Unarmed shrub or tree up to 5 m high; young branchlets subglabrous to sparingly pubescent. Leavesbipinnate, glaucous: petiole very short, 2-8 mm long; rhachis 0-1,2 cm long, with a gland at the junction of each or only the top few pinnae pairs; pinnae (1)2-4 pairs, crowded; leaflets 12-20 pairs, 3-7 X 0,8-1,5 mm, linear-oblong, often slightly falcate, glabrous throughout or with few marginal cilia. Inflorescences capitate, in axillary racemes or panicles longer than the leaves. Flowers bright yellow; peduncles 2-5 mm long. Calyx and corolla glabrous or almost so. Pods brown, 4-10 x 0,8-1,4 cm, straight or slightly curved, margins entire or only slightly and irregularly constricted between some of the seeds, dehiscing longi­tudinally along one margin. Seeds blackish, ±6x3 mm, smooth; caruncle conspicuous; areole ±5x2 mm.