Thelocactus johnsonii (Parry ex Engelm.) W.T.Marshall in Cact. Succ. J. Gr. Brit. 9: 28. 1947 Thelocactus johnsonii (Parry ex Engelm.) W.T.Marshall in Cact. Succ. J. Gr. Brit. 9: 28. 1947is new combination for Echinocactus johnsonii Parry ex Engelm., Botany (Fortieth Parallel): 117. 1871Taxon for this nameThelocactus johnsonii (Parry ex Engelm.) W.T.Marshall