This name is a synonym of Phalaris caroliniana Walter.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25538515) with original publication details: Contr. U.S. Natl. Herb. 2(3): 512 1894.
This name was in version 1 of The Plant List, record tro-25538515, and has not been changed.