This name is a synonym of Platanthera michaelii (Greene) R.M.Bateman.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 156611) with original publication details: Bot. J. Linn. Soc. 75: 266 1977 publ. 1978.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:199608-2.
This name was in version 1 of The Plant List, record kew-156611.