This name is a synonym of Echinodorus floribundus (Seub.) Seub..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 305259) with original publication details: Brittonia 38: 330 1986.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:952996-1.
This name was in version 1 of The Plant List, record kew-305259, and has not been changed.