This name is a synonym of Erythronium idahoense H.St.John & G.N.Jones.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 305766) with original publication details: Fl. S.E. Wash. 61 1914.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:96819-2.
This name was in version 1 of The Plant List, record kew-305766.