Tetracoccus (plant)

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.