This name is a synonym of Erythronium oregonum Applegate.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 305764) with original publication details: Contr. Dudley Herb. 1: 189 1933.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:96817-2.
This name was in version 1 of The Plant List, record kew-305764, and has not been changed.