caeruleum
/see-ROO-lee-um/🏷️ Taxonomy● Basic
A colour epithet marking flowers or foliage of a clear sky-blue rather than the violet and purple shades often loosely called blue in gardens. This is the neuter form, paired with neuter genus names. Appears as caeruleus (masculine), caerulea (feminine), or caeruleum (neuter).
Etymology
From Latin caeruleus, meaning "sky-blue," from caelum (sky, heaven).
Example
“Polemonium caeruleum 'Blanjou' (Blanjou Jacob's Ladder) takes the neuter ending to agree with the neuter genus name Polemonium.”