External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:60432239-2
- Publication
- Bradleya; Yearbook of the British Cactus and Succulent Society. Botley
- Collation
- 21: 89 (11 Aug. 2003)
- Family as entered in IPNI
- Cactaceae