The name of this magnificent cactaceae comes from the Greek "aria", which means "sorbo", and "karpos", which means "fruit", and refers to the fact that these plants have fruits similar to those of rowan. In the wild they grow in semi-arid zones. They are slow-growing and spineless plants, resembling rocks, characterized by stems and rosettes surrounded by fleshy, greyish-brown tubercles. The flowers are arranged in a crown on the top or develop in the center. It is a rare species at risk of extinction, much sought after by collectors.