Alchemilla xanthochlora
Intermediate Lady's-mantle
Alisma lanceolatum
Narrow-leaved Water-plantain
Alisma plantago-aquatica
Water-plantain
Allamanda cathartica
Golden Trumpet
Alliaria petiolata
Garlic Mustard
Allium ampeloprasum
Allium schoenoprasum
Chives
Allium triquetrum
Three-cornered Garlic
Allium ursinum
Ramsons
Alnus glutinosa
Alder
Alocasia sanderiana
Kris plant
Alopecurus aequalis
Orange Foxtail
Alopecurus geniculatus
Marsh Foxtail
Alstonia pneumatophora
Marsh Pulai
Alternanthera brasiliana
Ruby Leaf
Althaea officinalis
Marsh-mallow
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