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nounrhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatoriumtype of:
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nounany plant of the genus Ageratum having opposite leaves and small heads of blue or white flowerstype of:
Definition that contains ageratum
- ageratum any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers
- lonas one species: yellow ageratum
- genus lonas one species: yellow ageratum