Family of ferns
Salviniaceae (), is a family of heterosporous ferns in the order Salviniales. The Salviniaceae contain the two genera "Azolla" and "Salvinia", with about 20 known species in total. The oldest records of the family date to the Late Cretaceous. "Azolla" was previously placed in its own family, Azollaceae, but research has shown "Azolla" and "Salvinia" to be sister genera with the likely phylogenic relationship shown in the following diagram.
References.
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