Small tree, or sometimes a shrub, 1·5-5 m. high; bark peeling on the stems; young branchlets with some scattered inconspicuous dark sessile glands, otherwise glabrous. Stipules spinescent, up to 6 cm. long, whitish, sometimes ± deflexed; “ant-galls” and other prickles absent. Leaves with a small sessile to shortly stipitate gland at the junction of each of the 1-6 pairs of pinnae; petiole and rhachides otherwise eglandular or only with a few small scattered inconspicuous glands; leaflets 3-6 pairs, 3-10 x 1·5-4·5 mm., glabrous, entire, eglandular or almost so, ± spinulose-mucronate at the apex; lateral nerves invisible beneath. Flowers golden-yellow, in axillary pedunculate heads 7-10 mm. in diam. scattered along shoots of the current or previous season; involucel 2/3-5/6-way up the peduncle, 2·5-4 mm. long. Calyx 1·5-2 mm. long, glabrous or subglabrous. Corolla 2·5 mm. long, glabrous outside. Pods dehiscent, 2-3·5 x 0·6-0·8 cm., falcate, ± constricted (sometimes only slightly) between the seeds, eglandular or almost so. Seeds olive-green to olive-brown, c. 6-7 x 4·5-6 mm., elliptic, compressed; areole 3-4 x 2·5-3 mm.