Nicandra physalodes
Apple-of-Peru
Noccaea caerulescens
Alpine Penny-cress
Nuphar lutea
Yellow Water-lily
Nymphoides peltata
Fringed Water-lily
Ochrolechia parella
Crab-eye Lichen
Odontites vernus
Red Bartsia
Oenanthe crocata
Hemlock Water-dropwort
Oenanthe fistulosa
Tubular Water-dropwort
Oenanthe lachenalii
Parsley Water-dropwort
Oenanthe pimpinelloides
Corky-fruited Water-dropwort
Oenothera glazioviana
Large-flowered Evening-primrose
Olearia macrodonta
New Zealand Holly
Onobrychis viciifolia
Sainfoin
Ononis reclinata
Small Restharrow
Ononis repens
Common Restharrow
Ophioglossum azoricum
Small Adder's-tongue
Ophioglossum vulgatum
Adder's-tongue
Ophioparma ventosa
Blood-spot Lichen
Ophrys apifera
Bee Orchid
Ophrys insectifera
Fly Orchid
Ophrys sphegodes
Early Spider-orchid
Orchis mascula
Early-purple Orchid
Orchis militaris
Military Orchid
Orchis simia
Monkey Orchid