Twining herbs. Stems slender, over 1 m, sparsely pubescent with yellowish hairs. Leaves pinnately 3-foliolate; stipules ovate-lanceolate, ca. 6 mm, ciliate, 7-veined; stipels lanceolate, ca. 2 mm, densely hirsute; leaflets broadly rhombic-ovate, 2.5-4.8 × 2.5-4.5 cm, lateral ones more narrow, oblique, white strigose on both surfaces, especially on veins abaxially, 3-veined, base broadly cuneate, apex acute. Racemes axillary; peduncles equal in length to petiole; rachis ± densely hirsute with short curved hairs. Pedicels 2.5-4 mm; bracts and bracteoles lanceolate, 1.5-2 mm. Calyx tube obliquely cup-shaped, 1-1.5 mm, puberulent or subglabrous; teeth broadly triangular, upper 2 connate for ca. 2/3 of length. Corolla violet, ca. 1.2 cm; standard suborbicular, slightly emarginate, base attenuate into a claw, with appendages and auricles; wings oblong-obovate, as long as standard, clawed and with auricles; keel ca. 8 mm, slightly curved, margin rough. Ovary stipitate, sparsely hairy; style glabrous; stigma brush-shaped. Legumes linear-oblong, 6-8 × ca. 0.8 cm, slightly curved, compressed. Seeds 6-8. Fl. Aug.
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