Families list

 
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O

OLEANDRACEAE - BROAD SWORD FERN FAMILY - Genera:1; Species:1; Family Photo Gallery (Oleandra musifolia)

OPHIOGLOSSACEAE - GRAPEFERN FAMILY - Genera:3; Species:14; Family Photo Gallery (Botrychium daucifolium, Botrychium lanuginosum, Helminthostachys zeylanica, Ophioglossum costatum, Ophioglossum eliminatum, Ophioglossum gramineum, Ophioglossum lancifolium, Ophioglossum lusitanicum, Ophioglossum oleosum, Ophioglossum parvifolium, Ophioglossum pendulum, Ophioglossum petiolatum, Ophioglossum polyphyllum, Ophioglossum reticulatum)

OSMUNDACEAE - OSMUNDA FAMILY - Genera:2; Species:3; Family Photo Gallery (Lygodium longifolium, Lygodium salicifolium, Osmunda hilsenbergii)