Herbs twining. Stems glabrous, obviously ribbed. Stipules linear-lanceolate, 4-7 mm; petiole 2-11 cm; leaflets almost papery, equal or subequal, ovate, broadly ovate, or almost orbicular, 2-5 × 2-4.8 cm, glabrous or with sparse short adpressed hairs, lateral veins 4-6 pairs, slender, apex rounded or cuneate, usually slightly concave or with mucro. Raceme axillary, 3-12 cm, glabrous or sparsely hairy, densely flowered; peduncle 2-6 cm; bracts 2, similar to stipules. Flowers 1.5-1.8 cm; bracteoles 2, similar to stipules, persistent; pedicel 1-3 mm. Calyx 5-8 mm. Corolla light yellow; wings falcate-oblong; keels similar to wings, with claw, auricle absent. Ovary stipitate, base with sheathing floral disk; style long and curved, upper part enlarged, glabrous; stigma capitate. Legume linear-oblong, slightly curved, 3-4 × ca. 0.6 cm, glabrous, base acuminate, apex acuminate. Seeds usually 1 or 2. Fl. Aug-Sep, fr. after Oct.
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