Epithelantha

A species of western Texas and northeastern Mexico, recognised by its very dense covering of appressed spines. Its resemblance to young E. micromeris led to a hypothesis that it retains some juvenile traits.

An endemic of Coahuila with a narrow range. Similarity of plastid markers to E. micromeris coincides with differences in morphology and site conditions.

A cactus from Coahuila, also known under the older name E. micromeris subsp. greggii. Its sites lie in a relatively dry part of the genus's range, and the seeds examined are distinguished by the absence of detectable lignin.

A species from Nuevo León in the wetter part of the Epithelantha range, near the transition from the Chihuahuan Desert to Tamaulipan thornscrub.

A small cactus whose stem changes its spine covering as it matures. It has a broad range in the southwestern United States and northeastern Mexico. Studies cover its environment, stem development, cortical crystals and unusual seed chemistry.

A species from Coahuila, formerly included within E. micromeris. Site analysis associates it with foothill zones and calcareous soils in a dry climate.

An endemic of Coahuila formerly assigned to E. micromeris or E. greggii. In the environmental analysis, it occupied dry sites associated with fold mountains.

A species from San Luis Potosí, formerly E. greggii subsp. potosina. Its more southerly sites have weaker temperature seasonality than the environments of many northern Epithelantha.

A species from Nuevo León, initially described as a subspecies of E. pachyrhiza. In the environmental analysis, its sites were associated with luvic kastanozems.

A species from Coahuila and Nuevo León comprising two accepted subspecies. The site study associates it with luvic kastanozems and fold mountains.