Rathbunia pruinosa (Otto ex Pfeiff.) P.V.Heath in Calyx 2: 104. 1992 Rathbunia pruinosa (Otto ex Pfeiff.) P.V.Heath in Calyx 2: 104. 1992is new combination for Echinocactus pruinosus Otto ex Pfeiff., Enum. Diagn. Cact.: 54. 1837Taxon for this nameRathbunia pruinosa (Otto ex Pfeiff.) P.V.Heath