White Snakeroot: Eupatorium rugosum: Asteraceae 
White Snakeroot © RSWacha, 1998
Description:
Each flowering head is formed by a cluster of about 25 tiny, white, disc flowers. Ray flowers are absent. Involucral bracts are long, lance-shaped, and hairy. Flowering heads are grouped in a highly-branched inflorescence. Leaves occur in pairs on the stem and attach by a conspicuous petiole. Leaves are ovate, and have well defined teeth that point toward the leaf tip. The leaf is rounded at its base, and slightly re-curved toward the tip. Large leaves are up to 5 cm wide by 15 cm long, or more. Stems typically lack hairs except near the inflorescence. In woodlands in September and October. Native to N. A.