This name is a synonym of Dactylorhiza × dinglensis (Wilmott) Soó.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 142449) with original publication details: Proc. Linn. Soc. London 148, 128 1936.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:648563-1.
This name was in version 1 of The Plant List, record kew-142449, and has not been changed.