Escobaria tuberculosa), the corncob cactus, is a species of flowering plant in the family Cactaceae, native to the south-central United States, and northern Mexico.

The four to eight yellow, straight central spines have a pink or red tip and are 1 to 2 centimeters long.

The approximately 20 to 30 yellow, white or gray marginal spines are straight and spread out.

[5] The specific epithet tuberculosa comes from Latin, means 'humpy', and refers to the bumpy shoots of the species.

Nathaniel Lord Britton and Joseph Nelson Rose placed the species in the genus Escobaria in 1923.