Euphorbia derksenii, a New Waterberg Endemic of the Limpopo Province, South Africa.

During several visits to Zinnshoek farm situated in the northwestern Waterberg in the Limpopo Province, a Euphorbia was observed and documented from the dystrophic quarzitic sandstone outcrops. Plants were studied in habitat and cultivation. Living and herbarium specimens (PRE) were collected and grown at Kirstenbosch National Botanical Garden as well as Babylonstoren Farm and in the Oudtshoorn district. Plants illustrated herein by Gerhard Marx (G.M.). Geographical locations are cited according to the grid reference method of Edwards & Leistner (1971).