This name is a synonym of Clarkia arcuata (Kellogg) A.Nelson & J.F.Macbr..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50114950) with original publication details: Proc. Calif. Acad. Sci. 1: 58 1855.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:613526-1.
This name was in version 1 of The Plant List, record tro-50114950, and has not been changed.