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The Collaborative International Dictionary
Ageratum

Ageratum \A*ger"a*tum\ ([.a]*j[e^]r"[.a]*t[u^]m or [a^]j`[~e]r*[=a]"t[u^]m), prop. n. [NL., fr. Gr. 'agh`raton a sort of plant; 'a priv. + gh`ras old age.] (Bot.) A genus of plants, one species of which ( Ageratum Mexicanum) has lavender-blue flowers in dense clusters.

Wiktionary
ageratum

n. (context uncountable English) Any of the genus (taxlink Ageratum genus noshow=1) of tropical American herbs, annuals and perennials, from the sunflower family Asteraceae, tribe Eupatorieae; they are sometimes used in floral displays.

WordNet
ageratum
  1. n. 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, mist-flower, Conoclinium coelestinum, Eupatorium coelestinum]

  2. any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers

Wikipedia
Ageratum

Ageratum , (whiteweed in the USA), is a genus of 40 to 60 tropical and warm temperate flowering annuals and perennials from the family Asteraceae, tribe Eupatorieae. Most species are native to Central America and Mexico but four are native to the United States.

They form tussocks or small hills. They grow to a height of 30 in. The opposite leaves are cordate or oval, hairy or tomentose. The margins are slightly toothed or serrate. The leaves form compact clusters.

The fluffy flowers are lavender-blue, pink, lilac, or white; and spread in small compound umbels. They give small, dry fruits.

Usage examples of "ageratum".

King spat into a bunch of ageratum, just budding into a fuzzy blue blossom.

The moss-green slope is clouded blue with ageratum and wreathed with small white roses, golden-eyed--common weeds of a glorious land.

Red geraniums, white impatiens, and purple ageratum formed a patriotic border around the base of the tent platform.

At the edge of the woods, the tall stems of goldenrod, low masses of blue ageratum, black-eyed Susans, and lavender asters, all tangled with binding vines of pink morning glory just closing its flowers.

They helped carry things up a sidewalk bordered with a purple fringe of ageratums into the small house behind the parsonage.