Description from Flora of China
Shrubs, ca. 2 m high. Young branches, rachis, young branches of flower, and leaf densely velutinous. Leaves 15-20 cm; stipules linear, 6-7 mm, villous; leaflets 13-41, opposite or nearly opposite, ovate-lanceolate, elliptic, elliptic-lanceolate, oblong, or ovate-oblong, 1-4 × 0.5-2 cm, papery, hairy on both surfaces, glabrous, or glabrous adaxially, midvein raised, base rounded or obtuse, apex acuminate or acute with mucro. Racemes opposite with leaf or pseudo-opposite, 15-20(-30) cm. Flowers many, widely spaced; bracts similar to stipule, 6-8 mm, hairy; pedicel short, 2-3 mm. Calyx campanulate, ca. 13 mm; teeth 5, unequal, dark brown hairy. Standard reflexed, obovate-lanceolate or obovate-oblong, ca. 16 × 3-5 mm, apex retuse, narrowing to base; wings oblong, less than 15 mm, base auriculate; keel falcate, slightly shorter than wings. Stamens 10, free or slightly fused at base. Ovary terete, densely yellow pubescent, stalked; ovules 4-6; style straight, glabrous; stigma capitate, very small. Legumes moniliform, slightly compressed, 6-10 × 0.7-1 cm, hairy or nearly glabrous. Seeds 2-4, yellow or yellow-brown, oblong-reniform, ends acute to rounded. Fl. and fr. Apr-Aug.
Forests, mountain forests, valleys, riverbanks, rocky places; 500-2500 m. Guangxi, Guizhou, Sichuan, Yunnan [Bangladesh, Bhutan, India, Myanmar].