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 296693) with original publication details: Beih. Bot. Centralbl. 28(2): 512 1911.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:528933-1.
This name was in version 1 of The Plant List, record kew-296693, and has not been changed.