This name is a synonym of Rostraria festucoides (Link) Romero Zarco.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 397822) with original publication details: Fl. Napol. Prodr. App. 4 v 1823.
This name was in version 1 of The Plant List, record kew-397822.