This name is a synonym of Allium prattii C.H.Wright.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 295234) with original publication details: Repert. Spec. Nov. Regni Veg. 13: 339 1914.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:527766-1.
This name was in version 1 of The Plant List, record kew-295234, and has not been changed.