Abstract
Euphorbia otjipembana was hitherto only known from the type locality within the Kaokoveld Centre of Endemism, northwestern Namibia. Subsequently several additional populations were discovered, allowing for an amplified description of the species and the recognition of two subspecies. Euphorbia otjipembana subsp. okakoraensis, here described as a new subspecies, is only known from a small area within the Kaokoveld Centre. Diagnostic characters for subsp. okakoraensis include a shrubby habit and medium (up to 1 m) height, 5–7-angled, scarcely constricted branches with two pairs of spines per node and single cymes comprising of three horizontally arranged cyathia. A key as well as a comparative table with diagnostic morphological characters to distinguish between the two subspecies of E. otjipembana is provided.
Highlights
At present three described species of medium-sized, shrubby succulent Euphorbia Linnaeus (1753: 450), belonging to subgenus Euphorbia section Euphorbia, are known from the Namibian part of the Kaokoveld (Leach 1976, Bruyns 2006)
Euphorbia otjipembana Leach (1976: 29) was hitherto only known from the type locality near Otjipemba in the northern Kaokoveld (Leach 1976, Craven 1999, Germishuizen & Meyer 2003)
During subsequent expeditions to the same general area, additional populations of E. otjipembana were found in the Otjihipa and Omavanda Mountains, which are situated to the west and east of Otjipemba respectively
Summary
At present three described species of medium-sized (up to 1 m tall), shrubby succulent Euphorbia Linnaeus (1753: 450), belonging to subgenus Euphorbia section Euphorbia, are known from the Namibian part of the Kaokoveld (Leach 1976, Bruyns 2006). Euphorbia otjipembana Leach (1976: 29) was hitherto only known from the type locality near Otjipemba in the northern Kaokoveld (Leach 1976, Craven 1999, Germishuizen & Meyer 2003). In this contribution a new subspecies of E. otjipembana is described and an amplified description of the species is provided.
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