This name is a synonym of Echinodorus uruguayensis Arechav..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 305268) with original publication details: Folia Geobot. Phytotax. 5: 214 1970.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:58338-1.
This name was in version 1 of The Plant List, record kew-305268, and has not been changed.