Annual or perennial herbs. Leaf imparipinnate, leaflets entire; stipels absent; stipules free or connate. Inflorescence a peduncled raceme or head. Bracts small, bracteoles below the calyx present. Calyx teeth subequal. Corolla pink, purplish, yellow or whitish. Vexillum longer than the wings; keel longer or rarely shorter than the wings, obtuse. Stamens diadelphous, 9+1, anthers uniform. Ovary 2-8-ovuled. Fruit a lomentum, segments glabrous, pubescent, bristly or spiny.