⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record gcc-94481, with some changes.
This name is a synonym of Carduus occidentalis Nutt..
The record derives from TICA which reports it as a synonym (record 4007BC16-A1E0-41B6-A5D0-8D0F0AB1B091) with original publication details: 404 1887.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:61790-2.