia lanata (Winterfat)
Krigia biflora (Two-flower Dwarf-dandelion)
Krigia virginica (Virginia dwarfdandelion)
Kummerowia striata (Japanese Clover)
Kunzea ambigua (Butterfly Bush)
Kunzea capitata (Pink Kunzea)
Kunzea leptospermoides (Yarra burgan)
Kunzea pomifera (Muntries)
Laburnum anagyroides (golden chain tree)
Laburnum x watereri (Goldenchain Tree)
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 '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 stipitata (Blue Bottle-daisy)
Lagenophora sublyrata (slender bottle-daisy)
Lagerstroemia indica 'Zuni' (Zuni Crape Myrtle)
Lagerstroemia spp. (crape myrtle)
Lagunaria patersonia (Norfolk Island hibiscus)
Lagurus ovatus (Hare's Tail Grass)
Lambertia formosa (Mountain Devil)
Lamiastrum galeobdolon (yellow archangel)
Lamium album (White deadnettle)
Lamium amplexicaule (henbit deadnettle)
Lamium galeobdolon (yellow archangel)
Lamium hybridum (cutleaf deadnettle)
Lamium maculatum (deadnettle)
Lamium purpureum (red deadnettle)
Lamprocapnos spectabilis (bleeding heart)
Lantana montevidensis (creeping lantana)
Lantana strigocamara (Lantana)
Lantana urticoides (Texas lantana)
Laportea canadensis (wood nettle)
Lapsana communis (nipplewort)
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 spp. (larch)
Larrea tridentata (Creosote Bush)
Lasiopetalum ferrugineum (Rusty Petals)
Lasthenia californica (California goldfields)
Lathraea clandestina (Purple Toothwort)
Lathraea squamaria (Common Toothwort)
Lathyrus japonicus (seaside pea)
Lathyrus latifolius (broad-leaved sweet pea)
Lathyrus linifolius (Bitter Vetch)
Lathyrus nissolia (Grass Vetchling)
Lathyrus pratensis (meadow pea)
Lathyrus vestitus (Pacific pea)
Laurus nobilis (bay laurel)
Lavandula angustifolia (English lavender)
Lavandula × intermedia (Lavandin)
Lavandula stoechas (Spanish lavender)
Laxmannia gracilis (Slender Wire Lily)
Layia platyglossa (tidy tips)
Leichhardtia rostrata (Common Milk Vine)
Lemna minor (Common Duckweed)
Leontodon hispidus (Rough Hawkbit)
Leontodon saxatilis (Hairy Hawkbit)
Leonurus cardiaca (common motherwort)
Lepechinia calycina (California Pitcher Sage)
Lepidium campestre (field peppergrass)
Lepidium didymum (Lesser swine-cress)
Lepidium draba (Heart-podded Hoary Cress)
Lepidium latifolium (perennial pepperweed)
Lepidium virginicum (Virginia pepperweed)
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 fimbriata (Hare Orchid)
Leptecophylla parvifolia (Mountain Pinkberry)
Leptoceras menziesii (Rabbit Orchid)
Leptorhynchos squamatus (Scaly-buttons)
Leptorhynchos tenuifolius (Wiry Buttons)
Leptospermum continentale (prickly tea-tree)
Leptospermum lanigerum (Woolly Teatree)
Leptospermum polygalifolium (Tantoon)
Leptospermum scoparium (Mānuka)
Leptospermum squarrosum (Peach-flowered Tea Tree)
Leschenaultia biloba (Blue Leschenaultia)
Lespedeza capitata (round-headed bush clover)
Lespedeza cuneata (Chinese bushclover)
Lespedeza virginica (slender bush clover)
Leucaena leucocephala (White leadtree)
Leucanthemum maximum (max chrysanthemum)
Leucanthemum vulgare (Oxeye Daisy)
Leucanthemum x superbum (Shasta daisy)
Leucobryum albidum (white moss)
Leucobryum glaucum (Pincushion Moss)
Leucocrinum montanum (common starlily)
Leucojum aestivum (spring snowflakes)
Leucophyta brownii (Cushion Bush)
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)
Leucothoë axillaris (drooping leucothoe)
Leucothoë fontanesiana 'Girard's Rainbow' (Rainbow leucothoe)
Lewinskya affinis (Wood Bristle-moss)
Lewisia cotyledon (lewisia)
Leycesteria formosa (Himalayan honeysuckle)
Leymus condensatus (giant wild rye)
Liatris aspera (rough blazing star)
Liatris ligulistylis (Meadow Blazing Star)
Liatris punctata (dotted gayfeather)
Liatris pycnostachya (prairie blazing star)
Liatris spicata (prairie star)
Licuala grandis (Ruffled Fan Palm)
Ligularia dentata (ligularia)
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 vulgare (common privet)
Lilium (Asiatic Hybrids) (Asiatic lilies)
Lilium candidum (Madonna lily)
Lilium michiganense (Michigan lily)
Lilium (Orienpet Hybrids) (orienpet lilies)
Lilium (Oriental Hybrids) (oriental lilies)
Lilium philadelphicum (Wood Lily)
Limbarda crithmoides (Golden Samphire)
Limonium vulgare (Common Sea-lavender)
Linaria canadensis (Canada toadflax)
Linaria dalmatica (Balkan toadflax)
Linaria purpurea (toadflax)
Linaria repens (Pale Toadflax)
Linaria texana (Texas toadflax)
Linaria vulgaris (common toadflax)
Lindera benzoin (northern spicebush)
Lindheimera texana (Texas yellow star)
Lindsaea linearis (Screw Fern)
Lindsaea microphylla (lacy wedge fern)
Linnaea borealis (twinflower)
Linospadix monostachyus (Walking stick palm)
Linum bienne (Pale flax)
Linum catharticum (Fairy Flax)
Linum grandiflorum (Scarlet Flax)
Linum lewisii (Lewis flax)
Linum marginale (Australian Flax)
Linum usitatissimum (common flax)
Liquidambar styraciflua (sweetgum)
Liquidambar styraciflua 'Worplesdon' (Worplesdon Sweet Gum)
Liriodendron tulipifera (tulip tree)
Liriodendron tulipifera 'Aureomarginatum' (Variegated Tulip Tree)
Liriodendron tulipifera 'Fastigiatum' (Fastigiate Tulip Tree)
Liriope muscari (lily turf)
Liriope spicata (Creeping Lilyturf)
Lissanthe strigosa (peach heath)
Lithophragma parviflorum (smallflower woodland star)
Lithospermum canescens (hoary puccoon)
Lithospermum caroliniense (hairy puccoon)
Lithospermum incisum (narrowleaf puccoon)
Lithospermum officinale (Common Gromwell)
Lithospermum ruderale (western stoneseed)
Lithotoma axillaris (rock isotome)
Livistona australis (Australian Fan Palm)
Livistona chinensis (Chinese Fan Palm)
Lobelia anceps (angled lobelia)
Lobelia cardinalis (cardinal flower)
Lobelia erinus (bedding lobelia)
Lobelia gibbosa (tall lobelia)
Lobelia inflata (Indian tobacco)
Lobelia puberula (downy lobelia)
Lobelia purpurascens (White Root)
Lobelia siphilitica (Great Blue Lobelia)
Lobelia spicata (pale-spiked lobelia)
Lobelia trigonocaulis (forest lobelia)
Lobularia maritima (sweet alyssum)
Lolium arundinaceum (tall fescue)
Lolium perenne (Perennial Ryegrass)
Lomandra confertifolia (clumped matrush)
Lomandra filiformis (wattle mat-rush)
Lomandra hystrix (green mat-rush)
Lomandra multiflora (Many Flowered Matrush)
Lomandra obliqua (Fish Bones)
Lomatia ilicifolia (Holly Lomatia)
Lomatia silaifolia (Crinkle Bush)
Lomatium dasycarpum (woollyfruit desertparsley)
Lonicera canadensis (American fly-honeysuckle)
Lonicera ciliosa (trumpet 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 pileata (box-leaved honeysuckle)
Lonicera × purpusii (Winter Beauty Honeysuckle)
Lonicera sempervirens (Coral Honeysuckle)
Lonicera tatarica (Tatarian honeysuckle)
Lonicera xylosteum (Fly Honeysuckle)
Lophiolepis eriophora (Woolly Thistle)
Lophocolea bidentata (Bifid Crestwort)
Lophocolea semiteres (Southern Crestwort)
Lophostemon confertus (Brush Box)
Lophostemon suaveolens (swamp box)
Lotus corniculatus (bird's-foot trefoil)
Lotus pedunculatus (big bird's-foot trefoil)
Ludwigia alternifolia (Seedbox)
Ludwigia octovalvis (Mexican Primrose-willow)
Ludwigia palustris (Water Purslane)
Ludwigia peploides (floating primrose-willow)
Lunaria annua (moneyplant)
Lunularia cruciata (Crescent-cup liverwort)
Lupinus albifrons (Silver Bush Lupine)
Lupinus arboreus (coastal bush lupine)
Lupinus argenteus (silvery lupine)
Lupinus arizonicus (Arizona lupine)
Lupinus bicolor (Miniature Lupine)
Lupinus hirsutissimus (Stinging Lupine)
Lupinus latifolius (wild lupine)
Lupinus microcarpus (chick lupine)
Lupinus nanus (Sky Lupine)
Lupinus perennis (Sundial Lupine)
Lupinus polyphyllus (garden lupine)
Lupinus sparsiflorus (Coulter's lupine)
Lupinus succulentus (arroyo lupine)
Lupinus texensis (Texas bluebonnet)
Luzula campestris (Field woodrush)
Luzula meridionalis (Common Wood-rush)
Luzula parviflora (small-flowered wood rush)
Luzula pilosa (Hairy Woodrush)
Luzula sylvatica (Great Woodrush)
Lychnis alpina (Alpine Campion)
Lychnis coronaria (rose campion)
Lycium barbarum (Goji Berry)
Lycium ferocissimum (African boxthorn)
Lycopodium clavatum (stag's-horn clubmoss)
Lycopodium deuterodensum (Bushy Clubmoss)
Lycopus americanus (American bugleweed)
Lycopus europaeus (European water-horehound)
Lycoris radiata (red spider lily)
Lygodesmia texana (Texas Skeleton Plant)
Lygodium japonicum (Japanese climbing fern)
Lyonia ligustrina (He-huckleberry)
Lyonia lucida (fetterbush lyonia)
Lyperanthus suaveolens (brown beaks)
Lysiana exocarpi (Harlequin Mistletoe)
Lysichiton americanus (swamp lanterns, skunk cabbage)
Lysimachia arvensis (scarlet pimpernel)
Lysimachia borealis (northern starflower)
