[APD] Help with Identification

[dbertot at pluspetrol_net]

Hi everyone, I'm Diego from Argentina.
A fellow aquarist has collected some aquatic plants in a lagoon near the
Orinoco river in Venezuela.
We are certain that this is a tonina fluviatilis
http://i53.photobucket.com/albums/g57/mandamiuno/CloseUp.jpg
But we cannot identify this plant:
http://i53.photobucket.com/albums/g57/mandamiuno/HPIM1063.jpg
http://i53.photobucket.com/albums/g57/mandamiuno/HPIM1064.jpg
http://i53.photobucket.com/albums/g57/mandamiuno/HPIM1065.jpg
http://i53.photobucket.com/albums/g57/mandamiuno/HPIM1066.jpg
We think that it's a Heteranthera but we have doubts about the species.
Many thanks in advance for your answers.
Best regards
Diego Bertot
Argentina

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