Climbers, prickly. Branchlets ferruginous puberulent. Leaves with pinnae 2 or 3 pairs; petioles and petiolules pu­berulent; leaflets 4-6 pairs, adaxially shiny, oblong, 4-15 × 2.5-7 cm, leathery, abaxially puberulent, adaxially glabrous, both ends obtuse-rounded or apex very obtuse. Racemes axillary or panicles terminal. Flowers yellow; pedicels 9-10 mm. Sepals 5, ca. 5 × 3 mm. Petals ca. 10 × 5 mm, shortly clawed. Stamens 10; filaments ca. 1 cm, puberulent in lower part. Ovary subsessile, 2- or 3-ovuled, glabrous; style ca. 1 cm; stigma truncate. Legume compressed, suborbicular, 3.5-4 × ca. 3.5 cm, dorsal suture extending to both sides and forming a carinate narrow wing; valves brown, woody, with robust reticu­late veins. Seed solitary, brownish black, compressed, subor­bicular, ca. 2 cm in diam. Fl. Feb, Apr, Jul, fr. May-Jun, Aug, Oct-Nov.

● Forests, among bushes; 400-1800 m. Guangdong, Guangxi, S Guizhou, S Yunnan.