This name is a synonym of Asperula cynanchica subsp. occidentalis (Rouy) Stace.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 17000) with original publication details: Fl. France 8: 60 1903.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:744096-1.
This name was in version 1 of The Plant List, record kew-17000, and has not been changed.