This name is a synonym of Helictotrichon mortonianum (Scribn.) Henrard.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 397700) with original publication details: Bot. Gaz. 21: 133 1896.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:27191-2.
This name was in version 1 of The Plant List, record kew-397700, and has not been changed.