white snakeroot, North American woods perennial (Eupatorium urticifolium) of the family Asteraceae (aster family), having a flat-topped cluster of small white flowers. It is of the same genus as the boneset and joe-pye weed. The herbage contains tremetol, a toxic principle causing “milk sickness,” or milk fever. White snakeroot is classified in the division Magnoliophyta, class Magnoliopsida, order Asterales, family Asteraceae.
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