Twining herbs. Stems densely pilose or subglabrous. Leaves pinnately 3-foliolate; stipules broadly lanceolate; stipels linear-lanceolate; leaflets broadly rhombic-ovate or ovate, 10-11 × 9-9.5 cm, sparsely pilose, base rounded or obtuse to broadly cuneate, apex acute or slightly obtuse or with very short acumen. Racemes pubescent, with flowers paired at swollen nodes of axis; peduncles 4-7 cm. Bracteoles 7-8 mm. Calyx 7-8 mm; teeth short, upper 2 nearly wholly connate. Corolla purple, glabrous; standard suborbicular, ca. 15 mm, below middle with 2 callosities, base with inflexed auricles, claw curved; wings obliquely oblong, 16-17 mm; keel dorsally curved, apex obtuse. Ovary linear, shortly stipitate, very shortly tomentose; style glabrous, thickened; stigma brush-shaped. Legumes tomentose when young, glabrescent when mature.
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