Herbs perennial, 10-60 cm tall. Stem much branched, puberulent or glabrescent. Leaves paripinnate; stipules semihastate, 3-6 mm; leaflets 4-8-paired, linear to oblong, 10-20 × ca. 3 mm, abaxially pilose, apex mucronate; lateral veins very obvious; tendril unbranched or branched. Raceme longer than leaf, 14-or 15-flowered; bracts absent. Calyx campanulate, unequally toothed. Corolla purple or blue-purple, 13-17 mm; standard oblong-obovate, constricted at middle, longer than wings and keel. Ovary linear. Legume flat, 30-35 mm, apex beaked. Seeds dark brown, oblate-spheroid. Fl. and fr. Jun-Sep. 2n = 12, 24.
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