This name is a synonym of Helictotrichon macrostachyum (Balansa ex Coss. & Durrieu) Henrard.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 397671) with original publication details: Bull. Soc. Bot. France 1: 318 1855.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:391571-1.
This name was in version 1 of The Plant List, record kew-397671, and has not been changed.