Mammillaria senilis is a small, basally branching cactus that forms a clump of globose to cylindrical stems with conical tubercles and…
Meaning: Of or pertaining to old people; aged, senile.
Derivation: A Latine adjective.
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.