Astrophytum asterias is a species of cactus in the genus Astrophytum, and is native to small parts of Texas in the United States and Mexico. Common names include sand dollar cactus, sea urchin cactus, star cactus and star peyote.
The flowers of this cactus are yellow with red bases and the outer parts are very woolly. Green to pink oval fruits are produced; the outside coat is covered with woolly hairs. Astrophytum asterias is a small, spineless cactus with a stem that grows up to 2.4 inches (6 cm) tall and up to 6 inches (15 cm) in diameter.