This name is a synonym of Dactylorhiza majalis subsp. occidentalis (Pugsley) P.D.Sell.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 55488) with original publication details: Watsonia 44: 368 1983.
This name was in version 1 of The Plant List, record kew-55488.