This name is a synonym of Cirsium perplexans (Rydb.) Petr..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 8613EE7F-2F6F-43C2-B2CE-E144FE51ADD2) with original publication details: Bull. Torrey Bot. Club 32 132 1905.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:45581-2.
This name was in version 1 of The Plant List, record gcc-131599, and has not been changed.