Many species of aquatic plants are informally grouped together as "algae", a term that can refer to species as diverse as single-celled cyanobacteria to multicellular Filamentous Green Algae.

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Some other larger plants include Duckweed, that floats on the water surface in still water areas. 

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Other plants such as Coontail or Watercress root themselves in the stream bed.

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Occasionally you might find Water Lillies in a quiet, deep backwater along the creek.

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There are other plants, although not technically aquatic, will be found along waterlogged shorelines and gravel beds. They include Water Milfoil and Water Primrose.