External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:30000026-2
- Publication
- Memoir of a Tour to Northern Mexico: connected with Col. Doniphan's expedition, in 1846 and 1847; with a scientific appendix and three maps. Washington, DC
- Collation
- 109
- Family as entered in IPNI
- Cactaceae