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Any plant of the genus Ageratum, of the aster family (Asteraceae), native to tropical South America. Ageratum have toothed, oval leaves that are opposite each other on the stem; compact clusters of blue, pink, lilac, or white flowers; and small, dry fruits. Dwarf varieties are used as edging plants. Some ageratum are variously known as flossflower and pussyfoot.
This entry comes from Encyclopædia Britannica Concise. For the full entry on ageratum, visit Britannica.com.