This name is a synonym of Xylorhiza glabriuscula Nutt..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 0C4D9ABF-6D31-41C2-BDB9-F024876C7CF8) with original publication details: 212 1874.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:181942-1.
This name was in version 1 of The Plant List, record gcc-138219.