This name is a synonym of Clarkia purpurea subsp. viminea (Douglas) H.F.Lewis & M.R.Lewis.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50114961) with original publication details: Bot. Mag. 55: pl. 2873 1828.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:173527-2.
This name was in version 1 of The Plant List, record tro-50114961.