Unarmed trees or shrubs. Stipules not spinescent, filiform, persistent. Leaves bipinnate, sensitive to the touch; rachis and pinnae with extrafloral nectaries; leaflets opposite. Inflorescences consisting of pedunculate glomerules aggregated into axillary clusters of 1-5 in the distal leaf-axils; peduncles with ring of bracts just below the glomerules. Flowers usually pentamerous, uniform, bisexual or male by abortion. Calyx connate, valvate, with 5 teeth. Petals 5(-7), free. Stamens (8-) 10, free, or filaments loosely coherent at the base; anthers with a stipitate gland at the apex of the connective. Pods rigid, parchment-like, straight or slightly curved, indehiscent or very tardily dehiscent, but always splitting along the margins, endocarp not separating from the exocarp. Seeds brown, biconvex, with areole, wingless, aril absent, endosperm present.
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