Climbing herbs. Leaf pinnately trifoliolate, stipules and stipels present. Inflorescence an axillary raceme, flowers paired or fasciculate on the axis. Bracts persistent, bracteoles small. Calyx tube gibbous, 2 upper teeth connate to the tip. Vexillum narrowed to the base, not auricled. Wings adhering to the keel. Stamens diadelphous, 9+1, vexillary stamen free, anthers uniform. Ovary subsessile, many-ovuled, style beardless, stigma capitate. Fruit linear, 2-valved, septate between the seeds.