The California Barrel Cactus (Echinocactus polycephalus) is a round, spiny cactus native to the deserts of the southwestern United States, particularly in California and Nevada. It typically grows to about 1 to 3 feet tall and can reach a width of 2 feet. The cactus is characterized by its ribbed surface and clusters of yellow or red flowers that bloom in the spring. This cactus is well-adapted to arid environments, storing water in its thick, fleshy tissues. It thrives in sandy or rocky soils and can often be found in Mojave Desert regions. The California Barrel Cactus is an important part of its ecosystem, providing food and shelter for various desert wildlife.