Trichocereus santiaguensis (Speg.) Backeb., Cactaceae 2: 1107. 1959 Trichocereus santiaguensis (Speg.) Backeb., Cactaceae 2: 1107. 1959is new combination for Cereus santiaguensis Speg. in Anales Mus. Nac. Buenos Aires, ser. 3, 4: 478. 1905Taxon for this nameTrichocereus santiaguensis (Speg.) Backeb.