Synonyms
Echinocactus bulbocalyx Werderm.
Pyrrhocactus dubius Backeb.
Pyrrhocactus bulbocalyx (Werderm.) Backeb.
Pyrrhocactus umadeave var. marayesensis Backeb.
Neoporteria bulbocalyx (Werderm.) Donald & G.D.Rowley
Pyrrhocactus marayesensis (Backeb.) J.G.Lamb.
Neoporteria umadeave var. marayesensis (Backeb.) Donald & G.D.Rowley
Neoporteria dubia (Backeb.) Donald & G.D.Rowley