Lysimachia ciliata 'Purpurea' (purple leaf loosestrife)
Lysimachia europaea (Arctic 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 alatum (Winged Loosestrife)
Lythrum hyssopifolia (Hyssop Loosestrife)
Lythrum salicaria (purple loosestrife)
Macaranga tanarius (Elephant's Ear)
Maclura cochinchinensis (Cockspur Thorn)
Maclura pomifera (Osage-orange)
Macroptilium atropurpureum (Purple Bush-Bean)
Macroptilium lathyroides (Phasey Bean)
Macrozamia communis (burrawang)
Macrozamia riedlei (Zamia Palm)
Madia elegans (Common Madia)
Magnolia 'Elizabeth' (Elizabeth 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 sieboldii (Oyama magnolia)
Magnolia × soulangeana (saucer magnolia)
Magnolia stellata (star magnolia)
Magnolia tripetala (umbrella magnolia)
Magnolia virginiana (Sweetbay Magnolia)
Mahonia aquifolium (Oregon grape)
Mahonia nervosa (dwarf Oregon grape)
Mahonia repens (creeping mahonia)
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)
Maireana brevifolia (Short-leaf Bluebush)
Malacothamnus fasciculatus (southern coastal bushmallow)
Malacothrix glabrata (desert dandelion)
Malacothrix saxatilis (Cliff Aster)
Malaisia scandens (Burnie Vine)
Mallotus claoxyloides (Green Kamala)
Mallotus philippensis (Kamala)
Malosma laurina (laurel sumac)
Malpighia emarginata (Acerola Cherry)
Malus (crabapple)
Malus 'Adirondack' (Adirondack Crabapple)
Malus baccata (Siberian crabapple)
Malus domestica (apple)
Malus 'Evereste' (Evereste Crabapple)
Malus fusca (crabapple)
Malus sylvestris (European Wild Apple)
Malus toringo 'Tina' (Tina Crabapple)
Malva arborea (Tree Mallow)
Malva moschata (musk mallow)
Malva neglecta (dwarf mallow, cheese plant)
Malva parviflora (cheeseweed mallow)
Malvastrum coromandelianum (three-lobe false mallow)
Malva sylvestris (Common Mallow)
Malvaviscus arboreus (Turk's cap)
Mandevilla sanderi (Pink Mandevilla)
Marah fabacea (California manroot)
Marah macrocarpa (Chilicothe)
Marah oregana (bigroot, manroot)
Marchantia polymorpha (Common Liverwort)
Marrubium vulgare (White Horehound)
Marsilea drummondii (Common Nardoo)
Matelea reticulata (Pearl Milkweed)
Matricaria chamomilla (German Chamomile)
Matricaria discoidea (pineapple weed)
Matteuccia struthiopteris (Ostrich Fern)
Matthiola bicornis (night-scented stock)
Maurandella antirrhiniflora (Snapdragon Vine)
Mazus pumilus (Asian mazus)
Meconopsis 'Lingholm' (blue poppy)
Medeola virginiana (Cucumber Root)
Medicago arabica (Spotted medick)
Medicago lupulina (black medic)
Medicago polymorpha (bur clover)
Medicago sativa (Alfalfa)
Megathyrsus maximus (Guinea Grass)
Melaleuca armillaris (Bracelet Honey-myrtle)
Melaleuca bracteata (black tea-tree)
Melaleuca citrina (crimson bottlebrush)
Melaleuca decussata (Totem-poles)
Melaleuca ericifolia (Swamp Paperbark)
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 viminalis (weeping bottlebrush)
Melampodium leucanthum (blackfoot daisy)
Melampyrum lineare (narrowleaf cow wheat)
Melampyrum pratense (Common Cow-wheat)
Melastoma malabathricum (Malabar Melastome)
Melia azedarach (Chinaberry)
Melica uniflora (Wood Melick)
Melichrus urceolatus (urn heath)
Melicope elleryana (pink-flowered doughwood)
Melicytus dentatus (tree violet)
Melilotus albus (White Sweetclover)
Melilotus altissimus (tall melilot)
Melilotus indicus (small melilot)
Melilotus officinalis (Yellow Sweetclover)
Melinis repens (Natal Grass)
Melissa officinalis (Lemon Balm)
Melothria pendula (creeping cucumber)
Menispermum canadense (moonseed)
Mentha aquatica (watermint)
Mentha × piperita (Peppermint)
Mentha pulegium (Pennyroyal)
Mentha spicata (Spearmint)
Mentha suaveolens (Apple Mint)
Mentzelia albicaulis (Whitestem Blazingstar)
Menyanthes trifoliata (Bogbean)
Mercurialis annua (Annual mercury)
Mercurialis perennis (Dog's Mercury)
Mertensia ciliata (mountain bluebells)
Metasequoia glyptostroboides (dawn redwood)
Metrosideros polymorpha (ʻŌhiʻa Lehua)
Metzgeria furcata (Forked Veilwort)
Metzgeria violacea (Bluish Veilwort)
Micranthes stellaris (Hairy Kidney-wort)
Micranthes virginiensis (Virginia saxifrage)
Microbiota decussata (Russian Cypress)
Microlaena stipoides (Weeping-grass)
Microseris walteri (Murnong)
Microsorum diversifolium (Kangaroo Paw Fern)
Microsorum pustulatum (hound's tongue fern)
Microstegium vimineum (Japanese stiltgrass)
Microsteris gracilis (slender phlox)
Microtis arenaria (Pale Onion-orchid)
Microtis parviflora (slender onion-orchid)
Microtis unifolia (common onion-orchid)
Mikania scandens (climbing hempvine)
Milium effusum (Wood Millet)
Mimosa pudica (Sensitive Plant)
Mimosa strigillosa (sunshine mimosa)
Mimulus ringens (Allegheny monkeyflower)
Mirabilis jalapa (Marvel of Peru)
Mirabilis laevis (Wishbone Bush)
Mirabilis multiflora (Colorado Four o'Clock)
Mirabilis nyctaginea (Wild Four o'Clock)
Mirbelia rubiifolia (Heathy Mirbelia)
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 'Variegatus' (Variegated Maiden Grass)
Miscanthus sinensis 'Zebrinus' (Zebra Grass)
Mitchella repens (partridgeberry)
Mitella diphylla (twoleaf miterwort)
Mitrasacme polymorpha (Mitre Weed)
Mnium hornum (Horn Calcareous Moss)
Modiola caroliniana (Bristly Mallow)
Moehringia trinervia (Three-nerved Sandwort)
Molinia caerulea 'Variegata' (Variegated Purple Moor Grass)
Mollugo verticillata (green carpetweed)
Momordica charantia (Bitter Melon)
Monarda bradburiana (Eastern Bee Balm)
Monarda citriodora (lemon beebalm)
Monarda didyma (Bee Balm)
Monarda fistulosa (Wild Bergamot)
Monarda 'Marshall's Delight' (Marshall's Delight Bee Balm)
Monarda 'Petite Delight' (Petite Delight Bee Balm)
Monarda punctata (spotted horsemint)
Monardella odoratissima (mountain coyote mint)
Monardella villosa (Coyote Mint)
Monotoca elliptica (Tree Broom-heath)
Monotoca scoparia (Prickly Broom-heath)
Monotropa hypopitys (pinesap)
Monotropa uniflora (Ghost Pipe)
Monstera adansonii (Swiss Cheese Vine)
Monstera deliciosa (Swiss Cheese Plant)
Monstera siltepecana (Silver Monstera)
Montia fontana (blinks)
Moraea flaccida (Great Tulip)
Moraea setifolia (Paper Glasstulp)
Morella californica (California wax myrtle)
Morella cerifera (Wax Myrtle)
Morella pensylvanica (northern bayberry)
Moringa oleifera (Moringa)
Morus rubra (red mulberry)
Muehlenbeckia adpressa (Climbing Lignum)
Muellerina eucalyptoides (creeping mistletoe)
Muhlenbergia capillaris (Pink Muhly Grass)
Muhlenbergia dumosa (Bamboo Muhly)
Muhlenbergia lindheimeri (Lindheimer's Muhly)
Muhlenbergia reverchonii (Seep Muhly)
Mukdenia rossii 'Karasuba' (Karasuba Mukdenia)
Mummenhoffia alliacea (garlic penny-cress)
Murdannia graminea (Grass Lily)
Musa acuminata (Dwarf Banana Plant)
Musa basjoo (Hardy Banana)
Musa textilis (abacá, Manila hemp)
Muscari armeniacum (grape hyacinth)
Muscari botryoides (common grape hyacinth)
Muscari neglectum (Musk Hyacinth)
Mutarda arvensis (charlock)
Mutarda nigra (Black Mustard)
Mycelis muralis (wall lettuce)
Mycelis muralis (wall lettuce)
Myoporum boninense (Boobialla)
Myoporum insulare (common boobialla)
Myoporum montanum (waterbush)
Myoporum petiolatum (Sticky Boobialla)
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)
Myriophyllum aquaticum (parrotfeather)
Myriophyllum spicatum (Eurasian watermilfoil)
Myrrhis odorata (sweet cicely)
Myrsine howittiana (Brush Muttonwood)
Myrsine variabilis (Variable Muttonwood)
Nabalus albus (white rattlesnake root)
Nabalus altissimus (tall rattlesnake root)
Narcissus (daffodil)
Narcissus 'February Gold' (February Gold Daffodil)
Narcissus 'Jack Snipe' (Jack Snipe Daffodil)
Narcissus 'King Alfred' (King Alfred Daffodil)
Narcissus 'Mount Hood' (Mount Hood Daffodil)
Narcissus pseudonarcissus (wild daffodil)
Narcissus 'Saint Keverne' (Saint Keverne Daffodil)
Narcissus 'Thalia' (Thalia Daffodil)
Narthecium ossifragum (bog asphodel)
Nassella tenuissima (Mexican feather/hair grass)
Nasturtium officinale (Watercress)
Nekemias arborea (peppervine)
Neltuma glandulosa (honey mesquite)
Neltuma odorata (western honey mesquite)
Neltuma velutina (velvet mesquite)
Nelumbo lutea (American lotus)
Nematanthus spp. (goldfish plant)
Nemophila menziesii (Menzies' baby blue eyes)
Nemophila phacelioides (Texas baby blue eyes)
Neolitsea dealbata (Bolly Gum)
Neottia nidus-avis (bird's-nest orchid)
Neottia ovata (Common Twayblade)
Nephroia carolina (Carolina snailseed)
Nephrolepis cordifolia (Fishbone Fern)
Nephrolepis exaltata (Boston Fern)
Nephrolepis obliterata (Kimberley Queen Fern)
Neurachne alopecuroidea (foxtail mulga grass)
Nicandra physalodes (apple-of-Peru)
Nicotiana glauca (tree tobacco)
