This name is a synonym of Dactylorhiza praetermissa var. junialis (Verm.) Senghas.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 465471) with original publication details: Ned. Kruidk. Arch. 56: 229 1949.
This name record (from WCSP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Dactylorchis praetermissa in version 1 of The Plant List.