This name is a synonym of Platanthera grandiflora (Bigelow) Lindl..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 157163) with original publication details: Naturaliste Canad. 109: 277 1982.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:921318-1.
This name was in version 1 of The Plant List, record kew-157163.