Larrea tridentata
The Sonoran Province comprises arid areas in the southwestern U.S. and northwestern Mexico from California and Baja California to Texas and Tamaulipas, including the Mojave (characterized by "Yucca brevifolia", Joshua Tree), Sonora and Chihuahua Deserts. The vegetation is dominated by "Yucca", Cactaceae species ("Opuntia" spp. and other), as well as by "Larrea tridentata" (Creosote bush).