Lianas, to 10 m. Branchlets ridged, densely yellow pubescent, gradually glabrescent. Leaves 11-or 13-foliolate; rachis 25-30 cm, including petiole 2-3 cm; stipels absent; leaflet blades ovate to ovate-elliptic, 6-10 × 3-4 cm, papery, both surfaces villous but especially dense abaxially, secondary veins 4 or 5 on each side of midvein, base rounded to subcordate, apex acute. Pseudoracemes axillary, 8-12 cm, yellow pubescent. Pedicel ca. 1 cm. Flowers ca. 2.5 cm. Calyx ca. 1.2 cm, densely sericeous. Corolla lilac; standard oblong, without a basal callus, outside densely yellow sericeous, apex retuse. Ovary stipitate, sericeous, with 4-6 ovules. Legume linear-oblong, 10-11 × ca. 1.8 cm, leathery, with a ca. 1 cm stipe, grayish brown tomentose. Seeds ca. 4 per legume, brown, oblate, ca. 1.1 cm. Fl. Apr-Jun, fr. Jun-Oct.
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