Ascending or climbing annual, stem sparingly pilose or subglabrous. Leaf paripinnately compound, leaflets 2-6, 1-7 cm long, 3-22 mm broad, obovate or oblong to lanceolate or linear, obtuse or acute, sparingly pilose to subglabrous; stipules 5-15 mm long, ovate-semi sagittate, dentate, teeth 6 or more; tendrils simple or branched. Inflorescence axillary, 1-3-flowered. Calyx 9-11 mm long, pilose, teeth subequal, longer than the tube. Corolla usually bicoloured. Vexillum purple, 16-20 mm long, wing and keel whitish. Fruit 2.5-4.5 cm long, 7-11 mm broad, narrowly oblong, subrecurved, pubescent, margin ciliate, 2-7-seeded.