This name is a synonym of Dactylorhiza majalis subsp. baltica (Klinge) H.Sund..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 55173) with original publication details: Konsp. Fl. Pskov. Obl., Leningrad 57 1970.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:626579-1.
This name was in version 1 of The Plant List, record kew-55173.