Euphorbia cooperi N.E.Br. ex A.Berger

Tree to 9(–12) m. high, or occasionally a shrub to ± 2 m. high; trunk simple, to 35 cm. thick, bark greyish brown, rough and fissured, with whorls of 4–9 pit-scars resulting from fallen branches; branches curving upwards, to 2.5 m. long, occasionally rebranching to form a rounded, flat-topped crown, fleshy, (3–)4–6(–8)-angled, 5–20 cm. wide, distinctly winged, deeply constricted at ± regular intervals into pear-shaped to subcircular segments 10–50 cm. long; angles shallowly sinuately toothed, with teeth ± regularly spaced 5–25 mm. apart.. Spine-shields contiguous to form a horny margin 3–10 mm. wide, becoming corky on older branches; spines 3–10 mm. long, or occasionally to 30 mm. on the lower branches; prickles vestigial or absent.. Leaves deltoid, ± 1.5 × 1.5 mm.. Cymes 1–3 in a horizontal row, 1-forked, subsessile; bracts rounded, ± 4.5 × 6.5 mm.. Cyathia ± 4.5 × 8 mm., with cup-shaped involucres; glands transversely oblong, ± 1.5 × 4 mm., just touching, golden yellow; lobes subquadrate, ± 1.5 × 2 mm.. Male flowers: bracteoles very deeply laciniate, plumose; stamens 6.8 mm. long.. Female flower: perianth obvious, shallowly lobed; styles 2–5.5 mm. long, joined for 1/2–2/3, apices thickened, rugulose, ± bifid.. Capsule exserted on a stout pedicel 4–10 mm. long, distinctly 3-lobed, with truncate base, 6–7.5 × 10–13.5 mm.. Seeds subglobose, 2.8–3.5 mm. in diameter, pale greyish brown, speckled, smooth.

Wooded grassland and on rocky hillsides, usually forming colonies, at elevations from 200-1,500 metres.

Can be grown by cuttings or seedlings. Seeds needs soaking.