Perennial climbing or trailing herb. Stem glabrescent or at least not densely pubescent. Leaf trifoliolate, petiole 1.5-11.0 cm long, leaflets 2.5-8.0 cm long, 0.5-25 mm broad, ovate to lanceolate, acute or acuminate, glabrescent or not densely pubescent; petiolules 2-4 mm long; stipules 5-13 mm long. Inflorescence axillary 2-6-flowered, subumbellate. Peduncle 4.5-36 cm long. Pedicel 1-2 mm long. Bracteoles 5-8 mm long. Calyx pubescent, tube 5-7 mm long, teeth 2.0-8.0 mm long, the upper pair partly united. Corolla yellow, pink or purple, glabrous. Vexillum 2.0-3.5 cm long. Fruit 4-14 cm long, 2.5-4.0 mm broad, pubescent, hairs stiff, dark brown, 10-18-seeded.