Flora van Nederland Haeckel (1866) - plants
   Division Pteridophyta Schimp. (1879) see Subphylum Pteridophytina (Eichler) Cavalier-Sm. (1998)
     Class Filicopsida C.Agardh (1822) - ferns see Class Polypodiopsida Cronquist, Takht. & Zimmerm. (1966)
       Family Azollaceae Wettst. (1903) see Family Salviniaceae Martinov (1820)
         Genus Azolla Lam. (1783)
           1 Azolla filiculoides Lam. (1783) - azolla
           2 Azolla caroliniana Willd. - Carolina mosquitofern