Euphorbia mamillaris
Encyclopedia
Euphorbia mamillaris (also spelled Euphorbia mammillaris) is a plant species
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 native to South Africa
South Africa
The Republic of South Africa is a country in southern Africa. Located at the southern tip of Africa, it is divided into nine provinces, with of coastline on the Atlantic and Indian oceans...

. It grows up to 18 cm in height, with succulent stems covered with gray spines.
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