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 and as an illegitimate name (record 433549) with original publication details: Revista Argent. Agron. 4: 298 1937.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:192271-2.
This name was in version 1 of The Plant List, record kew-433549, and has not been changed.