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 274749) with original publication details: Fl. W. Calif. 120 1901.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:8683-2.
This name was in version 1 of The Plant List, record kew-274749, and has not been changed.