Thelocactus hexaedrophorus var. droegeanus (Schelle) Pilbeam, Cactus File Handb. 1: 29. 1996
Thelocactus hexaedrophorus var. droegeanus, Cactus File Handb. 1: 29. 1996
is new combination for Echinocactus hexaedrophorus var. droegeanus, Handb. Kakteenkult.: 199. 1907