Twining or trailing herb, branches brownish tomentose. Leaf trifoliolate, petiole 3.7-11.5 cm long; leaflets 3.0-6.3 cm long and broad, orbicular, acute or acuminate, sparingly pubescent on both sides; stipels absent; stipules 3-4.5 mm long. Inflorescence a solitary axillary or 2-flowered raceme. Pedicel 0.6-1.0 cm long. Calyx 1.0-1.4 cm long, densely pubescent, teeth, longer than the tube. Corolla 1.2-1.3 cm long. Fruit 2.5-4.0 cm long, 1.2-1.3 cm broad, linear oblong, pubescent, hairs long, with furrows between the seeds, 5-7-seeded.