Pyrrhocactus deherdtianus (Backeb.) Katt. in Cact. Succ. J. (Los Angeles) 55: 123. 1983 Pyrrhocactus deherdtianus (Backeb.) Katt. in Cact. Succ. J. (Los Angeles) 55: 123. 1983is new combination for Neochilenia deherdtiana Backeb., Descr. Cact. Nov. 3: 9. 1963Taxon for this namePyrrhocactus deherdtianus (Backeb.) Katt.