Taxonomic status: Unresolved

homotypic synonyms:
Echinocactus mammillarioides Hook.; Malacocarpus mammillarioides (Hook.) Britton & Rose; Pyrrhocactus mammillarioides (Hook.) Backeb.;

protologue: Kakteenkunde 5: 81 (1939)
URL protologue: https://archive.org/stream/#page/81/mode/2up

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