Families list

 
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O

OLEANDRACEAE - Genera:2; Species:5 (Nephrolepis auriculata, Nephrolepis multiflora, Nephrolepis tuberosa, Nephrolepis undulata, Oleandra musifolia)

OPHIOGLOSSACEAE - Genera:3; Species:9 (Botrychium daucifolium, Botrychium lanuginosum, Helminthostachys zeylanica, Ophioglossum costatum, Ophioglossum gramineum, Ophioglossum nudicaule, Ophioglossum parvifolium, Ophioglossum pedunculosum, Ophioglossum reticulatum)