Mammillaria compressa 'Yokan' is a strange small cactus that forms a densely packed cluster of crested, brownish-green to purplish-red …
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.