Abelia

Abeliophyllum

Abies

Abutilon

Acaena

Acanthus

Acca

Acer

Achillea

Achnatherum

Aconitum

Aconogonon

Acorus

Acradenia

Actaea

Actinidia

Adenophora

Adiantum

Adina

Aegopodium

Aesculus

Aethionema

Afrocarpus

Agapanthus

Agapetes

Agarista

Agastache

Agrimonia

Ajania

Ajuga

Akebia

Alangium

Albizia

Albuca

Alcalthaea

Alcea

Alchemilla

Alchornea

Allium

Alnus

Alopecurus

Aloysia

Alstroemeria

Althaea

Alyssum

Amelanchier

Ammophila

Amorpha

Amorphophallus

Ampelopsis

Amsonia

Anacyclus

Anaphalis

Anchusa

Andromeda

Andropogon

Anemanthele

Anemone

Angelica

Antennaria

Anthemis

Anthericum

Anthoxanthum

Anthriscus

Anthyllis

Apios

Apium

Aquilegia

Arabis

Arachnoides

Aralia

Araucaria

Araujia

Arbutus

Arctanthemum

Arctostaphylos

Arenaria

Argyrocytisus

Arisaema

Aristolochia

Aristotelia

Armeria

Armoracia

Arnica

Arnoglossum

Aronia

Artemisia

Arum

Aruncus

Arundo

Asarum

Asclepias

Asimina

Asparagus

Asphodeline

Asplenium

Astelia

Aster

Astilbe

Astilboides

Astrantia

Atherosperma

Athrotaxis

Athyrium

Atriplex

Aubrieta

Aucuba

Aurinia

Azara

Azorella