This name is a synonym of Allium columbianum (Ownbey & Mingrone) P.M.Peterson, Annable & Rieseberg.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 295462) with original publication details: Univ. Wash. Publ. Biol. 17(1): 747 1969.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:271934-2.
This name was in version 1 of The Plant List, record kew-295462, and has not been changed.