Mammillaria heyderi (Heyder's Pincushion Cactus) is a small cactus with a solitary, depressed globose stem with conical or pyramidal …
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Epithet: heyderi
Derivation: Honors Edward Heyder (1808-1884), a German cactus grower.
Pronunciation: HEY-der-eye
While the generic name must be unique, two or more genera often share the same specific epithet. Moreover, the same epithet can be used for subspecies, varieties, and forms within a species. Here is a list of plants that share this epithet.