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Eichhornia
Eichhornia crassipes, Eichhornia azurea, Eichhornia diversifolia
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Heteranthera
Heteranthera dubia
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Pontederia
Pontederia cordata, Pontederia sp.
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Description of Pontederiaceae
http://biodiversity.uno.edu/delta/angio/www/ponteder.htm
Habit and leaf form; Anatomy; Morphology; Physiology; Biochemistry; Geography.