Matucana ritteri Buining in Succulenta (Netherlands) 1959: 2. 1959 sec. Hunt 2016
- ≡Submatucana ritteri (Buining) Backeb., Cactaceae 6: 3702. 1962 syn. sec. TROPICOS 1988+
- ≡Borzicactus ritteri (Buining) Donald in Natl. Cact. Succ. J. 26(1): 10. 1971 syn. sec. Hunt 2016