This name is a synonym of Pergularia rostrata (R. Br.) Spreng..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 2601789) with original publication details: Mem. Wern. Nat. Hist. Soc. 1: 31 1810.
This name was in version 1 of The Plant List, record tro-2601789, and has not been changed.