This member of the Euphorbiaceae family was given this name by George Bentham in 1839. It is found in northern and central Mexico, Arizona and Texas, growing in a well drained soil with little to some water and lots of sun. The caudex can grow to three centimetres, the plant up to fifteen centimetres. The flowers are white.
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 from Latin radiante; 'like the spoken of the wheel' for the spination. A wild plant from Calphotos.berkeley.edu.

