Hypertext Webster Gateway: "Ageratum"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Ageratum \A*ger"a*tum\, n. [NL., fr. Gr. ? a sort of plant; 'a
priv. + ? old age.] (Bot.)
A genus of plants, one species of which ({A. Mexicanum}) has
lavender-blue flowers in dense clusters.
From WordNet (r) 1.7 (wn)
ageratum
n 1: rhizomatous plant of central and southeastern United States
and West Indies having large showy heads of clear blue
flowers; sometimes placed in genus Eupatorium [syn: {mistflower},
{Conoclinium coelestinum}, {Eupatorium coelestinum}]
2: any plant of the genus Ageratum having opposite leaves and
small heads of blue or white flowers
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