Lianas, to 6 m. Stems brown, rough, without lenticels. Branchlets yellowish white pubescent, generally glabrescent. Leaves 3-or 5-foliolate; rachis 12-25(-35) cm, including petiole (4-)6-7(-9) cm; leaflet blades broadly ovate to elliptic, 8-15(-22) × 3.5-6(-10) cm with basal pair usually smallest, papery, abaxially with yellow or white scattered trichomes but glabrescent when mature, adaxially glabrous or with sparse tri-chomes on veins, base cuneate, rounded, or rarely cordate, apex acute. Panicles axillary, strong, 12-18 cm, densely pubescent; flowering branchlets short. Flowers 1.8-2.3 cm. Corolla lilac to mauve; standard orbicular, with 2 basal calluses, outside densely sericeous, base shortly clawed. Ovary tomentose, with 5 ovules. Legume oblong, ca. 9 × 3 cm, inflated, yellow tomentose, apex beaked. Seeds 1 or 2 per legume, pale brown, broadly ovoid, ca. 2.5 × 2 cm. Fl. Apr-May, fr. Sep-Oct.
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