Rhigozum zambesiacum Baker

Spiny shrub or small tree up to 4 m tall (reaching 7 m outside Flora Zambesiaca area), with rigid spreading branches with smooth greyish-brown bark, with shallow longitudinal ridges. Leaves 13-40 mm long, (2)3-5-jugate, very rarely 1-jugate, solitary or clustered in small almost glabrous cushions situated below the spines; petiole 4-9 mm long; rhachis winged; leaflets 5-9(14) x 3-4.5(6) mm, ovate, obovate, elliptic or rounded, sometimes emarginate at the apex, narrowly tapering or broadly acute at the base, margins entire, sessile. Flowers solitary or clustered on the cushions; pedicels 2-5 mm long. Calyx 3-5 mm long, subglabrous, 5-lobed, usually pilose at the apex. Corolla golden-yellow, with the tube 10-17 mm long, glabrous lower cylindrical part slightly exceeding the calyx; lobes 8-13 mm, subcircular, crenulate, margin ciliate, puberulous on the inner surface at the sinuses, becoming glabrous at last. Stamens adnate up to c. 8 mm from the base of the corolla tube; filaments c. 5 mm long; anthers 4-5.5 mm long, slightly apiculate, exserted from the corolla tube. Ovary c. 2 mm long; style 11-17 mm long. Capsule 3.5-8 x 1.2-2 cm beaked, pale brown. Seeds 1-1.3 x 1.7-2.2 cm, including the wings.