Lianas. Stems reddish brown, terete, slender, with dense minute lenticels. Leaves 7-or 9-foliolate; rachis 6-18 cm, including petiole 2-3 cm; leaflet blades ovate, (1.5-)3-5(-6) × 1-2.5 cm, papery, both surfaces glabrous, abaxially dull grayish green when dry, adaxially dark green, secondary and tertiary veins indistinct, base rounded, apex acute. Racemes axillary, 8-12 cm, as long as subtending leaf, puberulent. Flowers 1.2-1.5 cm. Corolla white or purple, apically slightly roseate at margin; standard oblong, glabrous, without basal calluses. Ovary stipitate, glabrous, with numerous ovules. Legume linear, ca. 10 × 1.2 cm, flat, straight, base tapering to a ca. 3 mm stipe, apex with a short hooked beak. Seeds 5-9 per legume, black, lenticular, ca. 7 × 5 mm. Fl. Jun-Aug, fr. Sep-Oct.
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