This name is a synonym of Phlox alyssifolia subsp. collina (Rydb.) Wherry.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50089947) with original publication details: Mem. New York Bot. Gard. 1: 316–317 1900.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:193411-2.
This name was in version 1 of The Plant List, record tro-50089947.