Marrubium vulgare
White Horehound
Matricaria chamomilla
Scented Mayweed
Matricaria discoidea
Pineappleweed
Matthiola sinuata
Sea Stock
Medicago arabica
Spotted Medick
Medicago littoralis
Shore Medick
Medicago lupulina
Black Medick
Medicago polymorpha
Toothed Medick
Medicago sativa
Lucerne
Melampyrum pratense
Common Cow-wheat
Melampyrum sylvaticum
Small Cow-wheat
Melica uniflora
Wood Melick
Melilotus altissimus
Tall Melilot
Melilotus indicus
Small Melilot
Melilotus officinalis
Ribbed Melilot
Mentha aquatica
Water Mint
Mentha arvensis
Corn Mint
Mentha pulegium
Pennyroyal
Mentha x villosa
Apple-mint
Menyanthes trifoliata
Bogbean
Mercurialis annua
Annual Mercury
Mercurialis perennis
Dog's Mercury
Meum athamanticum
Spignel
Micranthes stellaris
Starry Saxifrage
Moehringia trinervia
Three-nerved Sandwort
Moenchia erecta
Upright Chickweed
Molinia caerulea
Purple Moor-grass
Montia fontana
Blinks
Morus nigra
Black Mulberry
Myosotis arvensis
Field 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 sylvatica
Wood Forget-me-not
Myrica gale
Bog-myrtle
Myriophyllum alterniflorum
Alternate Water-milfoil
Myriophyllum spicatum
Spiked Water-milfoil
Myrrhis odorata
Sweet Cicely
Nardus stricta
Mat-grass
Neottia cordata
Lesser Twayblade
Neottia nidus-avis
Bird's-nest Orchid
Neottia ovata
Common Twayblade
Nepeta x faassenii
Garden Cat-mint
Nymphoides peltata
Fringed Water-lily
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
Oenanthe silaifolia
Narrow-leaved Water-dropwort
Oenothera biennis
Small-flowered Evening-primrose
Onobrychis viciifolia
Sainfoin
Ononis reclinata
Small Restharrow
Ononis repens
Common Restharrow
Ononis spinosa
Spiny Restharrow
Ophrys apifera
Bee Orchid
Origanum vulgare
Wild Marjoram
Ornithogalum pyrenaicum
Spiked Star-of-Bethlehem
Ornithogalum umbellatum
Star-of-Bethlehem
Orobanche caryophyllacea
Bedstraw Broomrape
Orobanche hederae
Ivy Broomrape
Orobanche minor
Common Broomrape
Orobanche rapum-genistae
Greater Broomrape
Orthilia secunda
Serrated Wintergreen
Oxybasis glauca
Oak-leaved Goosefoot
Papaver lecoqii
Yellow-juiced Poppy
Parentucellia viscosa
Yellow Bartsia
Parietaria judaica
Pellitory-of-the-wall
Paris quadrifolia
Herb-paris