This name is a synonym of Phlox multiflora subsp. depressa (E.E. Nelson) Wherry.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50231279) with original publication details: Bull. Torrey Bot. Club 33(3): 149 1906.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:193425-2.
This name was in version 1 of The Plant List, record tro-50231279.