Arabis scabra
Bristol Rock-cress
Arachnothryx leucophylla
Bush Pentas
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
Ardisia crenata
Christmas Berry
Arenaria montana
Mountain Sandwort
Arenaria serpyllifolia
Thyme-leaved Sandwort
Argemone subfusiformis
Prickly Poppy
Aristolochia clematitis
Birthwort
Armeria maritima
Thrift
Armoracia rusticana
Horse-radish
Arrhenatherum elatius
False Oat-grass
Artemisia vulgaris
Mugwort
Arthropodium candidum
Forest#Floor Lily
Arum maculatum
Lords-and-Ladies
Aruncus dioicus
Buck's-beard
Asarina procumbens
Trailing Snapdragon
Asparagus verticillatus
Climbing Asparagus