Ageratina altissima

White snakeroot
Conservation status
	; Secure (NatureServe)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Ageratina
Species:	A. altissima
Binomial name
	Ageratina altissima; (L.) King & H.E.Robins.
	Natural range in North America
Synonyms
	List Ageratina ageratoides (L.f.) Spach; Ageratina luciae-brauniae (Fernald) R.M.King & H.Rob.; Ageratum altissimum L.; Batschia nivea Moench; Eupatorium aboriginum Greene; Eupatorium ageratoides L.f.; Eupatorium angustatum: (A.Gray) Greene; Eupatorium boreale Greene; Eupatorium cordatum var. fraseri (Poir.) DC.; Eupatorium deltoides E.L.Braun 1940, illegitimate homonym not Eupatorium deltoideum Jacq. 1798; Eupatorium eurybiaefolium Greene; Eupatorium frasieri Poir.; Eupatorium luciae-brauniae Fernald; Eupatorium roanense Small; Eupatorium rugosum Houtt.; Eupatorium urticifolium Reichard; ;

Ageratina altissima, also known as white snakeroot, richweed, or white sanicle, is a poisonous perennial herb in the family Asteraceae, native to eastern and central North America. An older binomial name for this species is Eupatorium rugosum, but the genus Eupatorium has undergone taxonomic revision by botanists, and some species once included in it have been moved to other genera.

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