#genus_Azolla__Azolla  a genus of fern sometimes placed in its own family Azollaceae
  supertype:  fern_genus  genera of ferns and fern allies
  member of:  family_Salviniaceae
  member:  mosquito_fern__floating_fern__Carolina_pond_fern__Azolla_caroliniana  small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe

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