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 276575) with original publication details: Anales Mus. Hist. Nat. Montevideo II, 2: 118 1925.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:88180-2.
This name was in version 1 of The Plant List, record kew-276575.