Herbs perennial, 20-80 cm tall. Stem much branched. Leaves paripinnate, 5-9 cm; stipules semihastate, bifid, margin toothed; leaflets 3-7-paired, abaxially brownish, narrowly elliptic-oblong, 12-40 × 5-13 mm, leathery, adaxially densely villous or both surfaces glabrous, apex rounded or acuminate, mucronate; lateral veins densely 10-13-paired; tendril unbranched or branched. Raceme curved, to 20 cm, obviously longer than leaf, sparsely 6-16(-20)-flowered. Calyx campanulate, unequally toothed, very sparsely pilose; teeth narrowly oblong, apex acuminate. Corolla purple or purple-red, 7-8(-14) mm, strongly bent upward at middle forming a 90° angle; standard 10-11 × ca. 6 mm, longer than wings; wings longer than keel. Ovary stalked, linear; ovules 3 or 4. Legume dark brown or reddish brown, rhomboid or oblong, 20-25 mm, glabrous. Seeds 1-4, black, oblong-cuboid, 4-5 mm. Fl. Apr-Jun, fr. Jun-Sep.
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