azolla caroliniana

Noun
  1. Small free-floating aquatic fern from the eastern United States to tropical America;
    Naturalized in western and southern Europe (synset 112980298)
    is a type of: aquatic fern, water fern - ferns that grow in water
    belongs to: azolla, genus azolla - a genus of fern sometimes placed in its own family Azollaceae
    same as: carolina pond fern, floating fern, mosquito fern

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