Lianas. Branchlets brown, smooth and slender, yellow tomentose, glabrescent, without lenticels. Leaves (5 or)7-foliolate; rachis 30-35 cm, including petiole 5-7 cm; leaflet blades lanceolate, basal pair 4-8 × 2.5-3.5 cm, lateral pairs and terminal one 12-20 × 3.5-6 cm with terminal one largest, papery, abaxially densely villous, adaxially appressed pubescent, base broadly cuneate to narrowly subcordate, apex caudate. Panicles terminal, 20-40 cm, slender; flowering branchlet nodes scattered; peduncle rather long, yellow tomentose. Flowers 1.5-1.7 cm. Corolla red; standard obovate, outside densely sericeous. Ovary tomentose, with 6 ovules. Legume rhomboid to oblong, 3.5-8 × ca. 2.2 cm, dark brown tomentose, gradually glabrescent, slightly contracted between seeds, apex with a hooked beak. Seeds 1-3 per legume, reddish brown, oblate, ca. 1.5 × 2 cm. Fl. May-Aug, fr. Jul-Oct.
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