Nicotiana obtusifolia (desert tobacco)
Nitraria billardierei (nitre bush)
Notelaea longifolia (Large Mock-olive)
Notelaea microcarpa (small-fruited mock olive)
Nothofagus cunninghamii (Myrtle Beech)
Notholithocarpus densiflorus (Tanoak)
Nothoscordum bivalve (crowpoison)
Nuphar advena (spatterdock)
Nuphar lutea (yellow water-lily)
Nuphar variegata (Variegated Yellow Pond-Lily)
Nuytsia floribunda (Western Australian Christmas Tree)
Nymphaea alba (European White Waterlily)
Nymphaea odorata (American white waterlily)
Nymphoides indica (Water Snowflake)
Nymphoides peltata (water fringe)
Nyssa sylvatica (sour gum, tupelo)
Oceaniopteris cartilaginea (hammock fern)
Ochna serrulata (Small-leaved plane)
Oclemena acuminata (whorled wood aster)
Odontites vernus (Red Bartsia)
Odontites vulgaris (Red Odontites)
Oemleria cerasiformis (osoberry)
Oenanthe crocata (Hemlock Water-dropwort)
Oenanthe pimpinelloides (Corky-fruited Water-dropwort)
Oenanthe sarmentosa (water-parsley)
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 suffrutescens (Scarlet Beeblossom)
Oenothera suffulta (roadside gaura)
Oenothera triloba (Stemless Evening Primrose)
Olea europaea (Olive Tree)
Olearia argophylla (musk daisy-bush)
Olearia axillaris (Coastal Daisy-Bush)
Olearia lirata (snowy daisy-bush)
Olearia phlogopappa (Asthma Bush)
Olearia ramulosa (Twiggy Daisy-Bush)
Olneya tesota (desert ironwood)
Oncidium sphacelatum (Spider Orchid Bush)
Oncosiphon pilulifer (stinknet)
Onobrychis viciifolia (Sainfoin)
Onoclea sensibilis (sensitive fern)
Ononis spinosa (Spiny restharrow)
Onopordum acanthium (Scotch thistle)
Ophioglossum vulgatum (southern adder's-tongue)
Ophiopogon japonicus (Mondo Grass)
Ophiopogon planiscapus 'Nigrescens' (Black mondo grass)
Ophrys apifera (Bee Orchid)
Ophrys insectifera (Fly Orchid)
Oplismenus hirtellus (Basket Grass)
Oplopanax horridus (devil's club)
Opuntia austrina (Florida Pricklypear)
Opuntia basilaris (Beavertail Pricklypear)
Opuntia cespitosa (Eastern Pricklypear)
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)
Orchis anthropophora (Man Orchid)
Orchis mascula (Early Purple Orchid)
Orchis purpurea (Lady Orchid)
Oreopteris limbosperma (Lemon-scented Fern)
Origanum majorana (Sweet Marjoram)
Origanum vulgare (Oregano)
Ornithogalum umbellatum (common star-of-Bethlehem)
Ornithopus perpusillus (Bird's-foot)
Orobanche hederae (ivy broomrape)
Orobanche minor (Common Broomrape)
Orthilia secunda (one-sided wintergreen)
Orthoceras strictum (Birds mouth orchid)
Orthotrichum anomalum (Anomalous Bristle-moss)
Orthotrichum diaphanum (White-tipped Bristle-moss)
Orthotrichum pulchellum (Elegant Bristle-moss)
Osmanthus delavayi (Delavay osmanthus)
Osmanthus × fortunei (Fortune's Osmanthus)
Osmanthus fragrans (Sweet Osmanthus)
Osmanthus heterophyllus (holly-leaved osmanthus)
Osmanthus heterophyllus 'Goshiki' (Goshiki holly-leaf osmanthus)
Osmanthus heterophyllus 'Variegatus' (Variegated holly osmanthus)
Osmanthus x burkwoodii (Burkwood osmanthus)
Osmorhiza berteroi (mountain sweet cicely)
Osmorhiza claytonii (hairy sweet cicely)
Osmorhiza longistylis (aniseroot)
Osmunda claytoniana (interrupted fern)
Osmunda regalis (Royal Fern)
Osmunda regalis 'Purpurascens' (Purple Royal Fern)
Osmunda spectabilis (American Royal Fern)
Osmundastrum cinnamomeum (Cinnamon Fern)
Osmundea pinnatifida (Pepper Dulse)
Osteospermum moniliferum (Bietou)
Ostrya virginiana (American hophornbeam)
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 rubra (red pigweed)
Oxydendrum arboreum (sourwood)
Oxylobium ellipticum (golden shaggy-pea)
Oxyrrhynchium hians (Swartz's Feather-moss)
Oxytropis lambertii (Lambert's Locoweed)
Ozothamnus diosmifolius (Sago Flower)
Ozothamnus ferrugineus (Tree Everlasting)
Ozothamnus obcordatus (Grey Everlasting)
Ozothamnus turbinatus (Coast Everlasting)
Pachira aquatica (Money Tree)
Pachyphragma macrophyllum (giant spring brassica)
Pachysandra terminalis (Japanese spurge)
Pachysandra terminalis 'Variegata' (Variegated Japanese spurge)
Packera anonyma (Small's ragwort)
Packera aurea (golden ragwort)
Packera glabella (Butterweed)
Packera obovata (roundleaf ragwort)
Paeonia californica (California Peony)
Paeonia lactiflora (garden peony)
Paeonia officinalis (common peony)
Paeonia ssp. (tree peony)
Palmaria palmata (Dulse)
Panax trifolius (dwarf ginseng)
Pandanus tectorius (thatch screwpine)
Pandorea jasminoides (Bower Plant)
Pandorea pandorana (wonga vine)
Panicum amarum (Bitter Panicgrass)
Panicum virgatum (Switchgrass)
Papaver atlanticum (Atlas Poppy)
Papaver cambricum (welsh poppy)
Papaver dubium (Long-headed poppy)
Papaver orientale (Oriental poppy)
Papaver rhoeas (common poppy)
Papaver somniferum (opium poppy)
Parahebe perfoliata (Koromiko)
Paraserianthes lophantha (Plume Albizia)
Paratrophis pendulina (whalebone tree)
Parietaria judaica (pellitory-of-the-wall)
Parietaria pensylvanica (Pennsylvania pellitory)
Paris polyphylla (multi-leaf paris)
Paris quadrifolia (herb paris)
Parkinsonia aculeata (Mexican palo verde)
Parkinsonia florida (blue palo verde)
Parkinsonia microphylla (little-leaved palo verde)
Parnassia palustris (marsh grass-of-Parnassus)
Parrotia persica (Persian parrotia, ironwood)
Parsonsia straminea (Common Silkpod)
Parthenium hysterophorus (Santa Maria feverfew)
Parthenium integrifolium (wild quinine)
Parthenocissus inserta (thicket creeper)
Parthenocissus tricuspidata (Boston ivy)
Paspalum dilatatum (Dallis grass)
Paspalum notatum (Bahia Grass)
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 fragilis (Short Purple-flag)
Patersonia glabrata (Leafy Purple Flag)
Patersonia occidentalis (Purple Flag)
Patersonia sericea (Silky Purple Flag)
Paulownia tomentosa (empress tree)
Pauridia vaginata (yellow star)
Pavonia hastata (Spearleaf Swampmallow)
Pavonia lasiopetala (Rose pavonia)
Pedicularis canadensis (Canadian lousewort)
Pedicularis densiflora (Warrior's Plume)
Pedicularis groenlandica (Elephant's-Head lousewort)
Pedicularis palustris (Marsh Lousewort)
Pedicularis sylvatica (Common Lousewort)
Pediocactus simpsonii (Mountain Ball Cactus)
Pediomelum tenuiflorum (Slimflower Scurfpea)
Pelargonium australe (Austral Stork's-bill)
Pelargonium capitatum (rose-scented geranium)
Pelargonium rodneyanum (magenta stork's-bill)
Pelazoneuron kunthii (Widespread Maiden Fern)
Pellaea andromedifolia (Coffee Fern)
Pellaea atropurpurea (purple-stem cliffbrake)
Pellaea falcata (Sickle Fern)
Pellaea mucronata (bird's foot cliffbrake)
Pellaea rotundifolia (Button Fern)
Pellia epiphylla (common pellia)
Peltandra virginica (Green Arrow Arum)
Pennisetum alopecuroides (Fountain Grass)
Penstemon centranthifolius (scarlet bugler)
Penstemon cobaea (cobaea beardtongue)
Penstemon digitalis (foxglove beardtongue)
Penstemon digitalis 'Husker Red' (Husker Red Penstemon)
Penstemon Hybrids (Beard Tongue)
Penstemon newberryi (Mountain Pride)
Penstemon pallidus (Pale Beardtongue)
Penstemon 'Raven' (Raven Penstemon)
Penstemon smallii (Smalls Beardtongue)
Penstemon spectabilis (Showy Penstemon)
Penstemon whippleanus (Whipple's penstemon)
Pentaglottis sempervirens (Green Alkanet)
Pentagramma triangularis (goldback fern)
Pentanema squarrosum (Ploughman's-spikenard)
Peperomia argyreia (Watermelon Peperomia)
Peperomia leptostachya (Slender Peperomia)
Peperomia obtusifolia (Baby Rubber Plant)
Perilla frutescens (beefsteak plant)
Perityle emoryi (Emory's rockdaisy)
Perovskia atriplicifolia 'Little Spire' (Little Spire Russian Sage)
Perovskia 'Filigran' (Filigran Russian Sage)
Perovskia 'Longin' (Longin Russian Sage)
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 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 pubescens (quinine bush)
Petasites albus (White Butterbur)
Petasites frigidus (coltsfoot)
Petasites hybridus (Common Butterbur)
Petasites japonicus (fuki,butterburr)
Petasites pyrenaicus (Winter Heliotrope)
Petrophile pulchella (Conesticks)
Petrosedum rupestre (Reflexed Stonecrop)
Phacelia bipinnatifida (Purple 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 minor (wild canterbury bells)
Phacelia ramosissima (branching phacelia)
Phacelia tanacetifolia (Lacy phacelia)
Phalaris aquatica (harding grass)
Phalaris arundinacea (reed canary grass)
Phaseolus vulgaris 'Blue Lake' (Blue Lake Green Bean)
Phaseolus vulgaris 'Kentucky Wonder' (Kentucky Wonder Bean)
Phaseolus vulgaris 'Provider' (Provider Bush Bean)
Phebalium squamulosum (scaly phebalium)
Phedimus kamtschaticus (Orange Stonecrop)
Phedimus selskianus (Selsky Stonecrop)
Phegopteris decursive-pinnata (Japanese Beech Fern)
