Climber or trailing shrub, up to 10 m. Branchlets terete, reddish tomentose in the distal parts, glabrescent, armed by recurved prickles, 0.5-1.5 cm, each emerging from the bases of the leaf-scars, caducous. Stipules lanceolate-linear, caducous, c. 3 by 1 mm, reddish tomentose. Leaves: rachis 9-16 cm, puberulous, with a gland 0.2-0.6 cm above the base, circular, raised, convex, c. 1.5 mm in diameter; pinnae 5-7 pairs, 3-8.5 cm, with glands just below the junctions of the petiolules of the 2-4 distal pairs of leaflets, elliptic, c. 0.2-0.5 mm; leaflets 5-14 pairs per pinna, opposite, petiolule 0.5-1 mm, chartaceous, oblong to obovate or subtrapezoid, unequal-sided, base half cuneate/ half rounded or ± cuneate, apex rounded to obtuse, nearly always with a triangular cusp; both surfaces laxly appressed puberulous; main vein ± diagonal. Inflorescences composed of pedunculate glomerules aggregated into terminal, red-brown tomentose-floc-culose panicles, peduncles solitary or a few together, 0.7-2 cm, with glomerules of 15-25 sessile flowers. Flowers dimorphic, tetramerous or pentamerous, bisexual. Calyx shortly obconical, 1.2 mm, hirsute by semipatent hairs; teeth inconspicuous, triangular, acute, 0.2 mm. Corolla greenish white, narrowly funnel-shaped, 4-5 mm, hirsute (by semipatent hairs); lobes lanceolate-oblong, c. 1.5 mm, obtuse. Stamens few, c. 12-20 mm, white (or pink in the proximal part), tube equalling the corolla-tube. Ovary c. 1 mm, with a few curly hairs, stipe c. 1 mm. Pod brown, oblong, straight, flattened, thinly chartaceous, 10-20 by 2-4 cm, dehiscing along both sutures, glabrous, slightly swollen over the seeds, with inconspicuous, transverse veins. Seeds ovate-oblong, strongly flattened, c. 8 by 5 mm; areole ± oblong, 6.5 by 2.5 mm, pleurogram parallel to the margins of the seed, open towards the hilum.
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