Taxonomic status: Unresolved

homotypic synonyms:
Echinocactus johnsonii Parry ex Engelm.; Echinomastus johnsonii (Parry ex Engelm.) E.M. Baxter; Neolloydia johnsonii (Parry ex Engelm.) L.D. Benson; Sclerocactus johnsonii (Parry ex Engelm.) N.P. Taylor; Thelocactus johnsonii (Parry ex Engelm.) W.T.Marshall;

protologue: Cact. 3: 141 (1922)
URL protologue: https://archive.org/stream/mobot31753002274329#page/141/mode/2up

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