Phegopteris hexagonoptera (broad beech fern)
Pheladenia deformis (Blue Fairy Orchid)
Philadelphus coronarius 'Aureus' (Golden Mock Orange)
Philadelphus 'Snowbelle' (Snowbelle Mock Orange)
Philadelphus spp. (mock orange)
Philodendron gloriosum (Glorious Philodendron)
Philodendron hastatum (Silver Sword Philodendron)
Philodendron hederaceum (Heartleaf Philodendron)
Philydrum lanuginosum (woolly frog's-mouth)
Phlebodium aureum (Blue Star Fern)
Phleum pratense (Timothy grass)
Phlomis russeliana (Jerusalem sage)
Phlox diffusa (spreading phlox)
Phlox divaricata (Woodland Phlox)
Phlox drummondii (Drummond's phlox)
Phlox hoodii (spiny phlox)
Phlox longifolia (Longleaf Phlox)
Phlox paniculata (Garden Phlox)
Phlox pilosa (prairie phlox)
Phoenix canariensis (Canary Island palm)
Phoenix roebelenii (Pygmy Date Palm)
Phoenix sylvestris (Silver Date Palm)
Pholistoma auritum (Fiesta Flower)
Phoradendron californicum (Mesquite Mistletoe)
Phoradendron leucarpum (American Mistletoe)
Photinia davidiana (tall stranvaesia)
Photinia serratifolia (Chinese Photinia)
Photinia x fraseri (Red tip photinia)
Phragmites australis (common reed)
Phryma leptostachya (American lopseed)
Phygelius x rectus (Cape Fuchsia)
Phygelius x rectus Hybrids (cape fuchsia)
Phyla lanceolata (lanceleaf frogfruit)
Phyla nodiflora (turkey tangle frogfruit)
Phyllanthus calycinus (False Boronia)
Phyllanthus hirtellus (Thyme Spurge)
Phyllanthus urinaria (Chamberbitter)
Phyllostachys aurea (golden bamboo)
Phyllostachys nigra (black bamboo)
Phyllota phylicoides (Common Phyllota)
Phyllota pleurandroides (Heathy Phyllota)
Physalis crassifolia (Thickleaf Groundcherry)
Physalis longifolia (long-leaved groundcherry)
Physocarpus capitatus (Pacific ninebark)
Physocarpus opulifolius 'Diabolo' (Diabolo Ninebark)
Physocarpus opulifolius 'Monlo' (Diabolo® ninebark)
Physocarpus opulifolius 'Seward' (Summer Wine Ninebark)
Physostegia virginiana (Obedient Plant)
Phyteuma scheuchzeri (Oxford Rampion)
Phytolacca americana (American pokeweed)
Phytolacca octandra (Inkweed)
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 'Reflexa' (weeping Norway spruce)
Picea engelmannii (Engelmann spruce)
Picea glauca (white spruce)
Picea glauca 'Conica' (Dwarf Alberta Spruce)
Picea mariana (black spruce)
Picea omorika (Serbian Spruce)
Picea orientalis (Oriental spruce)
Picea orientalis 'Aurea' (Golden Oriental Spruce)
Picea orientalis 'Aureospicata' (Golden Oriental Spruce)
Picea pungens 'Glauca' (Colorado Blue Spruce)
Picea rubens (red spruce)
Picea sitchensis (Sitka Spruce)
Picris hieracioides (Hawkweed Oxtongue)
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 '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 monopetala (Lady's Slipper)
Pigea stellarioides (spade flower)
Pilea microphylla (Artillery Plant)
Pilea pumila (Canada clearweed)
Pilosella aurantiaca (orange hawkweed)
Pilosella caespitosa (meadow hawkweed)
Pilosella officinarum (mouse-eared hawkweed)
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)
Pimpinella saxifraga (Burnet-saxifrage)
Pinguicula vulgaris (Common Butterwort)
Pinus brachyptera (Southwestern Ponderosa Pine)
Pinus cembra (Swiss stone 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 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)
Piper hederaceum (Australian Pepper Vine)
Piper nigrum (Black Pepper Plant)
Pistacia chinensis (Chinese pistache)
Pistacia lentiscus (mastic)
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)
Plagiobothrys nothofulvus (Rusty Popcornflower)
Plagiomnium cuspidatum (Woodsy Thyme-moss)
Plagiomnium undulatum (Palm-tree Moss)
Plagiothecium undulatum (Waved Silk-moss)
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 rhodosperma (redseed plantain)
Plantago rugelii (American plantain)
Plantago virginica (dwarf plantain)
Platanthera chlorantha (Greater butterfly-orchid)
Platanthera dilatata (white bog orchid)
Platanus × acerifolia (London plane tree)
Platanus occidentalis (American Sycamore)
Platanus orientalis (Oriental Plane)
Platanus racemosa (California Sycamore)
Platycerium bifurcatum (Staghorn Fern)
Platycerium superbum (Stag Horn Fern)
Platylobium formosum (Handsome Flat Pea)
Platylobium obtusangulum (Common Flat-pea)
Platysace lanceolata (Shrubby Platysace)
Platysace linearifolia (Carrot Tops)
Platystemon californicus (creamcups)
Plectocephalus americanus (American basketflower)
Plectritis congesta (shortspur seablush)
Pleioblastus pygmaeus (dwarf bamboo)
Plenogemma phyllantha (Frizzled Pincushion)
Pleopeltis michauxiana (resurrection fern)
Pleurozium schreberi (Red-stemmed Feather Moss)
Pluchea camphorata (Camphor-weed)
Pluchea odorata (marsh fleabane)
Plumeria rubra (Plumeria)
Poa annua (annual bluegrass)
Poa bulbosa (Bulbous Bluegrass)
Poa labillardierei (common tussock grass)
Poa pratensis (Kentucky Bluegrass)
Poa trivialis (Rough Meadow-grass)
Podocarpus elatus (Plum Pine)
Podolobium ilicifolium (Prickly Shaggy Pea)
Podophyllum peltatum (mayapple)
Podophyllum pleianthum (Chinese mayapple)
Podophyllum 'Spotty Dotty' (Spotty Dotty mayapple)
Podosphaera xanthii (Cucurbit Powdery Mildew)
Pogonia ophioglossoides (Rose Pogonia)
Polanisia dodecandra (redwhisker clammyweed)
Polemonium caeruleum 'Snow and Sapphires' (Snow and Sapphires Jacob's Ladder)
Polemonium reptans (Jacob's ladder)
Polycarpon tetraphyllum (fourleaf manyseed)
Polygala myrtifolia (Sweet Pea Shrub)
Polygala serpyllifolia (Heath Milkwort)
Polygala vulgaris (Common Milkwort)
Polygaloides paucifolia (fringed polygala)
Polygonatum (Solomon's seal)
Polygonatum biflorum (Solomons Seal)
Polygonatum multiflorum (Solomon's-seal)
Polygonatum odoratum 'Variegatum' (Variegated Solomon's Seal)
Polygonatum pubescens (hairy Solomon's-seal)
Polygonatum x hybridum
Polygonum arenastrum (Oval Leaf Knotweed)
Polygonum aviculare (common knotweed)
Polymeria calycina (slender bindweed)
Polymnia canadensis (leafcup)
Polypodium californicum (California Polypody)
Polypodium glycyrrhiza (licorice fern)
Polypodium interjectum (intermediate polypody)
Polypodium virginianum (rock polypody)
Polypodium vulgare (common polypody)
Polypogon monspeliensis (rabbitfoot grass)
Polypogon viridis (water beard grass)
Polypremum procumbens (Rust Weed)
Polyscias elegans (celery wood)
Polyscias sambucifolia (Elderberry Panax)
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)
Polytaenia texana (Texas Prairie Parsley)
Polytrichum commune (Common Haircap Moss)
Polytrichum formosum (Bank Haircap Moss)
Polytrichum juniperinum (juniper haircap moss)
Polytrichum piliferum (bristly haircap moss)
Pomaderris apetala (Tainui)
Pomaderris aspera (Hazel Pomaderris)
Pomax umbellata (pomax)
Pontederia cordata (pickerelweed)
Pontederia crassipes (common water hyacinth)
Populus alba (white poplar)
Populus balsamifera ssp. trichocarpa (black cottonwood)
Populus deltoides (Eastern Cottonwood)
Populus fremontii (Frémont Cottonwood)
Populus grandidentata (bigtooth aspen)
Populus nigra 'Italica' (Lombardy poplar)
Populus tremula (European aspen)
Populus tremuloides (quaking aspen)
Populus trichocarpa (cottonwood)
Poranthera microphylla (Small Poranthera)
Portulaca oleracea (purslane)
Portulaca pilosa (shaggy portulaca)
Posidonia australis (fibre-ball weed)
Potamogeton natans (floating-leaved pondweed)
Potamogeton polygonifolius (Bog Pondweed)
Potentilla anglica (English cinquefoil)
Potentilla argentea (Silvery Cinquefoil)
Potentilla canadensis (dwarf cinquefoil)
Potentilla erecta (Tormentil)
Potentilla indica (mock strawberry)
Potentilla norvegica (rough cinquefoil)
Potentilla recta (sulfur cinquefoil)
Potentilla reptans (Creeping cinquefoil)
Potentilla simplex (common cinquefoil)
Potentilla sterilis (Barren Strawberry)
Pothos longipes (candle vine)
Prasophyllum elatum (Tall Leek Orchid)
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 sieboldii (sakura)
Primula veris (Cowslip)
Prosartes smithii (Largeflower Fairybells)
Prostanthera cuneata (alpine mint bush)
Prostanthera lasianthos (Christmas Bush)
Prunella vulgaris (self heal)
Prunus americana (American plum)
Prunus angustifolia (Chickasaw plum)
Prunus caroliniana (Carolina laurelcherry)
Prunus cerasifera (purple leaf plum, cherry plum)
Prunus cerasifera 'Thundercloud' (Thundercloud Plum)
Prunus domestica (European plum)
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 'Zabeliana' (Zabel laurel)
Prunus lusitanica (Portuguese laurel)
Prunus mexicana (Mexican Plum)
Prunus padus (bird cherry)
Prunus pensylvanica (fire cherry)
Prunus serotina (Black Cherry)
Prunus serrulata ((in the Sato-Zakura group))
