| 1 | Flowers large, more than 7.5 mm long, in loose, few-flowered panicles. Petals 8- 11 mm long. Anthers hairy on the inner side. Pods not twisted but straight at the base |
| 1' | Flowers small, less than 3.5 mm long, in densely flowered panicles. Petals 2.5-3.25 mm long. Anthers glabrous. Pods twisted 180° at the base |
| 2 | Leaflets obtuse or acute and slightly notched at the apex. Petals acute at the apex. Anthers oblong, 2-3 mm long. Ovary compressed oblong or obovate-oblong, glabrous except some hairs at the basal part. Pods glabrous |
| 2' | Leaflets acuminate at the apex. Petals rounded at the apex. Anthers heart-shaped, 0.5-0.75 mm long. Ovary compressed globular, densely dark-brown pubescent. Pods pubescent |
