"Twining herbs, glabrous. Leaves paripinnate, leaflets opposite, to 11 pairs, to 3 x 1 cm, oblong, obtuse, chartaceous, terminal leaflets larger; stipule lanceolate, deflexed. Flowers crowded in short tubercles, on long axillary raceme; calyx cupular, truncate; petals to 1 cm long, mauve, standard obovate; wings falcate, clawed; keel oblong; stamens monadelphous; ovary densely hairy. Pods 7 x 1 cm, oblong, slightly curved, compressed, glabrous; seeds many, 6 x 4 mm, dark red."