Taxonomic status: Synonym

homotypic synonyms:
Echinocactus johnsonii Parry ex Engelm.; Echinomastus johnsonii (Parry ex Engelm.) E.M. Baxter; Ferocactus johnsonii (Parry ex Engelm.) Britton & Rose; Sclerocactus johnsonii (Parry ex Engelm.) N.P. Taylor; Thelocactus johnsonii (Parry ex Engelm.) W.T.Marshall;

protologue: Cacti Arizona, ed. 3 25: 25 (1969)
URL protologue: https://archive.org/stream/#page/25/mode/2up

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