Euphorbia rhombifolia  Euphorbia rhombifolia is a species of Euphorbia indigenous to Namibia and South Africa, where it is widespread in clay-rich soils, extending as far east as Kwazulu-Natal. It grows to 60 or 70cm in height, with a tuberous root-system that is often eaten by porcupines, and with thin (3-5mm), erect, grey, branching stems. The branches are dichotomous and taper to soft points. The plants in the south-western Cape ("E. caterviflora") are smaller, reaching only 30cm in height. The leaves are small (1-3mm), dark, triangular and deciduous. The flowerheads are also small (3mm) and appear from winter into spring. This species is part of a group of closely related "stick euphorbias" including "Euphorbia burmannii" and "Euphorbia tenax", which are widespread across southern Africa.