Senegalia welwitschii subsp. delagoensis (Harms) Kyal. & Boatwr.

Tree to 13 m high with a rounded, flattened and somewhat spreading or irregularly open crown. Bark yellowish-or grey-to reddish-brown or blackish, rough, irregularly fissured; young branchlets grey-to reddish-brown or purplish, glabrous or occasionally sparingly pubescent. Stipules not spinescent, in pairs, ± linear, 1-3.5 x 0.3-0.6 mm, glabrous, soon deciduous. Prickles in pairs below the nodes, strongly recurved, often broad-based, greyish-brown to blackish, up to 9 mm long. Leaves: petiole 0.6-1.9(2.4) cm long, adaxial gland usually present, variable in position, 0.3-0.8 x 0.2-0.5 mm; rhachis (0.9)1.2-4.1(5.8) cm long, glabrous or occasionally sparingly pubescent, eglandular or with a gland at the junction of the top pinna pair; pinnae 3-5 pairs; rhachillae 0.7-2.3(3.4) cm long, glabrous or occasionally sparingly pubescent, usually with a small gland at the junction of the top few leaflet pairs or sometimes each leaflet pair; leaflets 3-9 pairs per pinna, 5-9.5 x 2.5-5 mm, elliptic or broadly elliptic, sometimes somewhat ovate, apex rounded and often slightly emarginate, nearly symmetrical basally, glabrous, veins rather prominent beneath. Inflorescences spicate, fascicled or solitary. Flowers yellowish-white, sessile or almost so; spikes 2.6-5.6 cm long; peduncles 0.5-1.2 cm long, glabrous or occasionally sparingly pubescent. Calyx sometimes tinged with pink, glabrous, tube 0.9-1.4 mm long, lobes up to 0.9 mm long. Corolla glabrous or occasionally with few glandular hairs, tube 1.6-2.3 mm long, lobes up to 1.1 mm long. Stamen-filaments free, up to 5.5 mm long; anthers ±0.15 mm across, with a deciduous apical gland. Ovary to 1.3 mm long, glabrous, stipitate. Pods grey-to reddish-brown, 5.2-12.2(16.6) x 1.4-2 cm, straight, linear-oblong, rounded to ± acuminate apically, longitudinally dehiscent, coriaceous, venose, glabrous. Seeds olive-to reddish-brown, 7-13 x 7-13.5 mm, irregularly subcircular, compressed; central areole 4-8 x 4-9 mm, horseshoe shaped.