Shrubs, scandent, 4-10 m. Bark smooth. Branchlets pale yellow, ridged, appressed pubescent, glabrescent, with scattered obscure lenticels. Leaves (5 or)7-foliolate; rachis 20-25(-40) cm, including petiole (3-)5-6(-7) cm; leaflet blades ovate-oblong to elliptic-lanceolate, 6-16 × 2.5-8 cm, papery, both surfaces dark green and glabrous, base broadly cuneate to rounded, apex acute. Panicles terminal, ca. 30 cm; flowering branchlets 8-10 cm, spreading, yellowish brown tomentose. Flowers 1.4-1.5 cm. Calyx pubescent. Corolla purple, with yellow-green spots in center; standard orbicular, without basal calluses, base tapering into a claw. Ovary glabrous, with numerous ovules. Legume carmine when dry, oblong, 10-11 × 2-3 cm, inflated, woody, contracted between seeds; suture thickened. Seeds 2-7 per legume, brown, ellipsoid, ca. 2 cm; hilum white. Fl. Jul-Aug, fr. Sep-Nov.
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