Vachellia tenuispina (I.Verd.) Kyal. & Boatwr.

Stoloniferous slender shrub 0.3-1(2) m high, many stemmed and often forming dense thickets; young branchlets grey-or reddish-brown to purplish-black, with numerous small scattered glands, often glutinous, glabrous or subglabrous. Stipules spinescent, in pairs, 0.4-5.6 cm long, straight or slightly deflexed, slender, whitish, glabrous; other prickles absent. Leaves: petiole 0.2-1.1 cm long, glabrous or subglabrous, adaxial gland absent; rhachis 0-3.8 cm long, glabrous or subglabrous, with a sessile to shortly stipitate gland at the junction of the top 1-2 pinnae pairs or of the only pair of pinna, otherwise with small scattered glands; pinnae 1-6 pairs; rhachillae 0.3-1.8 cm long, glabrous or subglabrous, usually with small scattered glands; leaflets (3)4-9 pairs per pinna, (2.1)3-4.8 x 0.8-1.5 mm, linear or linear-oblong to obovate-oblong, glabrous, entire, eglandular, lateral nerves invisible beneath, apex spinulose-mucronate. Inflorescences capitate, on axillary peduncles, solitary or fascicled, scattered along shoots of the current or previous season. Flowers bright yellow, sessile or very shortly pedicellate; peduncles 0.8-3 cm long, glabrous or subglabrous, sparingly to densely glandular; involucel at or above the middle of the peduncle, 1-2 mm long. Calyx glabrous, tube 1.4-1.8 mm long, lobes up to 0.5 mm long. Corolla glabrous, tube 1.9-2.8 mm long, lobes up to 1 mm long, often reflexed. Stamen-filaments free, up to 5 mm long; anthers with a deciduous apical gland. Ovary shortly stipitate, glabrous, up to 2 mm long. Pods pale to dark yellowish-or chestnut-brown, 1.9-4(7.4) x 0.4-0.8 cm, slightly to strongly falcate, longitudinally dehiscent, venose, not or only slightly constricted between the seeds, with numerous dark sessile pustular glands scattered over the surface, slightly glutinous. Seeds olive to olive-brown, 4-7 x 3.5-5 mm, elliptic, compressed; areole 2-4 x 1.5-3 mm.