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A poisonous eastern North American plant (Ageratina altissima) in the composite family, having opposite, heart-shaped leaves and flat-topped clusters of small white flower heads.
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|Noun||1.||white snakeroot - American herb having flat-topped clusters of small white flower heads; reputedly a cause of trembles and milk sickness; sometimes placed in genus Eupatorium|
Ageratina, genus Ageratina - annual to perennial herbs or shrubs of eastern United States and Central and South America