''Ariocarpus retusus'' is a species of cactus, from the genus ''

Ariocarpus ''Ariocarpus'' is a small genus of succulent, subtropical plants of the family Cactaceae. The name comes from the ancient Greek "aria" (an oak type) and "carpos" (=fruit) because of the resemblance of the fruit of the two genus in acorn form. A ...

'', found mainly in Mexico. It is one of the largest and fastest-growing species in this genus known for a slow rate of growth. Despite its slow growth, often taking ten years to reach flowering age, the ''retusus'' is a desirable cactus for cultivation, having attractive flowers and an unusual form for a cactus. It is also one of the most easily cultivated species in the genus.

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* * retusus Cacti of Mexico Endemic flora of Mexico Garden plants of North America {{Cactus-stub