Herbs perennial, 60-300 cm tall, densely brownish villous on youngest growth (stems, leaves, and raceme before expansion). Stem erect, climbing, pilose. Leaves paripinnate, 8-12 cm; stipules fan-shaped or lanceolate, margin 2-or 3-toothed; leaflets 4-6-paired, linear to linear-lanceolate, 25-50 × 6-9 mm, papery, apex rounded or obtuse, mucronate; lateral veins 7-or 8-paired; petiolules densely hairy; tendril present. Raceme 6-16 cm, obviously longer than leaf, 20-25-flowered; rachis strong and straight. Calyx obliquely campanulate, hairy. Corolla yellow, dark yellow, or dull orange, marked purple at apex of standard, or at first pale greenish cream with violet veins on inner surface of standard; standard oblong, 7-12 × ca. 5 mm, subequaling wings and slightly longer than keel. Ovary stalked; ovules 4-6. Legume stalked, falcate, 35-40 × 7-9 mm. Seeds 2-4, oblate-spheroid. Fl. and fr. May-Sep.
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