Salviniales
Botany: aquatics, floating.
Salviniaceae: 2 genera, Azolla, Salvinia
Taxonomy
Marsileaceae: Marsilea, Pilularia, Regnellidium
Genera
Marsilea: Water clover; Four-leaf clover.
Azolla: Mosquito fern; Duckweed fern; Fairy moss; Water fern; 7 species; aquatic fern, resembling duckweed or some mosses.