Shrub or tree to 10 m high; trunk to 0.35 m in diam.; branches usually ascending. Bark pale to dark greyish-brown or brown, rough; young branchlets grey-or reddish-brown, densely puberulous to pubescent, frequently with minute reddish glands scattered in amongst the pubescence. Stipules not spinescent, in pairs, linear, 1.8-3.8x 0.2-0.7 mm, soon deciduous. Prickles in pairs just below the nodes, usually strongly recurved, sometimes straightish, often broad-based, up to 8 mm long. Leaves: petiole 0.3-1.3(2.2) cm long, adaxial gland usually present, variable in position, slightly raised or occasionally stalked, 0.4-1.1 x 0.1-0.4 mm; rhachis 1.7-6(10) cm long, puberulous to densely pubescent, abaxial surface often with scattered recurved prickles up to 2 mm long, with a gland at the junction of the top 1-3(7) pinnae pairs and occasionally between the lowest 1-3 pairs; pinnae 8-14(26) pairs; rhachillae (0.5)1-2.4(3.4) cm long, puberulous to densely pubescent; leaflets grey-green, (16)20-36(48) pairs per pinna, 1-4 x (0.25)0.5-1.1 mm, linear to linear-oblong, apex rounded to subacute, glabrous or sparingly to densely appressed-pubescent below, margins with or without spreading cilia. Inflorescences spicate, solitary, fascicled or crowded into an irregular terminal panicle. Flowers yellowish-white, sessile; spikes (2.2)3-7.4(8.6) cm long; peduncles 0.3-2.8 cm long, puberulous to densely pubescent, often glandular. Calyx densely puberulous to pubescent, tube 1-2 mm long, lobes 0.4-1.1 mm long. Corolla subglabrous or appressed-pubescent especially towards the apices of the lobes, tube up to 3.4 mm long, lobes up to 1.1 mm long. Stamen-filaments free, up to 7.5 mm long; anthers ±0.15 mm across, with a deciduous apical gland. Ovary 0.7-1.5 mm long, glabrous, shortly stipitate. Pods olive-to reddish-brown or brown, (5)6-11(14) x (0.9)1.2-2.3 cm, straight, acute to distinctly acuminate apically, longitudinally dehiscent, margins entire or frequently irregularly constricted between the seeds, umbonate over the seeds, coriaceous, puberulous to densely pubescent, with numerous minute scattered reddish-brown glands. Seeds olive-to light brown, subcircular, 7-10 x 5-10 mm, compressed; central areole up to 4 x 3 mm, horseshoe shaped.
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Tree or shrub, up to 10 m high; prickles many, conspicuous in pairs just below nodes, strongly recurved. Leaves with pinnae < 4 mm apart, giving leaf a compact appearance; leaflets 0.51.1 mm wide; petioles up to 13 mm with rachis up to 60 mm long. Flowers: inflorescence spicate; corolla yellowish white; Nov.-Feb. Pods 12-23 mm wide, puberulous to densely pubescent, margins often irregularly constricted between seeds.
Tree or shrub, up to 10 m high. Prickles in hairs just below nodes, strongly recurved. Pinnae less than 4 mm apart, giving leaf a compact appearance; leaflets 0.5-1.1 mm wide. Pods 12-23 mm wide, puberulous to densely pubescent, margins often irregularly constricted between seeds. Flowers yellowish white.
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