Euphorbia regis-jubae is a species of flowering plant in the family Euphorbiaceae, native to the eastern Canary Islands, western Morocco, north-western Western Sahara. The specific epithet honours the contributions of King Juba II to natural history and his role in bringing the genus to notice. In Spanish, it is known as tabaiba morisca. It has often been confused with Euphorbia lamarckii.