Many stemmed shrub with slender ascending branches or occasionally a slender tree to 4 m high. Bark reddish-brown to purplish-black; young branchlets yellowish-or reddish-brown to purplish, sometimes as though whitewashed over a purple backÂground, with numerous dark sessile pustular glands, sometimes glutinous, glabrous or subglabrous. Stipules spinescent, in pairs, 0,5-7 cm long, straight or slightly arcuate and deflexed, slender, whitish, tips usually reddish-brown; other prickles absent. Leaves: petiole 0,3-1,4 cm long, glabrous or subÂglabrous; rhachis 0-0,9 cm long, glabrous or subglabrous, a shortly columnar gland at the junction of the pinna pair; pinnae mostly 1 pair, rarely 3 pairs; rhachillae 0,5-1,4 cm long, glabrous or subglabrous, glandular; leaflets 3-5 pairs per pinna, 2,1-5,7 x 0,9-3(4) mm, linear-oblong to obovate or ovate, eglandular or with some small pale inconspicuous glands on the margin and sometimes the surface, glabrous, margins entire, apex usually shortly mucronate, lateral nerves inconspicuous beneath. InÂflorescences capitate, on axillary peduncles, solitary or fascicled. Flowers bright yellow, sessile; peduncles 0,6-2,4 cm long, glabrous or subglabrous, glandular; involucel basal or up to i-way up the peduncle. Calyx glabrous, tube 1-1,6 mm long, lobes up to 0,6 mm long. Corolla glabrous, tube 1,8-2,5 mm long, lobes up to 0,8 mm long, often reflexed. Stamen-filaments free, up to 5,5 mm long; anthers with a deciduous apical gland. Ovary shortly stipitate, up to 1,8 mm long, glabrous. Pods pale to dark yellowish-brown or chestnut, 2~4(5,6) x 0,6-1,3 cm, slightly to strongly falcate, not or scarcely constricted between the seeds, with numerous conÂspicuous dark sessile pustular glands scatÂtered over the surface, otherwise glabrous, longitudinally dehiscent, venose, apex obtuse, acute or mucronate. Seeds olive to olive-brown, 6-10 x 5-7 mm, elliptic, compressed; areole 4-6 x 2,5-3,5 mm.