Prunus 'Shirotae' (Mt. Fuji flowering cherry)
Prunus spinosa (Blackthorn)
Prunus subhirtella 'Pendula' (weeping flowering cherry)
Prunus virginiana (Chokecherry)
Prunus × yedoensis (Yoshino flowering cherry)
Pseudanomodon attenuatus (tree-skirt moss)
Pseuderanthemum variabile (Pastel Flower)
Pseudisothecium myosuroides (Mouse-tail Moss)
Pseudisothecium stoloniferum (Cat's Tail Moss)
Pseudofumaria lutea (Yellow Fumitory)
Pseudognaphalium biolettii (two-color rabbit tobacco)
Pseudognaphalium californicum (California cudweed)
Pseudognaphalium luteoalbum (Jersey Cudweed)
Pseudognaphalium obtusifolium (sweet everlasting)
Pseudogynoxys chenopodioides (Mexican Flame Vine)
Pseudosasa japonica (Arrow Bamboo)
Pseudoscleropodium purum (Neat Feather-moss)
Pseudotrillium rivale (brook wakerobin)
Pseudotsuga menziesii (Douglas fir)
Pseudotsuga menziesii 'Graceful Grace' (Graceful Grace Douglas Fir)
Pseudotsuga menziesii 'Pendula' (weeping Douglas fir)
Psidium guajava (White Guava)
Psilotum nudum (skeleton fork fern)
Psorodendron schottii (indigo-bush)
Psychotria loniceroides (Hairy Psychotria)
Psychotria nervosa (Shiny-leaved Wild Coffee)
Psydrax odoratus (Lamboto)
Ptelea trifoliata (common hoptree)
Pteridium aquilinum (bracken fern)
Pteridium esculentum (Austral Bracken)
Pteris tremula (Shaking Brake)
Pterocarya fraxinifolia (Caucasian Wingnut)
Pterocaulon pycnostachyum (blackroot)
Pterospora andromedea (woodland pinedrops)
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)
Ptilotus exaltatus (Pink Mulla Mulla)
Ptilotus obovatus (cotton bush)
Ptilotus polystachyus (Prince of Wales Feather)
Ptychomnion aciculare (pipe-cleaner moss)
Ptychostomum capillare (Capillary Thread-moss)
Pueraria montana (kudzu)
Pulicaria dysenterica (Common Fleabane)
Pullenia gunnii (slender tick-trefoil)
Pulmonaria (lungwort)
Pulmonaria obscura (Suffolk Lungwort)
Pulmonaria officinalis (Lungwort)
Pulsatilla nuttalliana (prairie pasqueflower)
Pulsatilla occidentalis (Western pasqueflower)
Pulsatilla patens (Eastern Pasque Flower)
Pulsatilla vulgaris (common pasqueflower)
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)
Purshia stansburyana (Stansbury's Cliffrose)
Purshia tridentata (Antelope Bitterbrush)
Pycnanthemum muticum (Short-Toothed Mountain Mint)
Pycnanthemum pilosum (Hairy Mountain Mint)
Pycnanthemum tenuifolium (narrowleaf mountainmint)
Pycnanthemum virginianum (Virginia Mountain Mint)
Pyracantha spp. (firethorn pyracantha)
Pyrola americana (American wintergreen)
Pyrola asarifolia (bog wintergreen)
Pyrola elliptica (shinleaf)
Pyrorchis nigricans (Red Beaks)
Pyrrhopappus carolinianus (Carolina desert-chicory)
Pyrrhopappus pauciflorus (smallflower desert-chicory)
Pyrrosia rupestris (Rock Felt Fern)
Pyrus calleryana (Callery flowering pear)
Pyrus salicifolia 'Pendula' (Weeping Silver Pear)
Quercus agrifolia (Coast Live Oak)
Quercus alba (White 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 frainetto (Hungarian oak)
Quercus fusiformis (Texas live oak)
Quercus gambelii (Gambel Oak)
Quercus garryana (Oregon white oak, Garry oak)
Quercus geminata (sand live oak)
Quercus ilex (holly oak)
Quercus ilicifolia (bear oak)
Quercus laevis (American turkey oak)
Quercus laurifolia (swamp laurel oak)
Quercus lobata (Valley Oak)
Quercus macrocarpa (Bur Oak)
Quercus marilandica (blackjack oak)
Quercus michauxii (swamp chestnut oak)
Quercus montana (chestnut oak)
Quercus muehlenbergii (chinkapin 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 stellata (post oak)
Quercus suber (cork oak)
Quercus turbinella (Sonoran scrub oak)
Quercus velutina (black oak)
Quercus virginiana (Southern Live Oak)
Rabelera holostea (greater stitchwort)
Racomitrium lanuginosum (Woolly Fringe-moss)
Radula complanata (Flat-leaved Scalewort)
Rafinesquia neomexicana (Desert Chicory)
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 flammula (Lesser Spearwort)
Ranunculus lappaceus (Australian Buttercup)
Ranunculus lingua (Greater Spearwort)
Ranunculus muricatus (Rough-fruited buttercup)
Ranunculus omiophyllus (Round-leaved Crowfoot)
Ranunculus recurvatus (Hooked buttercup)
Ranunculus repens (creeping buttercup)
Ranunculus sardous (hairy buttercup)
Ranunculus sceleratus (cursed crowfoot)
Raphanus raphanistrum (Wild radish)
Rapistrum rugosum (annual bastard cabbage)
Ratibida columnifera (upright prairie coneflower)
Ratibida pinnata (grey-headed coneflower)
Ravenea rivularis (Majesty Palm)
Reseda lutea (Wild Mignonette)
Reseda luteola (Weld)
Reynoutria japonica (Japanese knotweed)
Rhagodia candolleana (Seaberry Saltbush)
Rhamnus cathartica (common buckthorn)
Rhamnus crocea (Redberry Buckthorn)
Rhamnus ilicifolia (hollyleaf redberry)
Rhaphiolepis indica (Indian Hawthorn)
Rhaphiolepis umbellata 'Minor' (rhaphiolepis)
Rhapidophyllum hystrix (Needle Palm)
Rhapis excelsa (Lady Palm Tree)
Rheum palmatum 'Atrosanguineum' (ornamental rhubarb)
Rheum rhabarbarum (Rhubarb)
Rhexia mariana (Maryland meadowbeauty)
Rhexia virginica (Virginia meadowbeauty)
Rhinanthus minor (Yellow Rattle)
Rhizomnium punctatum (Dotted Thyme-moss)
Rhizophora mangle (red mangrove)
Rhizophora stylosa (spotted mangrove)
Rhodamnia rubescens (scrub turpentine)
Rhodiola rosea (Roseroot)
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 'Christmas Cheer' (Christmas Cheer Rhododendron)
Rhododendron 'Cilpinense' (Cilpinense Rhododendron)
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 '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 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 maximum (great rhododendron)
Rhododendron menziesii (mock azalea)
Rhododendron mucronulatum (Korean azalea)
Rhododendron 'Nancy Evans' (Nancy Evans 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 quinquefolium (quinquefolium azalea)
Rhododendron 'Rosa Mundi' (Rosa Mundi Rhododendron)
Rhododendron schlippenbachii (royal azalea)
Rhododendron 'Snowbird' (Snowbird Rhododendron)
Rhododendron stenopetalum 'Linearifolium' (spider azalea)
Rhododendron 'Unique' (Unique Rhododendron)
Rhododendron 'Vulcan''s Flame' (Vulcan's Flame Rhododendron)
Rhododendron yakushimanum (yakushima rhododendron)
Rhodomyrtus psidioides (Native Guava)
Rhodosphaera rhodanthema (deep yellow wood)
Rhodotypos scandens (jetbead)
Rhus aromatica (fragrant sumac)
Rhus copallinum (shining sumac)
Rhus glabra (smooth sumac)
Rhus integrifolia (lemonade berry)
Rhus ovata (sugar bush)
Rhus trilobata (Skunkbush Sumac)
Rhus typhina (staghorn sumac)
Rhus typhina 'Dissecta' (cutleaf staghorn sumac)
Rhus virens (evergreen sumac)
Rhynchospora colorata (White-Top Sedge)
Rhynchostegium confertum (Clustered Feather-moss)
Rhytidiadelphus loreus (Lanky Moss)
Rhytidiadelphus squarrosus (Square Gooseneck Moss)
Rhytidosporum procumbens (white marianth)
Ribes bracteosum (stink current)
Ribes cereum (wax currant)
Ribes cynosbati (prickly gooseberry)
Ribes lacustre (swamp gooseberry)
Ribes missouriense (Missouri Gooseberry)
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)
Richardia grandiflora (largeflower Mexican clover)
Richea pandanifolia (Pandani)
Richea scoparia (scoparia)
Ricinocarpos pinifolius (Wedding Bush)
Ricinus communis (castor bean)
Rivina humilis (pigeonberry)
Robinia pseudoacacia (black locust)
Robinia pseudoacacia 'Frisia' (golden black locust)
Rodgersia (rodgersia)
Romneya coulteri (Matilija poppy)
Romulea rosea (Rosy sandcrocus)
Rorippa palustris (Bog Yellowcress)
Rosa acicularis (Prickly Wild Rose)
Rosa 'Adélaide d''Orléans' (Adelaide d'Orleans Rose)
Rosa 'Alain Blanchard' (Alain Blanchard Rose)
Rosa arkansana (prairie rose)
Rosa arvensis (Field Rose)
Rosa 'Autumn Sunset' (Autumn Sunset Rose)
Rosa 'Buff Beauty' (Buff Beauty Rose)
Rosa californica (California Wild Rose)
Rosa canina (dog rose)
Rosa carolina (Carolina 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 glauca (redleaf rose)
Rosa 'Golden Wings' (Golden Wings Rose)
Rosa gymnocarpa (bald-hip rose)
Rosa gymnocarpa (bald-hip rose)
Rosa 'Hansa' (Hansa 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 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 setigera (climbing prairie rose)
Rosa spinosissima (Burnet Rose)
Rosulabryum billardierei
Rubia peregrina (Wild Madder)
Rubus allegheniensis (Allegheny blackberry)
Rubus armeniacus (Himalayan blackberry)
Rubus caesius (European dewberry)
Rubus chamaemorus (cloudberry)
Rubus flagellaris (Common Dewberry)
Rubus hayata-koidzumii (creeping raspberry)
Rubus hispidus (swamp dewberry)
Rubus idaeus (raspberry)
Rubus laciniatus (evergreen blackberry)
