Anthemis cotula
Stinking Chamomile
Anthoxanthum odoratum
Sweet Vernal-grass
Anthriscus caucalis
Bur Chervil
Anthriscus sylvestris
Cow Parsley
Anthyllis vulneraria
Kidney Vetch
Antirrhinum majus
Snapdragon
Aphanes arvensis
Parsley-piert
Aphanes arvensis agg.
Parsley-piert
Aphanes australis
Slender Parsley-piert
Aquilegia vulgaris
Columbine
Arabidopsis petraea
Northern Rock-cress
Arabidopsis thaliana
Thale Cress
Arabis caucasica
Garden Arabis
Arabis hirsuta
Hairy Rock-cress
Arabis scabra
Bristol Rock-cress
Araucaria araucana
Monkey-puzzle
Arbutus unedo
Strawberry-tree
Arctium lappa
Greater Burdock
Arctium minus
Lesser Burdock
Arctium minus sens. str.
Lesser Burdock
Arctium nemorosum
Wood Burdock
Arenaria serpyllifolia
Thyme-leaved Sandwort
Aristolochia clematitis
Birthwort
Armeria maritima
Thrift
Armillaria mellea
Honey Fungus
Armoracia rusticana
Horse-radish
Arrhenatherum elatius
False Oat-grass
Artemisia vulgaris
Mugwort
Arum italicum
Italian Lords-and-Ladies
Arum maculatum
Lords-and-Ladies
Aruncus dioicus
Buck's-beard
Asparagus officinalis
Garden Asparagus
Asperula cynanchica
Squinancywort
Asplenium adiantum-nigrum
Black Spleenwort
Asplenium ceterach
Rustyback
Asplenium marinum
Sea Spleenwort
Asplenium onopteris
Irish Spleenwort
Asplenium ruta-muraria
Wall-rue
Asplenium scolopendrium
Hart's-tongue
Asplenium septentrionale
Forked Spleenwort
Asplenium trichomanes
Maidenhair Spleenwort
Asplenium viride
Green Spleenwort
Astragalus glycyphyllos
Wild Liquorice
Athyrium filix-femina
Lady-fern
Atriplex glabriuscula
Babington's Orache
Atriplex halimus
Shrubby Orache
Atriplex laciniata
Frosted Orache
Atriplex littoralis
Grass-leaved Orache
Atriplex portulacoides
Sea-purslane
Atriplex prostrata
Spear-leaved Orache
Aubrieta deltoidea
Aubretia
Auricularia auricula-judae
Jelly Ear
Avena sativa
Oat
Baldellia ranunculoides
Lesser Water-plantain
Ballota nigra
Black Horehound
Barbarea verna
American Winter-cress
Barbarea vulgaris
Winter-cress
Bartramia stricta
Bartramia stricta and Riccia subbifurca
Bellis perennis
Daisy
Berberis vulgaris
Barberry
Berula erecta
Lesser Water-parsnip
Beta vulgaris
Sea Beet
Betonica officinalis
Betony
Betula pendula
Silver Birch
Betula pubescens
Downy Birch
Bidens cernua
Nodding Bur-marigold
Bidens tripartita
Trifid Bur-marigold
Bistorta officinalis
Common Bistort
Bistorta vivipara
Alpine Bistort