Climbing, prostrate or sometimes erect herbs or subshrubs. Leaf pinnately trifoliolate; leaflets conspicuously gland-dotted below, stipules present, stipels small. Inflorescence axillary or terminal; racemose or paniculate. Bracts present, bracteoles absent. Calyx lobes unequal, upper 2 jointed. Vexillum with small auricles, pubescent or glabrous. Stamens diadelphous, 9+1, vexillary stamen free, anthers uniform. Ovary 1-2-ovuled, style pubescent below, incurved, stigma terminal. Fruit oblong, compressed, 1-2-seeded.