Herbs perennial, 50-100 cm tall. Stem erect, white puberulent. Leaves paripinnate, 13-14 cm; stipules semihastate, bifid; leaflets 6-or 7-paired, oblong-ovate, 25-45 × 5-8 mm, apex obtuse or acuminate, mucronate; lateral veins not obvious; tendril 2-or 3-branched. Raceme ca. 15 cm, slightly longer than leaf, sparsely ca. 15-flowered. Calyx campanulate, hairy outside. Corolla blue-purple; standard violin-shaped, 11-12 mm, subequaling wings and longer than keel, limb (distal part) of standard subequaling claw (proximal part). Ovary fusiform, glabrescent; ovules ca. 8. Legume not seen. Fl. Jun-Sep.
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