Cleistocactus ritteri Backeb. in Kakteen And. Sukk. 10: 11, 163. 1959 Cleistocactus ritteri Backeb. in Kakteen And. Sukk. 10: 11, 163. 1959is basionym for Cephalocleistocactus ritteri (Backeb.) Backeb., Cactaceae 6: 3691. 1962Taxon for this nameCleistocactus ritteri Backeb.