Abelia

Abeliophyllum

Abies

Acaena

Acanthus

Acca

Acer

Achillea

Aconitum

Aconogonon

Acorus

Actaea

Actinidia

Aesculus

Afrocarpus

Agapanthus

Agarista

Agastache

Ajuga

Akebia

Alangium

Albizia

Alcea

Alchemilla

Alchornea

Allium

Alnus

Aloysia

Alstroemeria

Althaea

Alyssoides

Amarine

Amelanchier

Amorpha

Ampelopsis

Amsonia

Anagallis

Anaphalis

Anchusa

Andromeda

Andropogon

Anemanthele

Anemone

Anethum

Angelica

Antennaria

Anthemis

Anthericum

Anthriscus

Anthyllis

Apios

Apium

Aquilegia

Arabis

Arachnoides

Aralia

Araucaria

Arbutus

Arctostaphylos

Aristolochia

Armeria

Armoracia

Arnica

Aronia

Arrhenatherum

Artemisia

Arthropodium

Arum

Aruncus

Arundo

Asarum

Asimina

Asparagus

Asphodeline

Asplenium

Astelia

Aster

Astilbe

Astilboides

Astrantia

Atherosperma

Athyrium

Atriplex

Aubrieta

Aucuba

Aurinia

Azara

Azorella