Echinocactus rettigii Quehl in Monatsschr. Kakteenk. 29: 129. 1919
Echinocactus rettigii in Monatsschr. Kakteenk. 29: 129. 1919
is basionym for Borzicactus hempelianus var. rettigii in Natl. Cact. Succ. J. 25: 71. 1970
is basionym for Arequipiopsis rettigii in Repert. Spec. Nov. Regni Veg. 50: 188. 1941
is basionym for Oreocereus rettigii in Krainz, Kakteen 55-56: CVc. 1973
is basionym for Arequipa rettigii in Cactaceae (Berlin) 1940(2): 21. 1940