Epithelantha (button cactus) is a genus of cactus that is native to north-eastern Mexico, and the south-western United States from western Texas to Arizona.

The name Epithelantha refers to the flower position near the apex of the tubercles.

[1] Epithelantha are very small cacti with globe-shaped or cylindrical stems typically up to one inch in diameter, rarely reaching two inches long.

Tiny whitish spines completely cover the surface of the stem.

[citation needed] As of January 2021[update], Plants of the World Online accepted eight species:[3]