Kingdom: Plantae
Clade: Pteridophytes
Class: Polypodiopsida
Order: Salviniales
Family: Salviniaceae
Salviniaceae is a family of heterosporous ferns in the order Salviniales. The Salviniaceae contain the two genera Azolla and Salvinia, with a total of ca 20 known species. Azolla was previously placed in its own family, Azollaceae, but recent research has shown Azolla and Salvinia to be sister genera. Wikipedia
Genera: Azolla, Salvinia
References:
Wikipedia
Wikipedia