Abelmoschus esculentus
Okra
Abutilon
Abutilon megapotamicum
Trailing Abutilon
Abutilon vitifolium
Vine-leaved Abutilon
Acaena ovalifolia
Two-spined Acaena
Acalypha hispida
Chenille Plant
Acanthus mollis
Bear's-breech
Acer campestre
Field Maple
Acer platanoides
Norway Maple
Acer pseudoplatanus
Sycamore
Achillea millefolium
Yarrow
Achillea ptarmica
Sneezewort
Achillea x lewisii
Achillea
Acis autumnalis
Acmella caulirhiza
Aaku Mella
Aconitum napellus
Monk's-hood
Adenium obesum
Desert Rose
Adonis annua
Pheasant's-eye
Adoxa moschatellina
Moschatel
Aegonychon purpureocaeruleum
Purple Gromwell
Aegopodium podagraria
Ground-elder
Aeschynomene americana
Shyleaf
Aesculus hippocastanum
Horse-chestnut
Aethusa cynapium
Fool's Parsley
Agapanthus sp.
African lily
Agave parviflora
Ageratum conyzoides
Billygoat-weed
Agrimonia eupatoria
Agrimony
Agrimonia procera
Fragrant Agrimony
Agrostemma githago
Corncockle
Agrostis capillaris
Common Bent
Ajuga reptans
Bugle
Alcea rosea
Hollyhock
Alchemilla alpina
Alpine Lady's-mantle
Alchemilla filicaulis
Hairy Lady's-mantle
Alchemilla glabra
Smooth Lady's-mantle
Alchemilla mollis
Garden Lady's-mantle
Alchemilla sp.
Lady's Mantle (cultivated)
Alchemilla xanthochlora
Intermediate Lady's-mantle
Alisma lanceolatum
Narrow-leaved Water-plantain
Alisma plantago-aquatica
Water-plantain
Allamanda blanchetii
Purple Allamanda
Allamanda cathartica
Golden Trumpet
Allamanda schottii
Bush llamanda
Alliaria petiolata
Garlic Mustard
Allium ampeloprasum
Wild Leek
Allium cepa
Onion
Allium oleraceum
Field Garlic
Allium roseum
Rosy Garlic
Allium schoenoprasum
Chives
Allium siculum
Honey Garlic
Allium trifoliatum
Hirsute Garlic
Allium triquetrum
Three-cornered Garlic
Allium tuberosum
Chinese Chives
Allium ursinum
Ramsons
Allium vineale
Wild Onion
Alnus glutinosa
Alder
Alpinia purpurata
Red Ginger
Alstroemeria brasiliensis
Alstroemeria
Alstroemeria ligtu
Peruvian lily
Alternanthera ficoidea
Joseph's Coat
Althaea officinalis
Marsh-mallow
Alyogyne huegelii
Blue Hibiscus
Alysicarpus vaginalis
Alyce Clover
Amaranthus hybridus
Green Amaranth
Amaranthus retroflexus
Common Amaranth
Amaryllis belladonna
Jersey Lily
Ambrosia artemisiifolia
Ragweed
Amelanchier lamarckii
Juneberry
Ammi majus
Bullwort