Herbs perennial, 60-80 cm tall, hairy. Stem few branched. Leaves paripinnate, 7-11 cm; stipules hastate, bifid in distal part, margin 3-or 4-toothed; leaflets 3-7-paired, oblong to elliptic, 13-23 × 8-10 mm, both surfaces hairy when young, apex truncate, 3-or 4-toothed, and mucronate; lateral veins dense but not obvious; tendril 2-or 3-branched. Raceme obviously longer than leaf, 15-20-flowered. Calyx obliquely campanulate, 5-7 mm, unequally toothed, villous. Corolla blue; standard oblong, 10-12 × 5-6 mm, subequaling wings and longer than keel. Ovary shortly stalked, linear, ca. 5 mm; ovules ca. 6. Legume brown, linear, 20-25 × ca. 6 mm, subleathery Seeds 2 or 3, terete. Fl. May-Jun, fr. Jul-Aug.
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