This name is a synonym of Dactylorhiza lapponica subsp. angustata (Arv.-Touv.) Kreutz.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 55233) with original publication details: Naturalistes Belges 69: 52 1988.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:973004-1.
This name was in version 1 of The Plant List, record kew-55233, and has not been changed.