Euphorbia milii, the crown of thorns, Christ plant, or Christ thorn, is a species of flowering plant in the spurge family Euphorbiaceae, native to Madagascar. The species name commemorates Baron Milius, once Governor of Réunion, who introduced the species to France in 1821.

Scientific name: Euphorbia milii
Family: Euphorbiaceae
Kingdom: Plantae
Order: Malpighiales
Lowest temperature: 35 degrees Fahrenheit