Abelia

Abeliophyllum

Abies

Acacia

Acaena

Acanthus

Acca

Acer

Achillea

Achnatherum

Aconitum

Aconogonon

Acorus

Actaea

Actinidia

Adenophora

Adiantum

Adina

Aegopodium

Aesculus

Agapanthus

Agapetes

Agarista

Agastache

Agrimonia

Ajania

Ajuga

Akebia

Alangium

Albizia

Albuca

Alcalthaea

Alcea

Alchemilla

Alchornea

Allium

Alnus

Alopecurus

Aloysia

Alstroemeria

Althaea

Alyssoides

Amarine

Amelanchier

Ammophila

Amorpha

Ampelocissus

Ampelopsis

Amsonia

Anagallis

Anaphalis

Anchusa

Andromeda

Andropogon

Anemanthele

Anemone

Angelica

Antennaria

Anthemis

Anthericum

Anthoxanthum

Anthriscus

Anthyllis

Apios

Apium

Aquilegia

Arabis

Arachnoides

Aralia

Araucaria

Arbutus

Arctanthemum

Arctostaphylos

Argyrocytisus

Aristolochia

Armeria

Armoracia

Aronia

Arrhenatherum

Artemisia

Arthropodium

Arum

Aruncus

Arundo

Asarum

Asclepias

Asimina

Asparagus

Asperula

Asphodeline

Asplenium

Astelia

Aster

Astilbe

Astilboides

Astrantia

Atherosperma

Athyrium

Atriplex

Aubrieta

Aucuba

Aurinia

Azara

Azorella