Herbs perennial, 60-120 cm tall. Stem slender, glabrous or pilose. Leaves paripinnate, 5-11 cm; stipules hastate to lanceolate or elliptic, 3-7 × 1-5 mm; leaflets 8-11-paired, narrowly oblong or narrowly lanceolate, 12-27 × 3-6 mm, glabrous or hairy, apex acuminate, mucronate; tendril unbranched or branched. Raceme shorter than leaf, 2-7-flowered; bracts caducous; pedicels hispidulous. Calyx campanulate or subcampanulate, 4.5-6 mm, sometimes tomentose. Corolla blue-purple or purple; standard violin-shaped or oblong, 10-12 × ca. 5 mm, subequaling wings and longer than keel. Ovary stalked, fusiform, glabrous; ovules ca. 6. Legume oblong, ca. 23 × 6 mm, glabrous. Seeds 1-5, spheroid. Fl. Jun-Sep, fr. Aug-Sep.
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