Lianas. Branches glabrous, with pale gray lenticels. Leaves 7-or 9-foliolate; rachis 10-15 cm, including petiole 4-5 cm; leaflet blades oblong, 4-10 × 1.4-2.8 cm, papery, abaxially glabrous, midvein raised on both surfaces, secondary veins 6 or 7 on each side of midvein, base broadly cuneate to slightly obtuse, apex caudate-acuminate. Racemes axillary, narrow and elongated, 10-25 cm; rachis sparsely puberulent, with 2-6 fascicled flowers. Pedicel filiform, 3-5 mm, sparsely puberulent. Flowers 9-10 mm. Calyx campanulate, ca. 3 mm long and wide, glabrous; teeth deltoid. Corolla whitish, 6-7 mm; standard elliptic to orbicular, base subtruncate, apex emarginate. Ovary puberulent. Legume ligulate-oblong, 4-9 × 1.2-1.5 cm, compressed, glabrous; abaxial suture with a 0.8-1.5 mm wide wing, adaxial suture with a 3-4 mm wide wing. Seed 1 per legume. Fl. May-Aug, fr. Nov-Dec.
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