Description from Flora of China
Herbs, slender, twining and climbing. Stems hairy at first, later glabrescent. Leaflets membranous or papery, strigose on both surfaces, terminal leaflet ± narrowly ovate-rhomboid, symmetric, lateral ones oblique, 5-9 × 2-6 cm, base broadly cuneate or obtuse, apex caudate-acuminate. Calyx densely hispidulous; upper 2 teeth connate into an entire or emarginate lip; lowest tooth lanceolate, 6-7 mm. Corolla pink or light purple; standard obovate-orbicular or suborbicular, ca. 2 × 1.7 cm; wings broadly spatulate, slightly longer than or as long as standard, base with auricle as long as claw, apex rounded; keel much longer than wings, upper part coiled inward, base with long claw and short auricle. Ovary with 2-4 mm stipe, with or without small cup-shaped disk at base. Style and filaments coiled inward for 1 or 2 turns in upper part. Legumes linear-oblong, densely hirsute with brownish black long hairs.
Open forests, mountain slopes, scrub, roadsides; 1400-1800 m. Sichuan, Xizang, SW Yunnan [Bhutan, Nepal].