:: Ariocarpus kotschoubeyanus -- This is the smallest of all the Ariocarpi, rarely exceeding 7cm.  It may be found in numerous states, including San Louis Potosi, Tamaulipas and Queretaro.

The Ariocarpus Kotschoubeyanus is named after its discoverer, Prince Kotschoubey.  It is characterized by wooly areoles which thin out at the tip of each tubercle.  Typically, the Ariocarpus Kotschoubeyanus develops magenta flowers that are usually larger than the plant itself.  However, a white-flowering form exists named Albiflora.  Recently, two different forms have been identified and granted their own status as Kotschoubeyanus varieties: Ariocarpus Kotschoubeyanus v Macdowellii and v Sladcovskyi. ::

Ariocarpus kotschoubeyanus

:: Ariocarpus agavoides -- This species is almost extinct and small populations may be found in small areas of San Louis Potosi and Tamaulipas - Mexico.

The species' epithet was adopted due to the plant's leaves looking like an Agave (agavoides = agave-looking).  The tubercles have a dark green epidermis and pointed tips.  The Ariocarpus agavoides produces large, diurnal magenta flowers. ::

Ariocarpus agavoides

:: Ariocarpus retusus ssp retusus -- This species is the largest of the genus, capable of reaching 25cm in diameter.  It is divided into two sub-species, ssp retusus and ssp trigonus.  The Ariocarpus retusus ssp retusus may be found in many areas of San Louis Potosi and Nuevo Leon.

Along with the Ariocarpus fissuratus, it is commonly called a 'living rock', due to its mimicry of its habitat.  Consequently, specimens slightly vary morphologically depending on their habitat.  Generally, the Ariocarpus retusus ssp retusus is characterized by long, pyramidal tubercles formed densely, varying from light to dark green in colour.  Most frequently tubercles are smooth, however minor wrinkling is visible in some forms.  The Ariocarpus retusus ssp retusus produces large diurnal white flowers. ::

Ariocarpus retusus ssp retusus

:: Ariocarpus bravoanus ssp hintonii

TAnother relatively new inclusion in the Ariocarpus genus.  The hintonii was originally included in the fissuratus species and was named after George Hinton, who discovered it.  The plant is endangered and may be found in only two locations in the state of San Louis Potosi.  The plant is characterized by generally shorter tubercles than the bravoanus sub-species and very distinct lateral grooves on the tubercles.  The Ariocarpus bravoanus ssp hintonii produces large pinkish flowers.. ::

Ariocarpus bravoanus ssp hintonii