Names starting with 'O'
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Obregonia (1 taxon)
Ochna (2 taxa, 3 obsolete names)
Ocimum (2 taxa, 1 obsolete name)
Odontadenia (1 taxon, 2 obsolete names)
Odontonema (1 taxon)
Odontospermum (1 obsolete name)
Odostemon (6 obsolete names)
Oehmea (2 obsolete names)
Oenothera (6 taxa, 9 obsolete names)
Olea (1 taxon, 2 obsolete names)
Oliverella (1 obsolete name)
Olneya (1 taxon)
Olyra (2 obsolete names)
Omiltemia (1 taxon)
Omphalodes (1 taxon)
Oncostema (1 taxon)
Onoclea (1 taxon, 2 obsolete names)
Onoseris (1 taxon)
Operculicarya (2 taxa)
Operculina (1 obsolete name)
Ophioglossum (1 obsolete name)
Ophiopogon (3 taxa, 1 obsolete name)
Ophthalmophyllum (1 taxon, 2 obsolete names)
Opulaster (1 obsolete name)
Opuntia (214 taxa, 586 obsolete names)
Orbea (1 taxon)
Orbeopsis (1 taxon)
Oreobatus (1 obsolete name)
Oreobroma (1 obsolete name)
Oreocereus (11 taxa, 13 obsolete names)
Origanum (6 taxa)
Ornithogalum (4 taxa, 2 obsolete names)
Orontium (1 taxon)
Oroya (2 taxa, 8 obsolete names)
Ortegocactus (1 taxon)
Ortgiesia (1 obsolete name)
Orthocarpus (4 obsolete names)
Orthophytum (1 taxon)
Orthopterum (1 taxon, 1 obsolete name)
Oscularia (1 taxon)
Osmanthus (4 taxa, 3 obsolete names)
Osmunda (3 taxa, 2 obsolete names)
Osteospermum (6 taxa)
Ostrya (2 taxa)
Otacanthus (1 taxon)
Otatea (1 taxon)
Othonna (2 taxa)
Oxalis (10 taxa, 3 obsolete names)
Oxera (1 taxon)
Oxybaphus (1 obsolete name)
Oxycoccus (1 obsolete name)
Oxydendrum (1 taxon)
Oxypetalum (1 obsolete name)
Oxystelma (1 obsolete name)
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