This name is a synonym of Phlox longifolia subsp. brevifolia (A. Gray) H. Mason.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50109892) with original publication details: Proc. Amer. Acad. Arts 8: 255 1870.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:293382-2.
This name was in version 1 of The Plant List, record tro-50109892.