• Littorella uniflora Shoreweed
  
• Lobelia dortmanna Water Lobelia
  
• Lonicera periclymenum Woodbine
  
• Lotus corniculatus Bird's-foot-trefoil
  
• Lotus pedunculatus Greater Bird's-foot-trefoil
  
• Luzula campestris Field Wood-rush
  
• Luzula multiflora Wood-rush, Heath
  
• Luzula sylvatica Great Wood-rush
  
• Lychnis flos-cuculi Ragged Robin
  
• Lycopus europaeus Gypsywort
  
• Lysimachia nemorum Yellow Pimpernel
  
• Lysimachia vulgaris Yellow Loosestrife
  
• Lythrum portula Water-purslane
  
• Lythrum salicaria Purple-loosestrife
  
• Malus domestica Apple
  
• Malus sylvestris Crab Apple
  
• Malva sylvestris Common Mallow
  
• Matricaria discoidea Pineappleweed
  
• Meconopsis cambrica Poppy, Welsh
  
• Medicago lupulina Black Medick
  
• Medicago sativa Lucerne
  
• Melampyrum pratense Common Cow-wheat
  
• Mentha aquatica Mint, Water
  
• Mentha arvensis Corn mint
  
• Mentha spicata Spear Mint
  
• Mentha suaveolens Mint, Round-leaved
  
• Menyanthes trifoliata Bogbean
  
• Mercurialis perennis Dog's Mercury
  
• Mimulus guttatus Monkey-flower
  
• Minuartia verna Spring Sandwort
  
• Moehringia trinervia Sandwort, Three-nerved
  
• Monotropa hypopitys Yellow Bird's-nest
  
• Montia fontana Blinks
  
• Mycelis muralis Wall Lettuce
  
• Myosotis arvensis Forget-me-not, Field
  
• Myosotis discolor Changing Forget-me-not
  
• Myosotis laxa Tufted Forget-me-not
  
• Myosotis scorpioides Forget-me-not, Water
  
• Myosotis secunda Forget-me-not, Creeping
  
• Myrica gale Bog-myrtle
  
• Myriophyllum alterniflorum Water-milfoil, Alternate
  
• Myriophyllum spicatum Spiked Water-milfoil
  
• Myriophyllum verticillatum Whorled Water-milfoil
  
• Najas flexilis Slender Naiad
  
• Narcissus medioluteus Primrose-peerless
  
• Narthecium ossifragum Bog Asphodel
  
• Neotinea maculata Dense-flowered orchid
  
• Neottia nidus-avis Bird's-nest orchid
  
• Nuphar lutea Yellow Water-lily
  
• Nymphaea alba White Water-lily