This name is a synonym of Phlox kelseyi subsp. salina (M.E. Jones) Wherry.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50325933) with original publication details: Contr. W. Bot. 13: 3 1910.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:193462-2.
This name was in version 1 of The Plant List, record tro-50325933.