This name is a synonym of Polypogon mollis (Thouars) C.E.Hubb. & E.W.Groves.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 433520) with original publication details: Esquisse Fl. Tristan d'Acugna 37 1808.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:415633-1.
This name was in version 1 of The Plant List, record kew-433520, and has not been changed.