This name is a synonym of Echinodorus longiscapus Arechav..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 305263) with original publication details: Anales Mus. Nac. Hist. Nat. Buenos Aires 27: 311 1915.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:88171-2.
This name was in version 1 of The Plant List, record kew-305263.