Echinocactus hexaedrophorus var. droegeanus Schelle, Handb. Kakteenkult.: 199. 1907
Echinocactus hexaedrophorus var. droegeanus, Handb. Kakteenkult.: 199. 1907
is basionym for Thelocactus hexaedrophorus var. droegeanus, Cactus File Handb. 1: 29. 1996