Different plants seem to be carried under the name Echinodorus macrophyllus in aquaristics, but the name is also equivocal in science. True Echinodorus macrophyllus is distributed on the Atlantic coast of Brazil, and is probably not in cultivation.
Please see Echinodorus sp. "macrophyllus" for further details.
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[widget=aquaticplants/echinodorus-macrophyllus]Echinodorus macrophyllus[/widget]