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Shrub or small tree up to 5 m high. Bark yellow to yellowish-brown or brown, soft, corky, sometimes slightly papery, fissured; young branchlets creamy-white or yellowish to pale grey-brown or brown, glabrous to puberulous. Stipules spinescent, in pairs, 0,4-3 cm long, straight, slender, mostly ascending, glabrous or densely puberulous; other prickles absent. Leaves: petiole 0,3-0,9 cm long, glabrous to densely puberulous, adaxial gland often absent, when present usually just below the lowest pinna pair; rhachis (3,6)8-14(18) cm long, glabrous to densely puberulous, with a gland at the junction of the top 1-6 pinnae pairs; pinnae of well-developed leaves in 12-27 pairs (reduced leaves with as few as 8 pairs of pinnae sometimes also present); rhachillae 1,8-4,4(5,6) cm long; leaflets (17) 20-36(44) pairs per pinna, 1,9-6 X 0,6-1 mm, linear to linear-oblong, apex obtuse to subacute but not spinulose-mucronate, eglandular, margins glabrous or occasionally with few short cilia, usually glabrous below. Inflores­cences capitate, on axillary peduncles, fascicled, borne along shoots of the current season and often aggregated into ± elongate terminal "racemes". Flowers bright-yellow, sessile; peduncles 0,8-3(6) cm long, glabrous to densely puberulous; involucel 1/3-2/3-way up the peduncle. Calyx glabrous except for pubescence on the lobes, especially apically, or sparingly puberulous throughout, tube 0,9-1,4 mm long, lobes up to 0,4 mm long. Corolla glabrous, tube 1,4-1,9 mm long, lobes up to 0,6 mm long. Stamen-filaments free, up to 4 mm long; anthers with a deciduous apical gland. Ovary up to 1,75 mm long, glabrous. Pods pale to dark yellowish-brown or brown, (5)7-12(17) x 0,5-0,8 cm, linear, straight to slightly falcate, longitu­dinally dehiscent, not or somewhat con­stricted between the seeds, glabrous to sparingly puberulous, eglandular, flat, incon­spicuously venose, sometimes irregularly swollen and pustulate from insect attack. Seeds olive- to dark-brown, 6-7,5 x 3-5,5 mm, elliptic, compressed; areole 4-5 x 2,5-3,5 mm.