Pyrrhocactus sanjuanensis (Speg.) Backeb., Cactaceae 3: 1573. 1959 Pyrrhocactus sanjuanensis (Speg.) Backeb., Cactaceae 3: 1573. 1959is new combination for Echinocactus sanjuanensis Speg. in Anales Mus. Nac. Buenos Aires, ser. 3, 4: 501. 1905Taxon for this namePyrrhocactus sanjuanensis (Speg.) Backeb.