This member of the Euphorbiaceae family was given this name by Eugène Ursch and Jacques D. Leandri in 1955. It is found in in the coastal hills of Lac Bleu in north-eastern Madagascar, growing in a well drained soil with some water and not that much sun sun. The caudex can grow to four centimetres in diameter, the entire plant to 80 centimetres in height. The flowers are greenish white or reddish.
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 is named in honour of the French arachnologist Prof. Jacques Millot, 1897-1980. A large plant from Uhlig-kakteen.de.

