floating fern, n.
small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe
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Azolla caroliniana Carolina pond fern floating fern mosquito fern
aquatic fern of tropical America often used in aquariums
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Ceratopteris pteridioides floating fern water sprite
pantropical aquatic fern
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Ceratopteris thalictroides floating fern