This name is a synonym of Arrhenatherum longifolium (Thore) Dulac.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym and as an illegitimate name (record 397695) with original publication details: Fl. Lusit. 1: 109 1804.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:391595-1.
This name was in version 1 of The Plant List, record kew-397695.