External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:138282-2
- Publication
- Contributions from the United States National Herbarium. Smithsonian Institution
- Collation
- 12(10): 433
- Date of Publication
- 21 Jul 1909
- Family as entered in IPNI
- Cactaceae