Ariocarpus kotschoubeyanus

Is the smallest member of the genus. It frequents fine, flat clay-sandy sediments or gravel mixed with clayey sand. The tuberculate rosettes measure 5 to 7 cm. A white-flowered variety occurs in Mecixo in Tamaulipas, while the varieties from central Mexico, from the states of San luis Potosí and Querétaro, have carmine blossoms.

Ariocarpus trigonus

Has a flattened, bright green body composed of numerous tubercles. Unlike the preceding species, the epidermis has a flash green colouration and the flowers are yellow, in larger specimens growing around the outer edge of the top of the plant body. In the wild, this cactus grows under shrubs protected from the sun, but in cultivation, it also requires warmth and careful watering.