Fibrous-rooted perennial from long rhizomes; stems 3-5 dm, the upper part, infl, and cal glabrous or with scattered stout spreading hairs to 1 mm; cauline lvs usually overtopping the cymes, 1-2 dm wide and nearly as long, cordate at base, palmately 5-9-lobed, seldom to beyond the middle, the lobes acuminate, coarsely toothed or incised; cal rarely with minute appendages at the sinuses; cor white to pink-purple, 8-12 mm, the lobes shorter than the tube; stamens exsert 3-6 mm; style exsert 4-5 mm; 2n=18. Rich moist woods; s. Vt. and w. Mass. to Md. and in the mts. to Ga., w. to Wis., Ill., Mo. and n. Ark. May, June.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.