External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:175100-2
- Publication
- Madrono; Journal of the California Botanical Society
- Collation
- 20: 256
- Family as entered in IPNI
- Cactaceae
Type Information
- Distribution Of Types
- Galapagos Islands (Ecuador, Western South America, Southern America)