Tephrocactus ignotus (Britton & Rose) Backeb., Kaktus-ABC: 111. 1936 ["1935"] Tephrocactus ignotus (Britton & Rose) Backeb., Kaktus-ABC: 111. 1936 ["1935"]is new combination for Opuntia ignota Britton & Rose, Cactaceae 1: 99. 1919Taxon for this nameTephrocactus ignotus (Britton & Rose) Backeb.