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Blyxa
Blyxa auberti
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Egeria
Egeria densa
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Halophila
Halophila hawaiiana
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Hydrilla
Hydrilla verticillata - The Perfect Aquatic Weed
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Limnobium
Limnobium spongia
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Vallisneria
American Wildcelery Restoration, Vallisneria americana
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Description of Hydrocharitaceae
http://biodiversity.uno.edu/delta/angio/www/hydrocha.htm
Habit and leaf form; Anatomy; Morphology; Physiology; Biochemistry; Geography.