Azolla caroliniana
 Azolla caroliniana (Carolina Azolla Carolina Mosquito Fern Water velvet) is a species of Azolla native to the Americas in eastern North America from southern Ontario southward and from the east coast west to Wisconsin and Texas and in the Caribbean and in Central and South America from southeastern Mexico (Chiapas) south to northern Argentina and Uruguay.It is a freshwater aquatic fern with scale-like fronds 5–10 mm long green to reddish most often reddish in strong light and in winter. 