Mammillaria mystax is a cactus with a flat-topped, globose to short cylindrical, usually solitary stem with pyramid-shaped tubercles, white…
Derivation: A Latin noun
Whereas the generic name must be unique, there are often two or more genera with the same specific epithet. The same epithet can also be used within a species for subspecies, varieties, and forms.
Here is a full list of succulents with this epithet. Click on the photo or the name of the plant for which you wish to see further information.