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 background, 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 subglabrous; 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. Inflorescences 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 4/-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 conspicuous dark sessile pustular glands scattered 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.
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A shrub or small tree. It has several stems. It loses its leaves during the year. It forms thickets. The stems are spiny. The spines are straight and white. It grows 1-8 m high. The bark is smooth and red and does not flake off. The leaves usually have 1 but occasionally 2-3 pairs of pinnae. These have 3-5 pairs of leaflets. The flowers are bright yellow and in round heads. The fruit are small pods that are curved and 5 cm long by 1 cm wide. The seeds are greenish brown.
Many-stemmed shrub or tree, up to 4 m high. Stipules spinescent. Spines 5-70 mm long. Leaves usually with 1 pinna pair, rarely 2 or 3 pairs. Involucel at or near base of peduncle. Flowers in round heads. Flowers bright yellow.
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