1.  floating fern(n = noun.plant) ceratopteris thalictroides - pantropical aquatic fern;
is a kind of aquatic fern, water fern
is a member of ceratopteris, genus ceratopteris

2.  floating fern(n = noun.plant) ceratopteris pteridioides, water sprite - aquatic fern of tropical America often used in aquariums;
is a kind of aquatic fern, water fern
is a member of ceratopteris, genus ceratopteris

3.  floating fern(n = noun.plant) azolla caroliniana, carolina pond fern, mosquito fern - small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe;
is a kind of aquatic fern, water fern
is a member of azolla, genus azolla

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