Unarmed trees or shrubs. Leaves bipinnate; stipules linear; rachis and pinnae bearing extrafloral nectaries; pinnae 1-4-jugate; leaflets alternate, petiolulate; basal ones smaller. Inflorescences axillary, pedunculate, head-like clusters borne on ordinary branchlet or several on a short branch. Flowers 5-merous; calyx and corolla connate. Stamens numerous, united at base. Pod flat, ±once-coiled, reddish inside, reddish brown outside, dehiscent along 1 suture. Seeds elliptic, obovate or subcircular; pleurogram present.