This name is a synonym of Allium cernuum Roth.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 296179) with original publication details: J. Wash. Acad. Sci. 15: 370 1925.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:8833-2.
This name was in version 1 of The Plant List, record kew-296179, and has not been changed.