Euphorbia otjipembana, Leach, 1976

Swanepoel, Wessel, 2013, Euphorbia otjipembana subsp. okakoraensis (Euphorbiaceae), a new subspecies from the Kaokoveld, Namibia, with an amplified description of Euphorbia otjipembana, Phytotaxa 117 (2), pp. 51-57 : 53

Key to the subspecies of E. otjipembana (for more differences see Table 1)

1. Branches usually fresh (bright) green, rarely grey-green; spine shields 2.8–5.2 mm wide at apex, 1.5–2.6 times as long as broad; bracts on peduncle and cyme branches leaving prominent scars ............................. subsp. otjipembana

- Branches grey-green; spine shields 2–3 mm wide at apex, 2.7–4.4 times as long as broad; bracts on peduncle and cyme branches not leaving prominent scars ................................................................................... subsp. okakoraensis