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Abelia	Abeliophyllum (white forsythia)	Abelmoschus (okra)
Abies (fir)	Abromeitiella (obsolete)	Abronia (sand verbena)
Abutilon	Acacia (wattle)	Acaena
Acalypha	Acantholimon	Acanthophoenix
Acanthus	Acca	Acer (maple)
Achillea (yarrow)	Achimenantha (hybrid genus)	Achimenes
Acinos (calamint)	Aciphylla	Acmena
Acoelorraphe (saw palm)	Acokanthera	Aconitum (aconite, monkshood)
Acorus	Acrocomia	Actaea (baneberry)
Actinidia (kiwifruit)	Ada	Adansonia
Adenia	Adenium	Adenocarpus
Adenophora	Adenostoma	Adiantum (maidenhair fern)
Adlumia	Adonis	Adromischus
Aechmea	Aegopodium	Aeonium
Aerangis (an orchid genus)	Aerides (an orchid genus)	Aeschynanthus
Aesculus (buckeye, horse-chestnut)	Aethionema	Agapanthus
Agapetes	Agastache	Agathis
Agave	Ageratum	Aglaonema
Agonis	Agrostemma (corn cockle)	Agrostis
Aichryson	Ailanthu	Aiphanes
Aira (hair grass)	Ajania	Ajuga (bugleweed)
Akebia	Alangium	Albizia (silk tree)
Albuca	Alcea (hollyhock)	Alchemilla
Aleurites	Aliceara (hybrid genus)	Alisma (water plantain)
Alkanna	Allamanda	Allium (onion)
Alluaudia	Alnus (alder)	Alocasia
Aloe	Aloinopsis	Alopecurus (foxtail grass)
Aloysia	Alpinia (ginger lily)	Alsobia
Alstroemeria	Alternanthera	Althaea
Alyogyne	Alyssum	Amaranthus
Amarcrinum (hybrid genus)	Amarygia (hybrid genus)	Amaryllis
Amberboa	Amelanchier	Amesiella
Amherstia	Amicia	Ammi
Ammobium	Amorpha	Amorphophallus
Ampelopsis	Amsonia	Anacampseros
Anacyclus	Anagallis (pimpernel)	Ananas (pineapple)
Anaphalis	Anchusa	Andromeda
Andropogon	Androsace	Anemone (windflower)
Anemonella	Anemonopsis	Anemopaegma
Anethum (dill)	Angelica	Angelonia

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