Herbs perennial, 20-40 cm tall, pilose. Stem much branched, puberulent. Leaves paripinnate, 2-6 cm; stipules small, bifid; leaflets 5-8-paired, narrowly oblong or narrowly ovate-elliptic, 5-17 × 3-5 mm, subleathery, abaxially hairy along midrib, apex truncate or rounded, mucronate; lateral veins 8-15-paired; petiolules ca. 1 mm; tendril 2-or 3-branched. Raceme subequaling leaf, 4-7 cm, sparsely 7-10-flowered; pedicels hairy. Calyx obliquely campanulate, ca. 4 mm, pilose. Corolla purple or blue, 10-11 mm; standard oblong or narrowly obovate, ca. 10 × 4 mm, slightly longer than wings and shorter than keel, apex retuse. Ovary glabrous; ovules 4 or 5. Legume oblong, ca. 25 × 7 mm, both ends acute. Seeds 2 or 3. Fl. Apr-May, fr. Jul-Oct.
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