Abies procera
Noble Fir
Achillea millefolium
Yarrow
Achillea ptarmica
Sneezewort
Acis autumnalis
Aconitum napellus
Monk's-hood
Adiantum capillus-veneris
Maidenhair Fern
Adonis annua
Pheasant's-eye
Adoxa moschatellina
Moschatel
Aegonychon purpureocaeruleum
Purple Gromwell
Aegopodium podagraria
Ground-elder
Agave sisalana
Sisal
Ageratum conyzoides
Billygoat-weed
Agrimonia procera
Fragrant Agrimony
Agrostemma githago
Corncockle
Alchemilla glabra
Smooth Lady's-mantle
Alisma plantago-aquatica
Water-plantain
Alliaria petiolata
Garlic Mustard
Allium schoenoprasum
Chives
Allium triquetrum
Three-cornered Garlic
Allium tuberosum
Chinese Chives
Alnus glutinosa
Alder
Alopecurus pratensis
Meadow Foxtail
Amaranthus retroflexus
Common Amaranth
Amsinckia micrantha
Common Fiddleneck
Anacamptis pyramidalis
Pyramidal Orchid
Angelica archangelica
Garden Angelica
Angelica sylvestris
Wild Angelica
Antennaria dioica
Mountain Everlasting
Anthoxanthum odoratum
Sweet Vernal-grass
Anthriscus sylvestris
Cow Parsley
Aphanes arvensis
Parsley-piert
Arabidopsis petraea
Northern Rock-cress
Arabidopsis thaliana
Thale Cress
Arabis hirsuta
Hairy Rock-cress
Arabis scabra
Bristol Rock-cress
Araucaria heterophylla
Norfolk Island Pine
Arctium minus
Lesser Burdock
Arenaria serpyllifolia
Armoracia rusticana
Horse-radish
Arrhenatherum elatius
False Oat-grass
Asparagus verticillatus
Asplenium onopteris
Irish Spleenwort
Atriplex laciniata
Frosted Orache
Atriplex littoralis
Grass-leaved Orache
Atriplex portulacoides
Sea-purslane
Atriplex prostrata
Spear-leaved Orache
Avena sativa
Oat
Baldellia ranunculoides
Lesser Water-plantain
Ballota nigra
Black Horehound
Barbarea vulgaris
Winter-cress
Berberis vulgaris
Barberry
Berula erecta
Lesser Water-parsnip
Beta vulgaris
Sea Beet
Betonica officinalis
Betony
Betula pubescens
Downy Birch
Bidens cernua
Nodding Bur-marigold
Bistorta vivipara
Alpine Bistort
Blitum bonus-henricus
Good-King-Henry
Borago officinalis
Borage
Borago pygmaea
Slender Borage
Bougainvillea glabra
Lesser Bougainvillea
Brassica rapa
Turnip
Briza media
Quaking-grass
Bryonia dioica
White Bryony
Butomus umbellatus
Flowering-rush
Buxus sempervirens
Box
Caltha palustris
Marsh-marigold
Calystegia pulchra
Hairy Bindweed
Campanula glomerata
Clustered Bellflower
Campanula patula
Spreading Bellflower