Subspecies, varieties, forms and cultivars of plants belonging to the

• Euphorbia ritchiei (P.R.O.Bally) Bruyns: (subsp. ritchiei) has longer pale green, decumbent stems to 60 cm tall and 3 cm wide with tubercles in loosely spiralled series. Has puberulous leaves. Bract-cup greyish green. Distribution: Meru District. SW. of Isiolo.
• Euphorbia ritchiei subs. marsabitensis (S.Carter) Bruyns: has darkish green stems, branching from the base, rhizomatous and decumbent to 25 cm long and only 2 cm thick. Leaves puberolous. Distribution: Kenya. Northern Frontier Province: Marsabit.
• Euphorbia ritchiei subs. nyambensis (S.Carter) Bruyns: is a dwarf subspecies with short, very knobby pale green stems, erect to 15 cm high and to 3 cm thick. Leaves glabrous. Bract-cup and cyathia entirely deep pink. Distribution: Meru Distr. NE end of Nyambeni Hills, lagadema Hill.