This name is a synonym of Phlox walteri (A. Gray) Chapm..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50097262) with original publication details: Manual (ed. 2) 331 1856.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:193635-2.
This name was in version 1 of The Plant List, record tro-50097262, and has not been changed.