Arabis hirsuta
Hairy Rock-cress
Arabis scabra
Bristol Rock-cress
Arbutus menziesii
Pacific Madrone
Arbutus sp.
Arbutus unedo
Strawberry-tree
Arctium lappa
Greater Burdock
Arctium minus
Lesser Burdock
Arctium minus sens. str.
Lesser Burdock
Arctium nemorosum
Wood Burdock
Arctium tomentosum
Woolly Burdock
Arenaria montana
Mountain Sandwort
Arenaria serpyllifolia
Thyme-leaved Sandwort
Argemone subfusiformis
Prickly Poppy
Armeria maritima
Thrift
Armoracia rusticana
Horse-radish
Artemisia vulgaris
Mugwort
Aruncus dioicus
Buck's-beard
Asarina procumbens
Trailing Snapdragon
Asperula cynanchica
Squinancywort
Astragalus glycyphyllos
Wild Liquorice
Astrantia major
Astrantia
Atriplex glabriuscula
Babington's Orache
Atriplex halimus
Shrubby Orache
Atriplex laciniata
Frosted Orache