Salviniaceae
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Salviniaceae (Template:IPAc-en),<ref>Template:Cite book</ref><ref>Template:Cite Merriam-Webster</ref> is a family of heterosporous ferns in the order Salviniales.<ref name=Smith-2006/> The Salviniaceae contain the two genera Azolla and Salvinia,<ref name=Christenhusz-2011b/> with about 20 known species in total.<ref name="Christenhusz-Byng2016">Template:Cite journal</ref> The oldest records of the family date to the Late Cretaceous.<ref>Template:Cite journal</ref> 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.<ref name=Nagalingum-2008/>