Vachellia rehmanniana (Schinz) Kyal. & Boatwr.

Shrub or tree to 10 m high with a somewhat flattened spreading crown. Bark reddish-brown to black, rough; young branchlets clothed with dense spreading hairs, the hairs golden at first but turning greyish-white, sometimes becoming glabrescent with age, the epidermis later peeling or flaking off to reveal a rusty-red inner layer. Stipules spinescent, in pairs, 0.5-5.4 cm long, straight or almost so, sparingly to densely pubescent with spreading hairs especially basally, becoming glabrescent with age; other prickles absent. Leaves densely clothed with spreading hairs, at first golden but turning greyish-white, sometimes becoming glabrescent: petiole 0.1-0.5 mm long, adaxial gland present, yellowish to reddish-brown, oval, somewhat flattened, up to 1.5(3) x 1(2) mm; rhachis 2.4-12 cm long, a small gland usually at the junction of the top 1-3 and bottom 1-6 pinnae pairs, sometimes present between each pinna pair or absent from some; well-developed leaves of mature shoots with 15-44 pinnae pairs (reduced leaves with as few as 8 pinnae pairs are sometimes also present); rhachillae 0.6-2.8 cm long; leaflets 24-48 pairs per pinna, 1.2-2.8 x 0.4-0.9 mm, linear to linear-oblong, apex rounded to acute, margins with conspicuous spreading hairs especially apically. Inflorescences capitate, on axillary peduncles, solitary or more usually fascicled, aggregated into a terminal 'raceme', each fascicle of heads subtended by young to scarcely developed leaves. Flowers white or cream, sessile; peduncles 0.5-2 cm long, clothed with dense spreading hairs, the hairs golden at first but soon turning greyish-white, eglandular; involucel below the middle of the peduncle. Calyx sparingly to densely pubescent towards the apices of the lobes, sometimes a small basal tuft of hairs also present, tube 1.6-2.2 mm long, lobes up to 0.7 mm long. Corolla glabrous apart from the sparingly to densely pubescent lobes, tube 2-2.8 mm long, lobes up to 1.2 mm long. Stamen-filaments free, up to 7 mm long; anthers with a deciduous apical gland. Ovary up to 1.6 mm long, sessile, sparingly to densely pubescent. Pods grey-or reddish-brown to olive, (2.9)7-10(14) x 1.1-1.8(2.2) cm, linear-oblong, straight or almost so, longitudinally dehiscent, flattened, not constricted between the seeds, slightly venose, glabrous to sparingly pubescent. Seeds olive-or reddish-brown, 4.5-8 x 4-7 mm, ellipsoid to suborbicular, scarcely compressed; areole 2.5-4.5 x 1.25-2.8 mm, completely closed.