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 DA44F79D-EA05-442C-9B73-B756D7BE0204) with original publication details: 239 1957.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:148435-2.
This name was in version 1 of The Plant List, record gcc-113309.