Mammillaria heyderi (Heyder's Pincushion Cactus) is a small cactus with a solitary depressed globose stem with conical or pyramidal…
Derivation: Honors Edward Heyder (1808-1884), a German cactus grower.
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.