This name is a synonym of Spartina maritima (Curtis) Fernald.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25541096) with original publication details: Enum. Brit. Grasses 46 1787.
This name was in version 1 of The Plant List, record tro-25541096, and has not been changed.