Tree, up to 30 m high. Leaflets acute or acuminate and slightly retuse at apex, lanceolate to oblong or narrowly elliptic with 16-20 or more pairs of primary lateral veins. Flowers 4-merous, in terminal panicles. Flowers creamy white.
Like Z. capense but leaflets lanceolate, acute, with 16-20 pairs of veins.
Tree 8-30 m. tall; trunk armed with thorny bosses; branches glabrous, aculeate with aculei 1-5 mm long, straight or slightly curved upwards. Leaves 8-25 cm long; rhachis grooved above. Leaflets sessile, opposite or subopposite, (2)3-6-jugate, becoming progressively larger from the basal pair upwards to the apical one, terminal leaflet sometimes petiolulate or sometimes aborted; lamina 2-7 x 0.8-2.5 cm, lanceolate to narrowly elliptic and ± asymmetric, dotted with pellucid glands in the marginal sinuses only (in our area ), acuminate and slightly retuse at the apex, margin serrate or crenulate-serrate, cuneate or obtuse and slightly callose-auriculate at the base; nerves very numerous and rather closely spaced. Inflorescence of terminal panicles 4-6 cm long; bracts and bracteoles very small, caducous. Flowers 4-merous. Male flowers: pedicellate, with pedicels 1-1.5 mm long, usually in clusters at the ends of the panicle-branches; sepals 4, slightly united at the base, ovate, 0-6 mm long; petals 2.7 x 1.3 mm, imbricate, elliptic; stamens 4; filaments 3-5 mm long, linear; anthers dorsifixed, ovate, 1 mm long; gynophore very short, surmounted by the vestigial ovary. Female flowers: not seen from our area. Fruit 5 mm in diam., subsessile, gland-dotted. Seed globose, black, shiny.