External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:174898-2
- Publication
- Report (Annual) of the Missouri Botanical Garden. St. Louis
- Collation
- 20: 90, pls. 2, 6, 12, 13
- Family as entered in IPNI
- Cactaceae
Type Information
- Distribution Of Types
- Arizona (Southwestern U.S.A., Northern America)