This name is a synonym of Bromus hordeaceus L..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 400582) with original publication details: Nouv. Fl. Belg. ed. 5: 1047 2004.
This name record (from WCSP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Bromus hordeaceus in version 1 of The Plant List.