Anthriscus caucalis
Bur Chervil
Anthriscus sylvestris
Cow Parsley
Anthyllis vulneraria
Kidney Vetch
Antirrhinum majus
Snapdragon
Aphanes arvensis
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
Araucaria araucana
Monkey-puzzle
Arbutus unedo
Strawberry-tree
Arctium lappa
Greater Burdock
Arctium minus
Lesser Burdock
Arenaria serpyllifolia
Thyme-leaved Sandwort
Armeria maritima
Thrift
Asparagus officinalis
Garden Asparagus
Asperula cynanchica
Squinancywort
Asplenium adiantum-nigrum
Black Spleenwort
Asplenium ceterach
Rustyback
Asplenium marinum
Sea Spleenwort
Asplenium nidus
Bird's Nest Fern
Asplenium onopteris
Irish Spleenwort