• Acer campestre Field Maple
  
• Acer pseudoplatanus Sycamore
  
• Achillea millefolium Yarrow
  
• Achillea ptarmica Sneezewort
  
• Aegopodium podagraria Ground Elder
  
• Aethusa cynapium Fool's Parsley
  
• Agrimonia eupatoria Agrimony
  
• Agrimonia procera Fragrant Agrimony
  
• Ajuga pyramidalis Pyramid Bugle
  
• Ajuga reptans Bugle
  
• Alchemilla filicaulis Lady's Mantle
  
• Alchemilla glabra Lady's Mantle
  
• Alchemilla xanthochlora Lady's Mantle
  
• Alisma plantago-aquatica Water-plantains
  
• Alliaria petiolata Garlic Mustard
  
• Allium ampeloprasum Wild leek
  
• Allium ursinum Wild Garlic
  
• Alnus glutinosa Alder
  
• Althaea officinalis Marsh-mallow
  
• Anacamptis pyramidalis Pyramidal Orchid
  
• Anagallis arvensis Scarlet Pimpernel
  
• Anagallis minima Chaffweed
  
• Anagallis tenella Bog Pimpernel
  
• Anemone nemorosa Wood Anenome
  
• Angelica sylvestris Wild Angelina
  
• Antennaria dioica Mountain Cudweed
  
• Anthriscus sylvestris Cow Parsley
  
• Anthyllis vulneraria Kidney Vetch
  
• Aphanes arvensis Parsley-piert
  
• Aphanes australis Slender Parsley-piert
  
• Apium graveolens Celery, Wild
  
• Apium inundatum Lesser Marshwort
  
• Apium nodiflorum Fool's Water-cress
  
• Aquilegia vulgaris Columbine
  
• Arabidopsis thaliana Thale Cress
  
• Arabis hirsuta Hairy Rock-cress
  
• Arctium nemorosum Burdock
  
• Arctostaphylos uva-ursi Bearberry
  
• Arenaria norvegica Arctic Sandwort
  
• Arenaria serpyllifolia Thyme-leaved Sandwort
  
• Armeria maritima Sea-pink
  
• Armoracia rusticana Horse-radish
  
• Artemisia vulgaris Mugwort
  
• Arum maculatum Lords and Ladies
  
• Asperula cynanchica Squinancywort
  
• Aster tripolium Sea Aster
  
• Astragalus danicus Purple Milk-vetch
  
• Atriplex glabriuscula Babington's Orache
  
• Atriplex laciniata Frosted Orache
  
• Atriplex littoralis Grass-leaved Orache