ageratina : Idioms & Phrases
ageratina altissima
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noun American herb having flat-topped clusters of small white flower heads; reputedly a cause of trembles and milk sickness; sometimes placed in genus Eupatorium
white sanicle; white snakeroot; Eupatorium rugosum.
WordNet
genus ageratina
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noun annual to perennial herbs or shrubs of eastern United States and Central and South America
Ageratina.