This name is a synonym of Gahnia grandis (Labill.) S.T.Blake.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 265384) with original publication details: Voy. Rech. Pérouse 146 1800.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:153299-3.
This name was in version 1 of The Plant List, record kew-265384.