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        Oenothera acaulis
        Oenothera caespitosa
        Oenothera kunthiana
        Oenothera missouriensis
        Olsynium douglasii
        Omphalodes lojkae
        Omphalodes luciliae
        Omphalodes verna
        Onosma alboroseum
        Onosma nanum
        Onosma polyphylla
        Onosma rigida
        Ophrys apifera
        Ornithogalum montanum
        Ornithogalum sibthorpii

        Orostachys iwarenge      
        Orostachys malacophyllus  
          Oxalis adenophylla
          Oxalis depressa (syn. O. inops) 
          Oxalis enneaphylla  
          Oxalis enneaphylla ssp. ibarii
        Oxalis ´Ione Hecker
          Oxalis laciniata
          Oxalis ´Ute´