External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:328948-2
- Publication
- Proceedings of the American Academy of Arts and Sciences. Boston, MA
- Collation
- 3: 289, 302
- Date of Publication
- post 27 May 1856
- Family as entered in IPNI
- Cactaceae
Type Information
- Type Name
- O. clavata Engelmann
Nomenclatural Notes
Syn. Cact. U. S. 33, 46. post 27 May 1856.