Pls glabrous, 1-2 m; terminal lfl reniform in outline, to 2 dm wide, deeply cleft into 5-9 lanceolate or oblong, serrate segments; lateral lfls 2-5 pairs, sessile, to 1 dm, shallowly to deeply 3-5-lobed; infl 1-2 dm wide; sep broadly round- ovate; pet mostly 5, rich pink, 2-4 mm; frs glabrous, erect, oblong, 6-8 mm. Low woods and wet prairies or meadows; N.Y. to Minn., s. to N.C. and Ky., and sometimes escaped from cult. elsewhere. June, July.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.