Trailing or scrambling annual. Stem not winged, glabrous. Stipules foliaceous, 5-30 mm long, broadly ovate, hastate, rest of the leaf reduced to a tendril. Inflorescence a 1-2-flowered, axillary raceme. Peduncle 1-4 times as long as the stipules. Calyx 3-9 mm long, teeth equal to 3 times as long as the tube. Corolla bright to pale yellow. Vexillum 7-13 mm long. Fruit 18-35 mm long, 4-6 mm broad, glabrous, 4-6-seeded.