Echinomastus johnstonii (Parry ex Engelm.) E.M.Baxter, Calif. Cactus: 75. 1935 Echinomastus johnstonii (Parry ex Engelm.) E.M.Baxter, Calif. Cactus: 75. 1935is new combination for Echinocactus johnsonii Parry ex Engelm., Botany (Fortieth Parallel): 117. 1871Taxon for this nameEchinomastus johnstonii (Parry ex Engelm.) E.M.Baxter