Contemporary Circumscription Compared with A Utah Flora 4th ed.

Bio430

Salviniaceae

No difference.  Flora of North America separates Azolla into its own family, but data favors a single family.

Key Features

Leptosporangiate aquatic ferns that are free floating, have dichotomous branched stems, and fronds that are entire and minute or oval-shaped.  These heterosporous ferns have separate micro- and mega-sporocarps (each sporocarp contains only micro- or only megasporangia).