This name is a synonym of Dactylorhiza fuchsii subsp. okellyi (Druce) Soó.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 142979) with original publication details: Bot. Soc. Exch. Club Brit. Isles 4: 108 1914 publ. 1915.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:648935-1.
This name was in version 1 of The Plant List, record kew-142979, and has not been changed.