This name is a synonym of Dactylorhiza purpurella (T.Stephenson & T.A.Stephenson) Soó.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 55486) with original publication details: Bot. J. Linn. Soc. 76: 367 1978.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:887445-1.
This name was in version 1 of The Plant List, record kew-55486.