Melocactus violaceus subsp. ritteri N.P.Taylor
, Bradleya 9: 57 (1993).- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:1035272-2
- Publication
- Bradleya; Yearbook of the British Cactus and Succulent Society. Botley
- Collation
- 9: 57
- Family as entered in IPNI
- Cactaceae