voluble; leaflets broadly ovate or rhomboid, acute, glabrous, membranous; peduncles elongate, interruptedly racemose, many-flowered; calyx bibracteolate, its lower lobes subacute; carina angularly incurved, rostrate; style laterally compressed, subspathulate, equally pubescent; legume tapering at base, broadly scimetar-shaped or subfalcate, the thickened sutures crispulate. Plant glabrous or nearly so, extensively climbing. Petioles 2–3 inches long. Leaflets 1 1/2–2 inches long, 2 inches broad, thin, full green, finely veiny. Stipellæ subulate. Peduncles 10–12 inches long; the rachis flexuous, and subdistantly nodulose, emitting 2 or more flowers from each node. Bracteoles suborbicular, striate, equalling the calyx-tube. Corolla purple or white, the vexillum reflexed, and the long, rostrate carina upturned like that of a Crotalaria. Legume curled along the margin.