File:Ageratina altissima roanensis drawing.png

Ageratina altissima (L.) King & H.E. Robins. var. roanensis (Small) Clewell & Woot. Syn.: Eupatorium urticifolium Reichard. White Snakeroot. Drawing.

Illustrations from N.L. Britton & A. Brown (1913): Illustrated Flora of the Northern States and Canada.