Description from Flora of China
Millettia scabricaulis Franchet, Pl. Delavay. 158. 1889.
Lianas. Branches scabrous, with convex lenticels, brownish pubescent when young. Leaves 7-13-foliolate; rachis 9-14 cm, including petiole 4.5-6 cm; petiolules blackish brown; leaflet blades obovate-oblong to oblong, 5-9 × 1.5-3 cm, papery, glabrous, base obtuse, rounded, or broadly cuneate and rather oblique except for apical one, apex shortly acuminate. Pseudoracemes axillary or terminal, ca. 25 cm or much longer; rachis nodes with 2 or 3 fascicled flowers. Pedicel 2-3 mm, puberulent. Flowers 1-1.2 cm. Calyx campanulate, 2-3 mm, appressed yellowish puberulent; teeth obscure. Corolla reddish, glabrous, ca. 5 × as long as calyx; standard orbicular. Ovary pubescent. Legume oblong, 6-9 × ca. 3 cm, thin, glabrous; abaxial suture with a 0.5-1 mm wide wing, adaxial suture with a 3-5 mm wide wing. Seeds 1 or 2 per legume. Fl. May, fr. Aug-Sep.
● Valleys in mountains, scrub; 1400-2500 m. Xizang, Yunnan.