Mercurialis perennis
Dog's Mercury
Meum athamanticum
Spignel
Miscanthus sinensis
Chinese Silver Grass
Mitracarpus hirtus
Tropical Girdlepod
Moehringia trinervia
Three-nerved Sandwort
Molinia caerulea
Purple Moor-grass
Montia fontana
Blinks
Mussaenda erythrophylla
Ashanti Blood
Mussaenda philippica
Agboy
Myosotis alpestris
Alpine Forget-me-not
Myosotis discolor
Changing Forget-me-not
Myosotis laxa
Tufted Forget-me-not
Myosotis ramosissima
Early Forget-me-not
Myosotis scorpioides
Water Forget-me-not
Myosotis stricta
Myriophyllum alterniflorum
Alternate Water-milfoil
Myriophyllum aquaticum
Parrot's-feather
Myriophyllum spicatum
Spiked Water-milfoil
Myrrhis odorata
Sweet Cicely
Narcissus nobilis
Large-flowered Daffodil
Narcissus pseudonarcissus
Nardus stricta
Mat-grass
Narthecium ossifragum
Bog Asphodel
Neottia cordata
Lesser Twayblade
Neottia nidus-avis
Bird's-nest Orchid
Nepenthes spp.
Pitcherplant
Neustanthus phaseoloides
Tropical Kudzu
Nicandra physalodes
Apple-of-Peru
Nonea lutea
Yellow Nonea
Nuphar lutea
Yellow Water-lily
Ocinum americanum
American Basil
Odontites vernus
Red Bartsia
Oenanthe crocata
Hemlock Water-dropwort
Oenanthe fistulosa
Tubular Water-dropwort
Oenanthe lachenalii
Parsley Water-dropwort
Oenanthe silaifolia
Narrow-leaved Water-dropwort
Oenothera biennis
Common Evening-primrose
Olearia macrodonta
New Zealand Holly
Ononis reclinata
Small Restharrow
Ononis repens
Common Restharrow
Ophioglossum azoricum
Small Adder's-tongue
Ophioglossum vulgatum
Adder's-tongue
Ophiopogon jaburan
Giant Lilyturf
Ophrys apifera
Bee Orchid
Ophrys fuciflora
Late Spider-orchid
Ophrys insectifera
Fly Orchid
Orchid 'Butterfly Wings'
Orchis mascula
Early-purple Orchid
Ornithogalum nutans
Drooping Star-of-Bethlehem
Ornithogalum pyrenaicum
Spiked Star-of-Bethlehem
Ornithopus perpusillus
Bird's-foot
Orobanche caryophyllacea
Bedstraw Broomrape
Orobanche hederae
Ivy Broomrape
Orobanche minor
Common Broomrape
Orobanche picridis
Oxtongue Broomrape
Orobanche rapum-genistae
Greater Broomrape
Orthilia secunda
Serrated Wintergreen
Osmoxylon lineare
Green Aralia
Osmunda regalis
Royal Fern
Oxalis acetosella
Wood-sorrel
Oxybasis glauca
Oak-leaved Goosefoot
Oxybasis rubra
Red Goosefoot
Palhinhaea cernua
Staghorn Clubmoss
Panicum trichanthum
Thicket Panic Grass
Papaver cambricum
Welsh Poppy
Paphiopedilum callosum
Callus Paphiopedilum
Paphiopedilum hirsutissimum
Paphiopedilum spp.
Ladyslipper
Parietaria judaica
Pellitory-of-the-wall
Paris quadrifolia
Herb-paris