Plants relatively robust. Leaves: proximal 80-300 × 40-100 mm, sharply serrate; distal relatively few, gradually reduced distally, margins serrate. Flowering Aug-Sep-(Oct). Moist soils, swamp margins, boggy ground, wet meadows, roadside ditches, seeps, edges of wet woods; 0-1800+ m; Ala., Conn., Del., Ga., Ill., Ind., Iowa, Ky., Md., Mass., Mich., Miss., Mo., N.H., N.J., N.Y., N.C., Ohio., Pa., S.C., Tenn., Vt., Va., W.Va., Wis.