Arabis hirsuta
Hairy Rock-cress
Arabis scabra
Bristol Rock-cress
Arbutus menziesii
Pacific Madrone
Arbutus unedo
Strawberry-tree
Arenaria serpyllifolia
Thyme-leaved Sandwort
Armeria maritima
Thrift
Armoracia rusticana
Horse-radish
Artemisia vulgaris
Mugwort
Arum italicum
Italian Lords-and-Ladies
Aruncus dioicus
Buck's-beard
Asperula cynanchica
Squinancywort
Asplenium adiantum-nigrum
Black Spleenwort
Asplenium marinum
Sea Spleenwort
Asplenium ruta-muraria
Wall-rue
Asplenium scolopendrium
Hart's-tongue
Asplenium trichomanes
Maidenhair Spleenwort
Asplenium viride
Green Spleenwort
Astrantia major
Astrantia
Athyrium filix-femina
Lady-fern
Atriplex glabriuscula
Babington's Orache
Atriplex laciniata
Frosted Orache
Atriplex littoralis
Grass-leaved Orache
Atriplex portulacoides
Sea-purslane
Atriplex prostrata
Spear-leaved Orache