Hedysarum alpinum L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stems mostly several, 3–7 dm; stipules connate opposite the lf-base; lfls 15–21, oblong to elliptic or lanceolate, those of the principal lvs 15–30 × 5–10 mm; racemes secund, 5–10 cm, on peduncles 8–15 cm; fls 12–16 mm, purple, seldom white; keel surpassing the standard and wings; fr with (1)2–5 flat joints each 5–9 × 3.5–6 mm; 2n=14. River-banks, hills, and ledges, in moist soil; Siberia and boreal N. Amer., s. to Me., n. Vt., n. Mich., Man., Wyo., and B.C. June–Aug. Our plants are var. americanum Michx. (H. boreale, misapplied)