http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=10025
With the following edits
Echinodorus cordifolius subsp. cordifolius (=Echinodorus cordifolius)
Echinodorus floridanus (=Echinodorus grandiflorus)
Echinodorus tenellus (=Helanthium tenellum)
Sagittaria graminea chapmanii (=Sagittaria chapmanii)