Lianas, large. Young shoots, petioles, pedicels, bracteoles, and legumes yellowish puberulent. Branchlets robust. Leaves 9-or 11-foliolate; rachis ca. 25 cm, including petiole 4-4.5 cm; leaflet blades oblong or apical one oblanceolate, 6.5-11 × 2-3.5 cm, subleathery, abaxially densely yellowish puberulent, adaxially glabrous or yellowish puberulent in vein axils, base broadly cuneate, apex obtusely acuminate. Infructescences axillary. Pseudoracemes axillary, 20-30 cm; rachis nodes with 2 or 3 flowers borne singly along a short branchlet; bracts linear. Pedicel ca. 2.5 mm. Flowers 1.4-2 cm. Calyx cup-shaped, 4-6 mm, puberulent; teeth 5, abaxial tooth longer than others, adaxial 2 teeth subconnate. Corolla glaucous whitish, 1-1.4 cm; petals all long clawed. Ovary sessile, densely pubescent; style long and incurved, glabrous. Legume oblong, flat, 5-15 × 2-2.5 cm, densely yellowish brown shortly villous, base abruptly constricted, apex obtusely acute; adaxial suture with a 1-2 mm wide wing. Seeds 1-4 per legume. Fl. Jul-Aug, fr. Oct.
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