This name is a synonym of Phalaris platensis Henrard ex Heukels.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 433388) with original publication details: Revista Sudamer. Bot. 9: 105 1953.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:289931-2.
This name was in version 1 of The Plant List, record kew-433388, and has not been changed.