A shrub or small tree, branches slightly zigzag, marked with grey or pale brown dots, young twigs glabrescent. Spines stipular, in pairs, straight, c. 7-18 mm long. Rachis 1.2-5.5 cm long, pilose, petiole usually with a small gland, about the middle. Pinnae 2-8 pairs, c.1.2-2.5 cm long, leaflets 10-20 pairs, sessile, c.2.5-5.5 mm long, 1.0-1.5 mm wide, linear, oblong, acute, base oblique, glabrous to subglabrous. Inflorescence globose pedunculate heads in axillary fascicles, peduncle c. 1.2-2.5 cm long, slender, pubescent; bracts whorled, at or near the apex of the peduncle. Calyx c. 1.5-1.8 mm long, campanulate. Corolla c. 2.5 mm long. Pod 4.5-7.5 cm long, c. 1.2 cm broad slightly curved, dark brown, mesocarp pulpy. Seeds numerous, biseriate.