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 rosifolius (roseleaf bramble)
Rubus spectabilis (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 amplexicaulis (clasping coneflower)
Rudbeckia hirta (large black-eyed Susan)
Rudbeckia laciniata (cutleaf coneflower)
Rudbeckia triloba (Brown-Eyed Susan)
Ruellia caroliniensis (Carolina ruellia)
Ruellia humilis (hairy ruellia)
Ruellia nudiflora (violet ruellia)
Ruellia simplex (Mexican Petunia)
Ruellia strepens (smooth ruellia)
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 hydrolapathum (Water Dock)
Rumex hymenosepalus (Canaigre Dock)
Rumex obtusifolius (broad-leaved dock)
Rumex sagittatus (Climbing dock)
Rumex sanguineus (Wood Dock)
Ruscus aculeatus (butcher's-broom)
Rytidosperma pallidum (red-anther wallaby grass)
Sabal minor (Dwarf Palmetto)
Sabal palmetto (cabbage palmetto)
Sabatia angularis (Rosepink)
Sabatia campestris (Meadow Pink)
Sagina procumbens (pearlwort)
Sagina subulata (Irish moss)
Sagittaria lancifolia (lanceleaf arrowhead)
Sagittaria sagittifolia (Arrowhead)
Salicornia europaea (Common Glasswort)
Salicornia pacifica (Pacific Glasswort)
Salicornia quinqueflora (Beaded Samphire)
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 cinerea (Grey Willow)
Salix discolor (White Pussy Willow)
Salix exigua (Narrowleaf Willow)
Salix gooddingii (Goodding's willow)
Salix integra 'Hakuro Nishiki' (Variegated Willow)
Salix interior (interior sandbar willow)
Salix lasiolepis (Arroyo Willow)
Salix × matsudana × alba (Willow Hybrid Tree)
Salix nigra (black 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 australis (Southern Russian Thistle)
Salsola tragus (Prickly Russian Thistle)
Salvia apiana (white sage)
Salvia azurea (giant blue sage)
Salvia coccinea (Tropical sage)
Salvia columbariae (Chia)
Salvia fulgens (cardinal sage)
Salvia greggii (Autumn 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 rosmarinus (rosemary)
Salvia spathacea (Hummingbird Sage)
Salvia verbenaca (wild clary)
Salvia x sylvestris 'Caradonna' (caradonna sage)
Sambucus canadensis (American black elderberry)
Sambucus gaudichaudiana (White Elderberry)
Sambucus nigra 'Black Lace' (Black Lace Elderberry)
Sambucus racemosa (red elderberry)
Sambucus spp. (elderberry)
Samolus repens (Sea Primrose)
Sanguisorba minor (Salad Burnet)
Sanguisorbia hakusanensis 'Lilac Squirrel' (Pink squirrel tails)
Sanicula bipinnatifida (Purple Sanicle)
Sanicula canadensis (Black Snakeroot)
Sanicula crassicaulis (Pacific Sanicle)
Sanicula europaea (wood sanicle)
Sanicula odorata (Clustered Sanicle)
Sansevieria trifasciata (Snake Plant)
Santalum acuminatum (Desert Quandong)
Santalum lanceolatum (Blue Bush)
Santolina chamaecyparissus (cotton vavender)
Santolina rosmarinifolia (Green Lavender Cotton)
Sapindus drummondii (Western Soapberry)
Saponaria officinalis (common soapwort)
Sarcococca confusa (tall sarcococca)
Sarcococca hookeriana var. humilis (low sarcococca)
Sarcodes sanguinea (Snowplant)
Sarcopetalum harveyanum (pearl vine)
Sarracenia flava (yellow pitcher plant)
Sarracenia purpurea (purple pitcher plant)
Saruma henryi (upright wild ginger)
Satureja hortensis (Summer Savory)
Satureja montana (Winter Savory)
Saururus cernuus (Lizard's Tail)
Saxifraga aizoides (Yellow Saxifrage)
Saxifraga granulata (Meadow Saxifrage)
Saxifraga stolonifera (strawberry begonia)
Saxifraga tridactylites (Rue-leaved Saxifrage)
Saxifraga x urbium (London pride)
Scabiosa canescens (Gray Pincushion Flower)
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 intermedia (Swedish Whitebeam)
Sceptridium dissectum (Cutleaf Grapefern)
Schelhammera undulata (lilac lily)
Schinus areira (Peppercorn Tree)
Schinus molle (Peruvian Pepper Tree)
Schinus terebinthifolia (Brazilian pepper)
Schisandra chinensis (Five-flavor Berry)
Schistidium crassipilum (Thickpoint Bloom Moss)
Schizachyrium scoparium (Little Bluestem)
Schizaea bifida (Forked Comb Fern)
Schizophragma hydrangeoides (Japanese Climbing Hydrangea)
Schoenoplectus acutus (hardstem bulrush)
Schoenus apogon (common bog-rush)
Sciadopitys verticillata (Japanese umbrella pine)
Scilla forbesii (Forbes' Glory-of-the-snow)
Scilla verna (Spring Squill)
Scindapsus pictus (Satin Pothos)
Scirpus atrovirens (dark green bulrush)
Scirpus cyperinus (Woolgrass)
Scirpus microcarpus (small-fruited bulrush)
Scoliopus bigelovii (California fetid adderstongue)
Scorzoneroides autumnalis (Autumn Hawkbit)
Scrophularia californica (California beeplant)
Scrophularia nodosa (Common Figwort)
Scutellaria drummondii (Drummond's skullcap)
Scutellaria galericulata (Marsh Skullcap)
Scutellaria integrifolia (Helmet skullcap)
Scutellaria lateriflora (side-flowering skullcap)
Scutellaria suffrutescens (Pink Skullcap)
Securigera varia (purple crownvetch)
Sedum acre (Biting Stonecrop)
Sedum anglicum (English Stonecrop)
Sedum ewersii (Pink Stonecrop)
Sedum kimnachii (Kimnach's Stonecrop)
Sedum oreganum (Oregon Stonecrop)
Sedum 'Purple Emperor' (Purple Emperor Stonecrop)
Sedum sarmentosum (Stringy Stonecrop)
Sedum sieboldii (October Daphne)
Sedum spathifolium 'Cape Blanco' (Cape Blanco sedum)
Sedum spectabile (sedum)
Sedum spectabile 'Autumn Joy' (Autumn Joy Stonecrop)
Sedum ternatum (woodland stonecrop)
Selaginella uliginosa (Swamp Spikemoss)
Sematophyllum homomallum (Bronze Moss)
Sempervivum arachnoideum (cobweb houseleek)
Senecio elegans (Red-purple Ragwort)
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)
Senegalia greggii (Catclaw Acacia)
Senega lutea (orange milkwort)
Senega paniculata (rootbeer plant)
Senna artemisioides (silver senna)
Senna bicapsularis (Butterfly Bush Senna)
Senna hebecarpa (American senna)
Senna lindheimeriana (Lindheimer's Senna)
Senna pendula (Christmas Senna)
Senna roemeriana (Two-leaved Senna)
Senna septemtrionalis (Arsenic Bush)
Sequoiadendron giganteum (giant sequoia)
Sequoiadendron giganteum 'Pendulum' (weeping Giant Sequoia)
Sequoia sempervirens (Coast Redwood)
Serenoa repens (saw palmetto)
Sesbania grandiflora (Hummingbird Tree)
Sesbania herbacea (bigpod sesbania)
Sesbania vesicaria (Bladder Pod)
Sesleria autumnalis (Autumn Moor Grass)
Sesleria spp. (moor grass)
Sesuvium portulacastrum (sea purslane)
Setaria faberi (giant foxtail)
Setaria parviflora (knotroot bristlegrass)
Setaria pumila (yellow foxtail)
Setaria viridis (Green Bristle Grass)
Sherardia arvensis (Field madder)
Shibataea kumasasa (Ruscus-leaved Bamboo)
Sibbaldiopsis tridentata (three-toothed cinquefoil)
Sicyos angulatus (Oneseed Bur Cucumber)
Sida abutilifolia (spreading sida)
Sida cordifolia (flannel weed)
Sida rhombifolia (Cuban jute)
Sideroxylon lanuginosum (Gum bumelia)
Sigesbeckia orientalis (Eastern St Paul's-wort)
Silene acaulis (Moss Campion)
Silene coronaria (Rose campion)
Silene dioica (red campion)
Silene flos-cuculi (ragged-robin)
Silene gallica (Small-flowered Catchfly)
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 integrifolium (prairie rosinweed)
Silphium laciniatum (compass plant)
Silphium perfoliatum (cup plant)
Silphium terebinthinaceum (prairie dock)
Silybum marianum (milk thistle)
Simmondsia chinensis (jojoba)
Sinapis alba (White Mustard)
Sison amomum (stone parsley)
Sisymbrium altissimum (Tall Tumblemustard)
Sisymbrium irio (London rocket)
Sisymbrium loeselii (False London-rocket)
Sisymbrium officinale (Hedge mustard)
Sisymbrium orientale (eastern rocket)
Sisyrinchium angustifolium (Blue-Eyed Grass)
Sisyrinchium bellum (western blue-eyed grass)
Sisyrinchium micranthum (Blue Pigroot)
Sisyrinchium pruinosum (Roadside Blue-eyed Grass)
Sisyrinchium striatum (pale yellow-eyed grass)
Sixalix atropurpurea (Sweet scabious)
Skimmia japonica (Japanese skimmia)
Smallanthus uvedalia (bear's foot)
Smilax auriculata (Earleaf Greenbrier)
Smilax australis (Austral Sarsaparilla)
Smilax bona-nox (saw greenbrier)
Smilax glauca (sawbrier)
Smilax glyciphylla (Sweet Sarsaparilla)
Smilax rotundifolia (roundleaf greenbrier)
Smilax smallii (Lanceleaf Greenbrier)
Smilax tamnoides (bristly greenbrier)
Smyrnium olusatrum (Alexanders)
Smyrnium perfoliatum (perfoliate alexanders)
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 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 villosa (Hairy Snowbell)
Soleirolia soleirolii (Baby's tears)
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 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)
Sonchus arvensis (marsh sow thistle)
Sonchus asper (prickly sow thistle)
Sonchus oleraceus (annual sow thistle)
Sophora japonica (Japanese Pagoda Tree)
Sorbus alnifolia (Korean Mountain Ash)
Sorbus americana (American mountain ash)
