This name is a synonym of Xylorhiza tortifolia (Torr. & A.Gray) Greene.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record DFBAD1F1-093C-4F91-A7D7-7018114D5794) with original publication details: 18 1932.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:289888-2.
This name was in version 1 of The Plant List, record gcc-81558.