Tetracoccus is a plant genus under the family Picrodendraceae. Shrubby-spurge is a common name for plants in this genus. They are dioecious, often hairy shrubs. It was first described in 1885 by Charles Christopher Parry. Its name means, from Greek "four seed" (tetra meaning "four" and kokkos, "kernel, grain"). Distribution The genus is native to the southwestern United States and northern Mexico, with species in desert or chaparral habitats. Species Species include: Tetracoccus capensis (I.M.Johnst.) Croizat — endemic to Baja California Sur state (México). Tetracoccus dioicus Parry — endemic to the Peninsular Ranges in northwestern Baja California state (México); and southern California (U.S.) within San Diego, Orange, and Riverside Counties. Tetracoccus fasciculatus (S.Watson) Croizat — Mexico (Chihuahua, Durango, Nuevo León, and Puebla states). Tetracoccus hallii Brandegee — Mojave Desert and Sonoran Desert in California, Nevada, and Arizona (U.S.), and Baja California state (México). Sometimes treated as a variety under T. fasciculatus. Tetracoccus ilicifolius Coville & Gilman — endemic to Death Valley National Park, in the Mojave Desert and eastern Inyo County, California. See also Taxonomy of the Picrodendraceae References External links Picrodendraceae Malpighiales genera Flora of Northeastern Mexico Flora of Northwestern Mexico Flora of the Southwestern United States Taxa named by George Engelmann Taxa named by Charles Christopher Parry Dioecious plants