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white snakeroot, white sanicle, Ageratina altissima, Eupatorium rugosum | American herb having flat-topped clusters of small white flower heads; reputedly a cause of trembles and milk sickness; 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 altissima, Eupatorium rugosum❳ |