Description from Flora of China
Lianas. Young shoots rust-colored puberulent. Leaves 13- or 15-foliolate; rachis 20-30 cm, including petiole 5-6 cm; rachis and petiole canaliculate, sparsely puberulent; leaflet blades oblong to ovate-oblong but apical one obovate-elliptic, 5-7.5 × 2-2.5 cm, stiffly papery, both surfaces appressed scattered yellowish puberulent, base obliquely rounded to obtuse, apex shortly acuminate to slightly obtuse. Pseudoracemes axillary, solitary, longer than leaves; rachis yellowish puberulent; rachis nodes with 3-10 flowers, fascicled or on a 2-4 mm spur. Pedicel filiform, 4-5 mm, appressed yellowish pubescent. Flowers 1-1.2 cm. Calyx cup-shaped, 3-4 mm long and wide, outside densely yellowish pubescent; teeth small, unequal in length. Corolla white flushed with red; standard elliptic-ovate, outside glabrous or sparsely puberulent along veins, base truncate and shallowly cordate, apex slightly emarginate. Stamens unequal in length. Ovary villous. Legume linear-oblong, flat, 6-11 × 1.2-1.6 cm, sparsely villous, base attenuate into a stipe, apex apiculate; adaxial suture with a ca. 2 mm wide wing. Seeds 1-8 per legume. Fl. Jun-Jul, fr. Sep-Jan.
Sparse forests on mountain slopes; 800-1600 m. Guangxi, S Guizhou, S Yunnan [N Thailand].