Description from Flora of China
Woody climbers. Branches slender; young shoots slightly pubescent; branchlets sometimes hooked or twisted. Leaves 5-8 cm; stipules caducous, lanceolate, membranous; leaflets 7-13, narrowly oblong or obovate-oblong, 10-20 × 5-10 mm, both surfaces initially sparsely appressed pubescent, soon glabrous adaxially, persistently pubescent abaxially, base rounded or broadly cuneate, apex obtuse or rounded, emarginate. Flowers small, in axillary, compact, short panicles; bracts early deciduous, scaly, boat-shaped, imbricate, enclosing young inflorescence. Pedicel 1-2 mm; bracteoles deciduous, rusty puberulent, basal minute, lanceolate, epicalycine pair ovate, enclosing base of calyx tube. Calyx broadly campanulate, ca. 3 mm, outside rusty puberulent; teeth broadly triangular, very short, ciliate, obtuse or rounded except for lowest, lowest rather longer, acute. Corolla greenish white, fragrant, ca. 6 mm, rather long clawed; standard elliptic, emarginate, base of blade truncate, auriculate, attenuate to broad claw; wings and keel oblong. Stamens 9 or sometimes 10, monadelphous, sometimes with a free vexillary stamen. Ovary shortly stipitate, linear, glabrous except for ciliate ventral suture; style short; stigma small. Legume distinctly stipitate, oblong or strap-shaped, compressed, 3-7 × 0.8-1.4 cm, glabrous, 1-seeded, rarely 2-4-seeded. Seeds reniform, compressed, ca. 8 × 5 mm. Fl. Mar-May, fr. Jun-Nov.
● Among bushes on mountain slopes, by streams along valleys; 200-1500 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Jiangxi, Sichuan, Zhejiang.