This name is a synonym of Deschampsia elongata (Hook.) Munro.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 407521) with original publication details: Rep. Princeton Univ. Exped. Patagonia, Botany 8(1): 200 1904.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:78048-2.
This name was in version 1 of The Plant List, record kew-407521.