(Astrophytum myriostigma), species of cactus, family Cactaceae, native to Texas and central Mexico, with four or five distinct ribs that increase to eight or more with age. Otherwise spineless and globose, becoming cylindroid, it is covered with white flecks.

All four species of Astrophytum, which is sometimes regarded as a subgenus of Echinocactus, are cultivated as potted plants, their yellow flowers appearing on summer days. Fairly large, some are also fragrant.