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 305294) with original publication details: Folia Geobot. Phytotax. 5: 213 1970.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:88191-2.
This name was in version 1 of The Plant List, record kew-305294, and has not been changed.