Tree to 30 or more meters. Leaves even-pinnate, short-petiolate, the rachis extended, the leaflets subopposite in pairs. Inflorescence terminal to cauliflorous, congested, in more or less conspicuously bracteate heads. Flowers ebracteolate, sessile; calyx with a thick basal, obconic, angular, receptacular portion, and 4-parted limb, 3 sepals similar, the fourth different, frequently circumscissile; petals 3 or 4, rudimentary to partially petaloid-expanded; stamens 12-16, the filaments connate below for about half their length, somewhat unequal; ovary slender, stipitate, the stipe completely adnate to the receptacular tube; style elongate, with a capitate stigma. Legume large, flat, 2-valved.
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