This member of the Euphorbiaceae family was given this name by André Guillaumin in 1934. It is found in the south-eastern Madagascar, growing in a well drained soil with some water and lots of sun. The swollen roots can grow to seven centimetres in diameter, and the vertical growing stems up to 30 centimetres long. The flowers are from white over pale yellow to red.
The genera name; Euphorbia dates back to the first century BC, where King Juba II of Mauritania used it in a reference to his doctor, Euphorbos, and that name was kept as a generic name by Carl von Linnaeus. The species name after Raymond Decary, 1892-1973, a French botanist and anthropologist.

