ageratum
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, mist-flower, Conoclinium coelestinum, Eupatorium coelestinum • Hypernyms: flower • Member Holonyms: Conoclinium, genus Conoclinium 2. any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers • Hypernyms: flower • Hyponyms: common ageratum, Ageratum houstonianum • Member Holonyms: genus Ageratum
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