Noun: Azolla caroliniana
- Small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe
"Azolla caroliniana formed a purple carpet on the pond's surface";
- mosquito fern, floating fern, Carolina pond fern
Type of: aquatic fern, water fern
Part of: Azolla, genus Azolla
Encyclopedia: Azolla caroliniana