This name is a synonym of Allium amplectens Torr..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 295085) with original publication details: Proc. Calif. Acad. Sci. 2: 110 1863.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:527647-1.
This name was in version 1 of The Plant List, record kew-295085, and has not been changed.