Mammillaria compressa (Mother of Hundreds) is a clump-forming cactus with cylindrical to club-shaped stems with spines that vary in length…
Derivation: Feminine form of "compressus," perfect passive participle of "comprimo."
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.