USDA Plants Database Species Count: 91 Aspleniaceae Athyriaceae Blechnaceae Cystopteridaceae Dennstaedtiaceae Dryopteridaceae Equisetaceae Isoetaceae Lycopodiaceae Marsileaceae Onocleaceae Ophioglossaceae Osmundaceae Polypodiaceae Pteridaceae Salviniaceae Selaginellaceae Thelypteridaceae Woodsiaceae |
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