Echinocactus scopa var. candidus Pfeiff., Enum. Diagn. Cact.: 64. 1837
Echinocactus scopa var. candidus, Enum. Diagn. Cact.: 64. 1837
is basionym for Echinocactus scopa f. candidus, Handb. Kakteenkult.: 176. 1907
is basionym for Notocactus scopa f. candidus, Kakteen 18: C VIa. 1961