Woody climbers. Stem base bulbous; branches villous with brownish hairs, glabrescent when old. Stipules dorsifixed, sagittate, striate, pubescent, upper part ovate, 1-2 cm, base 2-lobed, lobes 5-10 mm; petiole 5-12 cm; stipels lanceolate, 5-10 mm; leaflets suborbicular, 7-16 × 6-14 cm, terminal one broader, lateral ones oblique, margin irregularly 5-7-lobed, apex mucronate, brownish villous on both surfaces. Racemes 10-25 cm, villous. Bracts ovate-lanceolate to lanceolate, 5-10 mm, sparsely villous; bracteoles ovate-lanceolate, 2-3 mm. Flowers 2 at each node. Calyx ferruginous hispid; tube 3-5 mm; lobes 4, lanceolate, 11-15 mm, upper one bifid. Corolla purplish red; standard obovate, ca. 1.6 × 1.3-1.5 cm, apex emarginate, shortly clawed, auricles reflexed; wings oblong, 1.5-1.7 cm, base auriculate; keel as long as wings, oblique, clawed. Vexillary stamen free, joined with others at middle. Ovary stipitate, silky pubescent. Legumes oblong, 7-8 × 8-12 cm, flattened, yellow-brown hirsute. Seeds red or brown, reniform, 7-9 × 5-6 mm, compressed. Fl. Jul-Aug.
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