A Common milkweed locust (Phymateus morbillosus) on Euphorbia heptagona in the Great Karoo, Eastern Cape, South Africa. [photo Colin Paterson-Jones ©]

Euphorbia heptagona flowering in winter on shale ground strewn with Witteberg quartzite stones on a plateau on the farm Rondekop south of Laingsburg, Western Cape, South Africa. [photo Colin Paterson-Jones ©]

Euphorbia heptagona growing on a steep bank of the Groot River on the north side of the Langeberg Mountains, Western Cape, South Africa. [photo Colin Paterson-Jones ©]