Myosotis discolor
Changing Forget-me-not
Myosotis scorpioides
Water Forget-me-not
Myosotis secunda
Creeping Forget-me-not
Myosotis sylvatica
Wood Forget-me-not
Myrica gale
Bog-myrtle
Myriophyllum alterniflorum
Alternate Water-milfoil
Myriophyllum aquaticum
Parrot's-feather
Myriophyllum spicatum
Spiked Water-milfoil
Myrrhis odorata
Sweet Cicely
Narcissus macrolobus
Pale-flowered Daffodil
Narcissus obvallaris
Tenby Daffodil
Nasturtium officinale
Water-cress
Neottia cordata
Lesser Twayblade
Neottia nidus-avis
Bird's-nest Orchid
Neottia ovata
Common Twayblade
Nepenthes truncata
Nerium oleander
Oleander
Nicandra physalodes
Apple-of-Peru
Nonea lutea
Yellow Nonea
Nothofagus alpina
Rauli
Nuphar lutea
Yellow Water-lily
Nymphaea lotus
Egyptian lotus
Nymphoides peltata
Fringed Water-lily
Nypta fruticans
Nipa Palm
Ochna serrulata
Small-leaved Plane
Ocimum americanum
American Basil
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
Olearia macrodonta
New Zealand Holly
Onobrychis viciifolia
Sainfoin
Ononis reclinata
Small Restharrow
Ononis repens
Common Restharrow
Ononis spinosa
Spiny Restharrow
Ophioglossum azoricum
Small Adder's-tongue
Ophioglossum vulgatum
Adder's-tongue
Oplismenus compositus
Running Mountaingrass
Orchis mascula
Early-purple Orchid
Orchis militaris
Military Orchid
Orchis x angusticruris
Lady#Orchid#/ Monkey#Orchid#hybrid
Oreopteris limbosperma
Lemon-scented Fern
Ornithogalum pyrenaicum
Spiked Star-of-Bethlehem
Ornithopus perpusillus
Bird's-foot
Orthilia secunda
Serrated Wintergreen
Osmoxylon lineare
Green Aralia
Osmunda regalis
Royal Fern
Oxalis acetosella
Wood-sorrel
Oxalis corniculata
Creeping Woodsorrel
Oxalis triangularis
False Shamrock
Oxybasis glauca
Oak-leaved Goosefoot
Oxybasis rubra
Red Goosefoot
Pandanus tectorius
Thatch Screwpine
Panicum trichanthum
Thicket Panic Grass
Papaver cambricum
Welsh Poppy
Parentucellia viscosa
Yellow Bartsia
Parietaria judaica
Pellitory-of-the-wall
Paris quadrifolia
Herb-paris
Parnassia palustris
Grass-of-Parnassus
Paulownia tomentosa
Foxglove-tree
Pedicularis palustris
Marsh Lousewort
Pelargonium zonale
Zonal Geranium
Pentaglottis sempervirens
Green Alkanet
Peperomia pellucida
Pepper Elder
Peperomia polybotrya
Raindrop Peperomia
Pereskia aculeata
Barbados Gooseberry
Persicaria amphibia
Amphibious Bistort