Sorbus aucuparia (European mountain ash)
Sorghastrum nutans (Indiangrass)
Sorghum halepense (Johnson grass)
Sowerbaea juncea (Rush Lily)
Sowerbaea laxiflora (Purple Tassels)
Sparganium erectum (Branched Bur-reed)
Spartina alterniflora (saltwater cordgrass)
Spartina anglica (English cordgrass)
Spartina bakeri (Sand Cordgrass)
Spartium junceum (Spanish Broom)
Spathiphyllum wallisii (Peace Lily)
Spergula arvensis (Corn spurrey)
Spergularia marina (Saltmarsh Sand Spurry)
Spergularia media (Greater Sea-spurry)
Spergularia rubra (Red Sand Spurrey)
Spergularia rupicola (Rock Sea-spurrey)
Spermacoce verticillata (shrubby false buttonweed)
Sphaeralcea ambigua (apricot globemallow)
Sphaeralcea coccinea (Scarlet Globemallow)
Sphaerolobium minus (globe-pea)
Sphaeropteris cooperi (Scaly Tree Fern)
Sphagneticola trilobata (Trailing Daisy)
Sphagnum capillifolium (Northern Peatmoss)
Sphagnum denticulatum (Cow-horn Bog-moss)
Sphagnum fallax (Flat-top Bogmoss)
Sphagnum palustre (Prairie Peatmoss)
Spigelia marilandica (Indian Pink)
Spinifex sericeus (Beach Spinifex)
Spinulum annotinum (interrupted clubmoss)
Spiraea alba (white meadowsweet)
Spiraea douglasii (western spirea)
Spiraea japonica 'Goldflame' (Goldflame spirea)
Spiraea japonica 'Little Princess' (Little Princess spirea)
Spiraea nipponica 'Snowmound' (snowmound spirea)
Spiraea thunbergii (Thunberg spirea)
Spiraea tomentosa (Steeplebush)
Spiraea × vanhouttei (Vanhoutte spirea)
Spiranthes australis (austral ladies'-tresses)
Spiranthes spiralis (Autumn Ladies' Tresses)
Spiranthes vernalis (Spring Ladies' Tresses)
Sporobolus alterniflorus (Saltmarsh Cordgrass)
Sporobolus anglicus (common cordgrass)
Sporobolus heterolepis (Prairie Dropseed)
Sporobolus wrightii (Giant Sacaton)
Sprengelia incarnata (Pink Swamp Heath)
Spyridium globulosum (basket bush)
Spyridium parvifolium (Australian dusty miller)
Stachys bullata (California Hedge Nettle)
Stachys byzantina (lamb's ears)
Stachys floridana (Florida Hedgenettle)
Stachys officinalis (wood betony)
Stachys palustris (Marsh Woundwort)
Stachys sylvatica (hedge woundwort)
Stackhousia monogyna (Creamy Candles)
Stackhousia viminea (Yellow Stackhousia)
Stanleya pinnata (Desert Prince's Plume)
Staphylea trifolia (American bladdernut)
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 conostephioides (Flame Heath)
Stenanthera pinifolia (pine heath)
Stenaria nigricans (diamond-flowers)
Stenocarpus sinuatus (Firewheel tree)
Stenotaphrum secundatum (St. Augustine Grass)
Stephania japonica (Tapevine)
Stephanomeria diegensis (San Diego Wirelettuce)
Stephanomeria pauciflora (Brownplume Wirelettuce)
Stevia rebaudiana (Stevia)
Stewartia monadelpha (tall stewartia)
Stewartia pseudocamellia (Japanese stewartia)
Sticherus flabellatus (Shiny fan fern)
Stipa gigantea (giant feather grass)
Strelitzia nicolai (Giant Bird of Paradise)
Strelitzia reginae (Bird of Paradise)
Streptopus amplexifolius (white twisted-stalk)
Strophostyles helvola (trailing fuzzy-bean)
Struthiopteris spicant (deer fern)
Stylidium armeria (Thrift-leaved Triggerplant)
Stylidium graminifolium (Grass Triggerplant)
Stypandra glauca (nodding blue lily)
Styphelia ericoides (Bearded Heath)
Styphelia humifusa (Cranberry Heath)
Styphelia sieberi (Prickly Beard-heath)
Styphnolobium affine (Eve's Necklacepod)
Styphnolobium japonicum (Japanese pagoda tree)
Styrax japonicus (Japanese snowdrop tree)
Styrax obassia (fragrant snowbell)
Suaeda australis (Austral Seablite)
Suaeda maritima (Herbaceous Seepweed)
Suaeda vera (Shrubby Seablite)
Succisa pratensis (Devil's-bit Scabious)
Swainsona formosa (Sturt's Desert Pea)
Swainsona galegifolia (Smooth Darling Pea)
Swainsona lessertiifolia (coast Swainson-pea)
Syagrus romanzoffiana (Queen Palm)
Symphoricarpos albus (snowberry)
Symphoricarpos occidentalis (Western Snowberry)
Symphoricarpos orbiculatus (coralberry)
Symphoricarpos rotundifolius (Roundleaf Snowberry)
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 subspicatum (Douglas' aster)
Symphytum grandiflorum (Creeping Comfrey)
Symphytum officinale (common comfrey)
Symphytum orientale (Soft Comfrey)
Symphytum tuberosum (Tuberous Comfrey)
Symplocarpus foetidus (Eastern Skunk Cabbage)
Symplocos tinctoria (Sweetleaf)
Syncarpia glomulifera (Turpentine)
Syngonium podophyllum (Arrowhead Plant)
Synoum glandulosum (scentless rosewood)
Synsepalum dulcificum (Miracle Fruit)
Syntrichia montana (Intermediate Screw-moss)
Syntrichia ruraliformis (Sand-hill Screw-moss)
Syntrichia ruralis (Star Moss)
Syringa pubescens ssp. patula 'Miss Kim' (Miss Kim lilac)
Syringa reticulata (Japanese Tree Lilac)
Syringa vulgaris (lilac, common lilac)
Syzygium australe (scrub cherry)
Syzygium floribundum (weeping lilli pilli)
Syzygium oleosum (Blue Lilly Pilly)
Syzygium smithii (Lilly Pilly)
Tabernaemontana pandacaqui (Banana Bush)
Tagetes erecta (Mexican Marigold)
Tagetes minuta (wild marigold)
Tamala palustris (swamp redbay)
Tamarix gallica (French tamarisk)
Tamarix ramosissima (saltcedar)
Tanacetum parthenium (feverfew)
Tanacetum vulgare (common tansy)
Taraxacum erythrospermum (red-seeded dandelion)
Taraxacum officinale (Dandelion Greens)
Taraxia ovata (Sun Cup)
Tasmannia insipida (Brush Pepperbush)
Tasmannia lanceolata (Mountain Pepper)
Taxodium ascendens (pondcypress)
Taxodium distichum (bald cypress)
Taxus baccata 'Fastigiata' (Irish Yew)
Taxus baccata 'Fastigiata Aurea' (Golden Irish Yew)
Taxus baccata 'Repandens' (Spreading English Yew)
Taxus brevifolia (Pacific yew)
Taxus cuspidata (Japanese yew)
Taxus cuspidata 'Nana' (Dwarf Japanese yew)
Taxus × media 'Hicksii' (Hicks yew)
Tecomaria capensis (Cape Honeysuckle)
Tellima grandiflora (Fringecup)
Telopea speciosissima (Waratah)
Telopea truncata (Tasmanian Waratah)
Templetonia retusa (Cockies Tongue)
Tephrosia virginiana (goat's rue)
Terminalia catappa (Sea Almond)
Tetragonia implexicoma (bower spinach)
Tetragonia tetragonoides (New Zealand Spinach)
Tetraneuris linearifolia (Fineleaf Four-nerved Daisy)
Tetraneuris scaposa (Stemmy Four-nerved Daisy)
Tetrarrhena juncea (Forest Wire-grass)
Tetrastigma nitens (Native Grape)
Tetratheca ciliata (Pink-bells)
Tetratheca pilosa (Hairy Pink-bells)
Tetratheca thymifolia (Thyme Pink-bells)
Teucrium canadense (American germander)
Teucrium chamaedrys (Wall Germander)
Teucrium scorodonia (woodland germander)
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 minus (Lesser Meadow-rue)
Thalictrum pubescens (tall meadow-rue)
Thalictrum thalictroides (rue anemone)
Thamnobryum alopecurum (Fox-tail Feather-moss)
Thaumatophyllum bipinnatifidum (Split-Leaf Philodendron)
Thelesperma filifolium (stiff greenthread)
Thelionema caespitosum (Tufted Blue Lily)
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 palustris (marsh fern)
Themeda triandra (Kangaroo Grass)
Thlaspi arvense (field penny-cress)
Thomasia petalocalyx (paper flower)
Threlkeldia diffusa (Coast Bonefruit)
Thuidiopsis sparsa (Sparse Fern Moss)
Thuidium delicatulum (delicate fern moss)
Thuidium tamariscinum (Common Tamarisk-moss)
Thuja occidentalis 'Smaragd' (Emerald Green Arborvitae)
Thuja plicata (western red cedar)
Thuja plicata 'Zebrina' (golden western red cedar)
Thujopsis dolabrata (Japanese false arborvitae)
Thujopsis dolabrata 'Variegata' (variegated Japanese false arborvitae)
Thunbergia grandiflora (Sky Vine)
Thymophylla pentachaeta (Parralena)
Thymus praecox (Mother of Thyme)
Thymus pseudolanuginosus (Woolly Thyme)
Thymus serpyllum (Wild Thyme)
Thysanotus patersonii (Twining Fringe-lily)
Thysanotus tuberosus (Common Fringe-lily)
Tiarella cordifolia (Foamflower)
Tiarella stolonifera (Creeping Foamflower)
Tiarella trifoliata (foamflower)
Tibouchina urvilleana (Tibouchina Princess Flower)
Tilia americana (basswood)
Tilia cordata (little‑leaf linden)
Tilia platyphyllos (Bigleaf Linden)
Tillandsia fasciculata (cardinal airplant)
Tillandsia recurvata (ballmoss)
Tillandsia usneoides (Spanish moss)
Tipularia discolor (crane-fly orchid)
Todea barbara (king fern)
Tolmiea menziesii (piggy-back plant)
Toona ciliata (Australian Red Cedar)
Torilis arvensis (common hedge parsley)
Torilis japonica (upright hedge-parsley)
Torminalis glaberrima (Wild Service-tree)
Tortula muralis (Wall Screw-moss)
Toxicodendron diversilobum (Pacific poison oak)
Toxicodendron radicans (Poison Ivy)
Toxicodendron rydbergii (western poison ivy)
Toxicoscordion fremontii (Fremont's Death Camas)
Toxicoscordion venenosum (Meadow Deathcamas)
Trachelospermum asiaticum (Asiatic Jasmine)
Trachelospermum jasminoides (star jasmine)
Trachycarpus fortunei (windmill palm)
