This name is a synonym of Allium longisepalum Bertol..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 295532) with original publication details: Bull. Soc. Bot. France 66: 290 1919.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:528018-1.
This name was in version 1 of The Plant List, record kew-295532, and has not been changed.