Herbs perennial, 40-100 cm tall. Stem puberulent or glabrescent. Leaves paripinnate, 5-8 cm; stipules semihastate, obliquely ovate, or oblong, 8-12(-16) × 10-13 mm, margin entire or toothed at base; leaflets (2 or)3(or 4)-paired, lanceolate or ovate-lanceolate, 25-80 × 10-30 mm, abaxially hairy along midrib, apex acuminate or long caudate; tendril absent, replaced by a mucro. Raceme usually 2-or 3-branched, 4-5 cm, shorter than leaf (rarely caespitose or capitate on a much-reduced peduncle), sparsely 4-9-flowered. Calyx obliquely campanulate. Corolla blue, blue-purple, or purple-red, rarely white; standard oblong or long obovate, constricted at middle, 11-14(-18) mm, subequaling wings and keel, apex retuse. Ovary shortly stalked, linear; ovules 5 or 6. Legume oblong-rhomboid, 25-50 × 5-7 mm, both ends acuminate. Seeds 1-4, elliptic. Fl. and fr. Jun-Sep. 2n = 12, 14.
Home