Lianas, 1.5-3 m. Stems grayish brown, rough, gray puberulent, glabrescent. Leaves 5-foliolate; rachis 12-18 cm, including petiole 3-5 cm; stipels ca. 1 mm; petiolules 2-3 mm; leaflet blades ovate-elliptic to oblong-elliptic, lateral pairs 6-8(-10) × 2-3(-4) cm, terminal one ca. 18 × 8 cm, papery, with sparse trichomes or glabrescent, base cuneate to subcordate, apex acute to obtuse. Panicles terminal, 8-15 cm; flowering branchlets spreading, straight, brown tomentose. Flowers 1.5-2 cm. Corolla purple; standard obovate, without basal calluses, outside densely sericeous. Ovary velutinous, with numerous ovules. Legume linear, 8-15 × 1.5-2 cm, inflated, shortly stipitate, yellow tomentose, contracted between seeds, apex with a curved beak. Seeds 5 or 6 per legume, dark brown, ovoid, ca. 2 × 1.5 cm; hilum in middle. Fl. Jun-Jul, fr. Oct-Nov.
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