Abelia

Abeliophyllum

Abies

Acaena

Acanthus

Acca

Acer

Achillea

Achnatherum

Aconitum

Aconogonon

Acorus

Actaea

Actinidia

Adina

Aesculus

Afrocarpus

Agapanthus

Agapetes

Agarista

Agastache

Agrimonia

Ajuga

Akebia

Alangium

Albizia

Albuca

Alcea

Alchemilla

Alchornea

Allium

Alnus

Aloysia

Althaea

Amarine

Amelanchier

Ammophila

Amorpha

Amorphophallus

Ampelopsis

Amsonia

Anacyclus

Anaphalis

Anchusa

Andromeda

Andropogon

Anemanthele

Anemone

Antennaria

Anthemis

Anthericum

Anthoxanthum

Anthriscus

Anthyllis

Apium

Aquilaria

Aquilegia

Arabis

Arachnoides

Aralia

Araucaria

Arbutus

Arctanthemum

Arctostaphylos

Arenaria

Arisaema

Aristolochia

Aristotelia

Armeria

Armoracia

Arnica

Arnoglossum

Aronia

Artemisia

Arum

Aruncus

Arundo

Asimina

Asparagus

Asphodeline

Asplenium

Astelia

Aster

Astilbe

Astilboides

Astrantia

Atherosperma

Athyrium

Atriplex

Aubrieta

Aucuba

Aurinia

Azara

Azorella