Alopecurus geniculatus
Marsh Foxtail
Alstonia pneumatophora
Marsh Pulai
Alstroemeria ligtu
Peruvian lily
Alternanthera bettzickiana
Calico-plant
Alternanthera brasiliana
Ruby Leaf
Althaea officinalis
Marsh-mallow
Alysicarpus ovalifolius
Alyce Clover
Amaranthus hybridus
Green Amaranth
Amaranthus retroflexus
Common Amaranth
Ambrosia artemisiifolia
Ragweed
Amelanchier lamarckii
Juneberry
Ammi majus
Bullwort
Ammophila arenaria
Marram
Amsinckia micrantha
Common Fiddleneck
Anacamptis morio
Green-winged Orchid
Anacamptis pyramidalis
Pyramidal Orchid
Anamirta cocculus
Indian Berry
Anaphalis margaritacea
Pearly Everlasting
Andrographis paniculata
Creat
Andromeda polifolia
Bog-rosemary
Androsace villosa
Hairy Androsace
Anemone nemorosa
Wood Anemone
Angelica archangelica
Garden Angelica
Angelica sylvestris
Wild Angelica
Annona squamosa
Sugar Apples
Anomodon viticulosus
Rambling Tail-moss
Antennaria dioica
Mountain Everlasting
Anthemis cotula
Stinking Chamomile
Anthriscus caucalis
Bur Chervil
Anthriscus sylvestris
Cow Parsley
Anthurium andraeanum
Laceleaf
Anthurium hookerii
Anthurium scherzerianum
Flamingo Flower
Anthurium schlechtendalii
Pheasant's Tail
Anthyllis vulneraria
Kidney Vetch
Antirrhinum majus
Snapdragon
Aphanes arvensis
Parsley-piert
Aphanes australis
Slender Parsley-piert
Aquilegia pyrenaica
Pyrenean Columbine
Aquilegia vulgaris
Columbine
Arabidopsis petraea
Northern Rock-cress
Arabidopsis thaliana
Thale Cress
Arabis caucasica
Garden Arabis
Arabis hirsuta
Hairy Rock-cress
Arabis scabra
Bristol Rock-cress
Araucaria araucana
Monkey-puzzle
Araucaria heterophylla
Norfolk Island Pine
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
Asplenium onopteris
Irish Spleenwort
Asplenium ruta-muraria
Wall-rue