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 294951) with original publication details: Fl. S.E. U.S. 1: 263 1903.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:527563-1.
This name was in version 1 of The Plant List, record kew-294951, and has not been changed.