This name is a synonym of Dactylorhiza maculata subsp. ericetorum (E.F.Linton) P.F.Hunt & Summerh..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 55438) with original publication details: Nom. Nov. Gen. Dactylorhiza 7 1962.
This name was in version 1 of The Plant List, record kew-55438, and has not been changed.