Part of speech: Noun
any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers
Part of speech: Noun
rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers
Example: sometimes placed in genus Eupatorium
Mistflower, Ageratum, Mist-flower, Conoclinium coelestinum, Eupatorium coelestinum