Vines, 3-4 m. Stems twining, slender, hairy when young. Leaves pinnately 5-foliolate, 12-25 cm; stipules narrowly triangular, 2-4 mm, hairy, caducous; petiole 5-8(-12) cm, glabrous; leaflets oblong to ovate-oblong, 3.5-13 × 2-7 cm, papery, glabrous, base obliquely cuneate to nearly rounded, apex acuminate or acute, shortly caudate. Raceme 15-40 cm; peduncle 4-20 cm; nodes 2-or 3-flowered. Bracts and bracteoles small, linear, deciduous. Calyx campanulate, 2-lipped; lobes triangular, shorter than tube. Corolla red, reddish purple, or orange, ca. 2 × as long as calyx; standard longest, 1-2 cm; wings shortest, 0.6-1.2 cm; keels linear, curved to semicircular. Filament to 2 cm. Style curved to circular or semicircular. Legume linear, 8-19 × 0.6-0.7 cm, straight or slightly curved, compressed, glabrous, apex beaked. Seeds 12-21, dark brown, reniform, lustrous. Fl. Jul-Sep, fr. Aug-Nov.
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