What is "white snakeroot"

n. American herb having flat-topped clusters of small white flower heads; reputedly a cause of trembles and milk sickness; sometimes placed in genus Eupatorium [syn: white sanicle, Ageratina altissima, Eupatorium rugosum]

White snakeroot is a common name for several plants and may refer to:

• Ageratina altissima, native to eastern North America
• Ayapana triplinervis, native to the tropical Americas