Trachymene incisa (Australian parsnip)
Trachystemon orientalis (giant borage)
Tradescantia fluminensis (small-leaf spiderwort)
Tradescantia occidentalis (Western Spiderwort)
Tradescantia ohiensis (Ohio spiderwort)
Tradescantia pallida (Purple Heart)
Tradescantia spathacea (Moses-in-the-Cradle)
Tradescantia virginiana (Virginia spiderwort)
Tradescantia zebrina (Inch Plant)
Tragopogon dubius (Yellow Salsify)
Tragopogon porrifolius (purple salsify)
Tragopogon pratensis (meadow salsify)
Trema tomentosum (Nettle Tree)
Triadica sebifera (Chinese Tallow)
Tribulus terrestris (puncture vine)
Trichodesma zeylanicum (camel bush)
Trichomanes venosum (veined bristle-fern)
Trichophorum cespitosum (Tufted Bulrush)
Trichostema dichotomum (Blue Curls)
Trichostema lanceolatum (Vinegar Weed)
Tricoryne elatior (yellow rush-lily)
Tridax procumbens (Tridax Daisy)
Tridens flavus (purpletop tridens)
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 maritima (common arrowgrass)
Trillium catesbaei (bashful wakerobin)
Trillium chloropetalum (giant trillium)
Trillium cuneatum (Little Sweet Betsy)
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)
Triodanis biflora (Venus's looking-glass)
Triodanis perfoliata (clasping Venus's looking glass)
Tripladenia cunninghamii (kreysigia)
Tripleurospermum inodorum (scentless mayweed)
Tripleurospermum maritimum (Sea Mayweed)
Tripolium pannonicum (Sea Aster)
Tripsacum dactyloides (eastern gamagrass)
Triquetrella papillata
Tristaniopsis laurina (Water Gum)
Triteleia ixioides (Prettyface)
Triteleia laxa (Ithuriel's Spear)
Triticum aestivum (Bread Wheat)
Trochocarpa laurina (Tree Heath)
Tropaeolum majus (garden nasturtium)
Tsuga canadensis (eastern hemlock)
Tsuga canadensis 'Pendula' (Weeping Canadian Hemlock)
Tsuga heterophylla (western hemlock)
Tsuga mertensiana (mountain hemlock)
Tulipa (tulips)
Tulipa gesneriana (Garden Tulip)
Tulipa praestans (excellent tulip)
Tussilago farfara (colt's-foot)
Typha angustifolia (slender-leaved cattail)
Typha domingensis (southern cattail)
Typha latifolia (common cat-tail)
Typha orientalis (Oriental Cattail)
Ulex gallii (Western Gorse)
Ulex minor (Dwarf Gorse)
Ulmus alata (Winged Elm)
Ulmus americana (American Elm)
Ulmus crassifolia (Cedar Elm)
Ulmus glabra 'Camperdownii' (Camperdown elm)
Ulmus minor (Field Elm)
Ulmus procera (English elm)
Ulmus pumila (Siberian elm)
Ulmus rubra (slippery elm)
Ulota crispa (crisped pincushion)
Ulva intestinalis (Gutweed)
Ulva lactuca (Broadleaf Sea Lettuce)
Umbellularia californica (California bay)
Umbilicus rupestris (Wall Pennywort)
Ungnadia speciosa (Mexican buckeye)
Uniola paniculata (sea oats)
Urena lobata (Caesar weed)
Uropappus lindleyi (silverpuffs)
Urtica dioica (stinging nettle)
Urtica gracilis (slender stinging nettle)
Urtica incisa (Scrub Nettle)
Urtica urens (small nettle)
Utricularia dichotoma (fairy aprons)
Uvularia grandiflora (largeflower bellwort)
Uvularia perfoliata (Perfoliate Bellwort)
Uvularia sessilifolia (sessile bellwort)
Vaccinium angustifolium (lowbush blueberry)
Vaccinium arboreum (sparkleberry)
Vaccinium corymbosum (blueberry)
Vaccinium macrocarpon (American Cranberry)
Vaccinium myrsinites (Shiny blueberry)
Vaccinium myrtillus (common bilberry)
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 farnesiana (Sweet acacia)
Valeriana dioica (Marsh Valerian)
Valeriana officinalis (common valerian)
Valerianella locusta (common cornsalad)
Valerianella radiata (beaked cornsalad)
Vancouveria hexandra (inside-out flower)
Vanilla planifolia (Vanilla Orchid)
Veratrum californicum (Corn Lily)
Veratrum viride (green false hellebore)
Verbascum blattaria (moth mullein)
Verbascum nigrum (Dark Mullein)
Verbascum olympicum (Olympic mullein)
Verbascum roripifolium (Watercress-Leaved Mullein)
Verbascum thapsus (common mullein)
Verbascum virgatum (Wand Mullein)
Verbena bonariensis (tall verbena, Brazilian verbena)
Verbena bracteata (Bigbract Verbena)
Verbena brasiliensis (Brazilian 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 alternifolia (Wingstem)
Verbesina encelioides (cowpen daisy)
Verbesina occidentalis (Yellow Crownbeard)
Verbesina virginica (frostweed)
Vernonia baldwinii (Western Ironweed)
Vernonia gigantea (Tall Ironweed)
Vernonia noveboracensis (New York Ironweed)
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 gracilis (Slender Speedwell)
Veronica hederifolia (Ivy-leaved Speedwell)
Veronica montana (Wood Speedwell)
Veronica odora (boxleaf hebe)
Veronica officinalis (heath 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 ssp. (hebe)
Veronica sublobata (Pink Ivy-leaved Speedwell)
Veronica topiaria (Topiary Hebe)
Vertebrata lanosa (Wrack Siphon Weed)
Viburnum acerifolium (mapleleaf viburnum)
Viburnum × bodnantense 'Dawn' (Dawn viburnum)
Viburnum × burkwoodii (Burkwood viburnum)
Viburnum carlesii (Korean spice viburnum)
Viburnum cassinoides (northern wild raisin)
Viburnum davidii (David viburnum)
Viburnum dentatum (southern arrowwood)
Viburnum dilatatum (linden 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 rhytidophyllum (leatherleaf viburnum)
Viburnum rufidulum (Rusty Blackhaw)
Viburnum tinus (Viburnum tinus)
Viburnum x burkwoodii (Burkwood Viburnum)
Vicia cracca (tufted vetch)
Vicia ludoviciana (slender vetch)
Vicia sepium (Bush Vetch)
Vicia tetrasperma (Lentil Vetch)
Vicia villosa (woolly vetch)
Vigna luteola (Wild Cowpea)
Viminaria juncea (native broom)
Vinca difformis (Intermediate Periwinkle)
Vinca major 'Variegata' (variegated vinca major)
Vinca minor (common periwinkle)
Vinealobryum insulanum (Cylindric Beard-moss)
Viola arvensis (European field pansy)
Viola banksii (Banks' Violet)
Viola betonicifolia (Mountain Violet)
Viola blanda (sweet white violet)
Viola canadensis (Canada Violet)
Viola cucullata (marsh blue violet)
Viola eriocarpa (Smooth Yellow Violet)
Viola hastata (Halberd-leaved violet)
Viola hederacea (Ivy Leaved Violet)
Viola hirta (Hairy Violet)
Viola lutea (Mountain Pansy)
Viola odorata (Sweet violet)
Viola palmata (three-lobed violet)
Viola pedata (bird's foot violet)
Viola pedunculata (California Golden 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 striata (cream violet)
Viola tricolor (Wild Pansy)
Viola × wittrockiana (pansy)
Viscum album (European mistletoe)
Vitex agnus-castus (chaste tree)
Vitis aestivalis (summer grape)
Vitis californica (California wild grape)
Vitis labrusca (fox grape)
Vitis mustangensis (mustang grape)
Vitis riparia (riverbank grape)
Vitis rotundifolia (muscadine)
Vitis vinifera (grape)
Vitis vulpina (frost grape)
Vittadinia cuneata (Purple Fuzzweed)
Vittadinia gracilis (Purple Fuzzweed)
Wahlenbergia gracilis (Australian Bluebell)
Wahlenbergia stricta (Australian bluebell)
Washingtonia filifera (California fan palm)
Washingtonia robusta (Mexican Fan Palm)
Watsonia meriana (Bulbil Bugle-lily)
Wedelia hispida (Texas creeping-oxeye)
Weigela florida (weigela)
Weigela florida 'Variegata' (variegated weigela)
Westringia eremicola (slender westringia)
Westringia fruticosa (Coastal Rosemary)
Wikstroemia indica (Bootlace Plant)
Wilkiea hugeliana (Common Wilkiea)
Wisteria floribunda (Japanese wisteria)
Wisteria sinensis (Chinese wisteria)
Wollemia nobilis (Wollemi pine)
Woodsia obtusa (blunt woodsia)
Woodwardia areolata (netted chain fern)
Woodwardia virginica (Virginia chainfern)
Woollsia pungens (Snow Wreath)
Wurmbea dioica (Early Nancy)
Xanthisma spinulosum (Spiny Goldenweed)
Xanthium strumarium (rough cocklebur)
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 pilosa (Woolly Xanthosia)
Xanthostemon chrysanthus (Golden Penda)
Xerochrysum bracteatum (Golden Everlasting)
Xerochrysum viscosum (sticky everlasting)
Xylococcus bicolor (mission manzanita)
Xylomelum pyriforme (Woody Pear)
Xylorhiza orcuttii (Orcutt's Woodyaster)
Youngia japonica (Oriental false hawksbeard)
Yucca baccata (Banana Yucca)
Yucca brevifolia (Western Joshua Tree)
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 furfuracea (Cardboard Palm Tree)
Zamia integrifolia (Coontie Palm)
Zamioculcas zamiifolia (ZZ Plant)
Zantedeschia aethiopica (White Calla Lily)
Zanthoxylum americanum (northern prickly ash)
Zanthoxylum clava-herculis (Hercules' club)
Zelkova serrata (sawleaf zelkova)
Zeltnera venusta (California Centaury)
Zephyranthes atamasco (Atamasco Lily)
Zephyranthes chlorosolen (Brazos rain-lily)
Zephyranthes drummondii (Drummond's rain lily)
Zieria smithii (Sandfly Zieria)
Zingiber officinale (Ginger)
Zinnia elegans (Elegant Zinnia)
Zizia aurea (Golden Alexanders)
Zoysia japonica (Zoysia Grass)