This name is a synonym of Phlox bifida var. cedaria (Brand) Fernald.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50205111) with original publication details: Pflanzenr. 27[IV,250]: 75 1907.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:193687-2.
This name was in version 1 of The Plant List, record tro-50205111.