Nonea lutea
Yellow Nonea
Nothofagus alpina
Rauli
Nuphar lutea
Yellow Water-lily
Nymphaea alba
White Water-lily
Nymphaea x marliacea
Coloured Water-lily
Nymphoides peltata
Fringed Water-lily
Ochrolechia parella
Crab-eye Lichen
Ochrolechia tartarea
Odontites vernus
Red Bartsia
Oenanthe aquatica
Fine-leaved Water-dropwort
Oenanthe crocata
Hemlock Water-dropwort
Oenanthe fistulosa
Tubular Water-dropwort
Oenanthe lachenalii
Parsley Water-dropwort
Oenanthe pimpinelloides
Corky-fruited Water-dropwort
Oenanthe silaifolia
Narrow-leaved Water-dropwort
Oenothera biennis
Small-flowered Evening-primrose
Oenothera stricta
Fragrant Evening-primrose
Olearia macrodonta
New Zealand Holly
Omphalina ericetorum
Onobrychis viciifolia
Sainfoin
Ononis repens
Common Restharrow
Ononis spinosa
Spiny Restharrow
Ophioglossum vulgatum
Adder's-tongue
Ophioparma ventosa
Blood-spot Lichen