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 9211DDAA-3EAE-4F2F-AF70-4D1A58872427) with original publication details: 109 1845.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:297225-2.
This name was in version 1 of The Plant List, record gcc-41640.