Erect, glaucous biennial 3-8(-10) dm, much-branched at least above; lower lvs petioled, the upper subsessile; fls in small panicles at the ends of the branches; bracts minute, lanceolate, cor (10-)12-17 mm, incl. the 2.5-5 mm spur; sep broadly ovate, 2-4 mm; fr ±erect, 2.5-4(-5) cm; seeds ca 1 mm wide, with an obtuse margin; 2n=16. Dry or rocky woods; Nf. to Alas., s. to N.Y., Pa., n. Ind., Minn., Mont., and B.C., and along the mts. to Ga. May-Sept.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.