⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record gcc-56354, with some changes.
This name is a synonym of Carduus occidentalis Nutt..
The record derives from TICA which reports it as a synonym (record 4C46C4D2-9AD6-438B-AD54-7DC9EB1DC336) with original publication details: Univ. Calif. Publ. Bot. 3 239 1907.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:45572-2.