Shrubs or trees, branchlets pubescent or glabrous. Leaves large, simply pinnate, few-to many-foliolate; leaflets in pairs, opposite to subalternate, large, entire, short-petiolulate. Inflorescence capitate to short-racemose, terminal to cauliflorous, bracteate, the bracts often colored and caducous. Flowers large, showy, ensheathed basally by the coalesced bractlets; calyx 4-to 5-parted, submembranaceous, with an elongate, thickened receptacular base; petals 4-5, membranaceous, clawed; stamens 10-15. basally connate. Ovary stipitate, the stipe adnate the whole length of the receptacular tube. Legume flat, 2-valved.