Herbs, rarely small shrubs. Leaves digitately trifoliolate; stipules free. Flowers yellow; solitary, racemose or subumbellate, terminal or leaf-opposed. Bracts and bracteoles often small. Calyx bilabiate, teeth 2 to the upper and three to the lower lip. Vexillum suborbicular, wings obovate, keel slightly incurved, shorter than the vexillum. Stamens monadelphous, alternate anthers short and versatile, alternately longer and basifixed. Ovary sessile, many ovuled, style glabrous, stigma terminal, often oblique. Fruit linear, compressed, silky-villous, 2-valved.