"Glabrous rhizomatous perennial, to 8 dm; stipules semicordate, 1.5–3 cm, the broadly rounded basal lobe often irregularly toothed; lfls 3–5 pairs, thin, elliptic to lance-ovate or obovate, 2.5–5 cm, racemes shorter than the subtending lf, with 5–10 ochroleucous fls 12–18 mm; cal irregular, the upper lobes triangular, a fourth to half as long as the lower, the lateral lobes broadest distinctly above the base; 2n=14. Dry upland woods and thickets; Vt. to Man. and nw. Can., s. to Pa., Ill., Io., and Wash. May–July."