Arabis hirsuta
Hairy Rock-cress
Arabis scabra
Bristol Rock-cress
Araucaria araucana
Monkey-puzzle
Arbutus sp.
Arbutus unedo
Strawberry-tree
Arctium lappa
Greater Burdock
Arctium minus
Lesser Burdock
Arctium nemorosum
Wood Burdock
Arenaria serpyllifolia
Thyme-leaved Sandwort
Aristolochia clematitis
Birthwort
Armeria maritima
Thrift
Armoracia rusticana
Horse-radish
Artemisia vulgaris
Mugwort
Artocarpus odoratissimus
Merang
Arum italicum
Italian Lords-and-Ladies
Arum maculatum
Lords-and-Ladies
Aruncus dioicus
Buck's-beard
Asparagus officinalis
Garden Asparagus
Asparagus verticillatus
Climbing Asparagus
Asperula cynanchica
Squinancywort
Asplenium adiantum-nigrum
Black Spleenwort
Asplenium ceterach
Rustyback
Asplenium marinum
Sea Spleenwort
Asplenium nidus
Bird's Nest Fern