riverweed

[riv-er-weed]
noun
any of several chiefly tropical submerged aquatic plants of the genus Podostemum and related genera, growing in rapidly moving streams.

Origin:
1665–75; river1 + weed1

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There was a faint, sharp smell of mud and riverweed.
The alligator snapping turtle, hellbender, and riverweed are also rare species restricted to this area.
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