Herbs perennial, 150-200 cm tall. Stem branched from base, slender, sparsely pilose or glabrescent. Leaves subsessile, paripinnate, 8-16 cm; stipules semihastate, bifid, margin entire or toothed; leaflets 4-7-paired, markedly discolorous, abaxially pale green, adaxially green, narrowly lanceolate to lanceolate-ovate, 10-45 × 7-15 mm, leathery, both surfaces sparsely villous or glabrescent, apex obtuse or retuse, mucronate; tendril 2-or 3-branched. Raceme 6-17 cm, subequaling or longer than leaf, 5-25-flowered, puberulent or glabrous; bracts absent. Calyx subcampanulate, shortly and unequally toothed. Corolla blue-purple to purple-red, red, yellow, or pale yellow, 10-13 mm; standard slightly longer than keel. Ovary stalk ca. 4 mm; ovules 3-6. Legume fusiform, 28-37 × 8-9 mm, glabrous. Seeds 2 or 3, dark brown, oblate, ca. 5 mm in diam. Fl. Jun-Aug, fr. Aug-Sep.
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