Eupatorium rotundifolium L.

Stems 3–15 dm, mostly 1–2 from a short rhizome or crown; herbage pubescent throughout with spreading, usually short and soft hairs, commonly atomiferous-glandular as well; lvs opposite, or the upper seldom alternate, sessile or subsessile, ovate (mostly broadly so) to subrotund, evenly toothed except in var. cordigerum, broad-based and distinctly trinerved or triplinerved, 2–12 × 1–6 cm; invol 4.5–6.5 mm, its bracts imbricate, sharply acute to obtuse, evidently villous-puberulent and often also atomiferous-glandular; fls 5 (to 7 in var. ovatum), white; 2n=20, 30, 40. Woods, in dry or seldom wet soil; Me. to Fla., w. to s. O., e. Ky., Tenn., Okla., and Tex. July–Sept. Sp. here considered to consist of 3 vars.