Euphorbia (spurge) is a large genus of succulent plants belonging to the Euphorbiaceae family. Many euphorbias are common and popular such as the Christmas Poinsettas, or the Crown of Thorns. Euphorbias from the deserts of Southern Africa and Madagascar are often incorrectly referred to as cacti because many have evolved similar physical characteristics. Though some are similarly ornamental, thorny and drought-tolerant, the euphorbias have a poisonous, milky, white latex-like sap, and unusual and unique kind of floral structures.