Herbs twining. Stems 1-3 m, densely long hirsute. Stipules lanceolate, 4-6 mm, striate; petiole 4-9 cm, hirsute; petiolules 2-3 mm, ± hairy; stipels small, setiform; leaflets papery or herbaceous, almost ovate to broadly ovate, 4-6(-9) × 2.7-7 cm, abaxially glabrous or hirsute, adaxially glabrous, lateral veins 4-6 pairs, base almost truncate, broadly cuneate, or almost rounded, margin slightly sinuate, apex obtuse, with slender mucro; lateral leaflets oblique. Raceme axillary, 5-7 cm, usually glabrous, terminally 2-4-flowered; bracts small, setiform. Flowers 1.4-1.8 cm; pedicel 1-2 mm. Calyx 5-7 mm, glabrous or sparsely adpressed hairy. Corolla yellow or light yellow; standard ca. 11 × 9 mm, claw ca. 7 mm; wings ca. 7 mm; keels ca. 5.5 mm. Ovary linear; ovules 4-7. Legume linear, compressed, ca. 6 × 1 cm, glabrous, base stipitate, with persistent calyx, apex with long beak. Seeds 4-7. Fl. and fr. Jun-Aug.
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