"Rhizomatous, 3–8 dm, usually without tufts of basal lvs; stem puberulent above; lvs thick and firm, scabrous above, ± densely spreading-hairy across the surface beneath, serrate with mucronulate teeth, the lower petiolate, ovate (often narrowly so), acuminate, with cordate base, 6–15 × 3–8 cm, often deciduous, the middle and upper ones rather gradually reduced, often with winged laciniate petiole, eventually sessile and lanceolate or lance-elliptic; infl corymbiform, flat or round-topped, with few and rather leafy bracts; invol 7–10 mm, its bracts firm, well imbricate, often puberulent, mostly obtuse or rounded, very shortly green-tipped, the outer 1–2 mm wide and not over 2.5 times as long; rays 9–18, white, or becoming lilac or rosy in age, rarely so when young, 8–15 mm; 2n=18. Woods; s. Mich. and s. Wis. to s. Ind. and s. Mo. and nw. Ark."