- floating fern, water sprite, Ceratopteris pteridioides - aquatic fern of tropical America often used in aquariums
--1 is a kind of aquatic fern, water fern
--1 is a member of Ceratopteris, genus Ceratopteris - water sprite, water nymph - a fairy that inhabits water
--2 is a kind of fairy, faery, faerie, sprite
--2 has particulars: undine