Annual or perennial herbs. Leaf palmately trifoliolate, rarely unifoliolate, stipules minute or foliaceous, solitary or in pairs. Inflorescence racemose or subumbellate, 1-many flowered, terminal or leaf-opposed. Calyx 5-lobed, the upper 4 united higher up than the lower lobe. Vexillum orbicular to oblong. Keel incurved. Stamens monadelphous, tube split along the upper side, 4 with long and 6 with short anthers. Ovary sessile, many-ovuled, style incurved, stigma terminal. Fruit oblong, 2-valved, many-seeded.