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Many stemmed shrub with slender ascending branches or sometimes a slender tree, 1-5 m high. Bark dark reddish-brown to purplish-black or black, rough; young branchlets dark reddish-brown to blackish, flaking minutely, with numerous sessile glands, often glutinous, glabrous or sub-glabrous. Stipules spinescent, in pairs, 0,5-6,5 cm long, straight or slightly reflexed, slender, whitish, tips usually reddish-brown; other prickles absent. Leaves: petiole 0,5-1,8 cm long, adaxial gland often absent, sometimes a rather large sessile gland at or below the junction of the lowest pinna pair; rhachis (0) 2,5-4,7(6,8) cm long, glabrous or subglabrous, with a small sessile gland at the junction of the top 1-3 pinnae pairs, smaller scattered sessile glands present and sometimes numerous; pinnae (1)5-10(17) pairs; rhachillae 0,6-3,4 cm long, glabrous or subglabrous, glandular; leaflets (5)8-15 (18) pairs per pinna, 1,5-5 x 0,8-2,2 mm, linear-oblong, margins clearly crenulate-glandular, surface glandular-punctate, glab­rous, apex rounded to subacute or shortly spinulose-mucronate. Inflorescences capitate, on axillary peduncles, solitary or fascicled, forming terminal racemes. Flowers bright yellow, sessile; peduncles 1,6-3,4 cm long, glabrous or subglabrous, glandular; in-volucel at or above the middle of the peduncle. Calyx glabrous or subglabrous, tube 1,2-1,8 mm long, lobes up to 0,5 mm long. Corolla tubular, glabrous, tube 2-2,5 mm long, lobes up to 0,8 mm long, spreading slightly, often reflexed. Stamen-filaments free, up to 4,5 mm long; anthers with a deciduous apical gland. Ovary up to 1,4 mm long, shortly stipitate, glabrous. Pods dark brown to reddish-brown or blackish, 2,8-7,5(10) x 0,5-0,8 cm, slightly to strongly falcate, often curled into an almost complete circle, ± moniliform, irregularly constricted between the seeds, with numerous sessile pustular glands on the surface, glutinous, longitudinally dehiscent, glabrous or sub­glabrous. Seeds olive-brown, 4,5-6 x 3,5 — 5 mm, elliptic to subcircular, compressed; areole 2,5-4 X 2,5-3,5 mm.