The Genus Sebastiana consists of around 12 species of shrubs and trees that belong to the family Euphorbiaceae. These plants are native to the western United States and Mexico, and are commonly known as Sebastopolis, croton, or poison oak. The common name "Sebastopolis" translates to "City of Sebastian," which is a reference to Saint Sebastian, who was an early Christian martyr. The term "croton" is derived from the Greek word for "tick," due to the plant's resemblance to the parasitic insect. The name "poison oak" is a reference to the plant's irritating and toxic sap, which can cause a severe allergic reaction in some individuals.