A. asterias A. capricorne A. caput-medusae A. coahuilense A. myriostigma A. ornatum[2] Astrophytum is a genus of six species of cacti, native to North America.

[2] These species are sometimes referred to as living rocks, though the term is also used for other genera, particularly Lithops (Aizoaceae).

The species of the genus Astrophytum usually grow individually with spherical to columnar green shoots and reach heights of up to 1.5 meters.

The shoots are often densely covered with fine white tufts of hair, but sometimes they are completely bald.

There are four to ten (rarely three) very noticeable ribs that are not divided into cusps.