⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record gcc-31629, with some changes.
This name is a synonym of Carduus occidentalis Nutt..
The record derives from TICA which reports it as a synonym (record 1718C9DB-D81B-4912-8FCD-3AA28372D143) with original publication details: Fl. W. Mid. Calif. 509. 509 1901.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:59091-2.