Rhus typhina 
Aaronsohnia factorovskyi 
Abbotswood Cinquefoil 
Abutilon hirtum 
Acacia angustissima 
Acacia nilotica 
Acacia pachyceras 
Acacia peuce 
Acacia raddiana 
Acalypha wilkesiana 
Acantholepis orientalis 
Acanthostachys strobilacea 
Acanthus hirsutus 
Acanthus syriacus 
Acer circinatum 
Acer platanoides 
Acer tataricum 
Acetabularia major 
Achillea cretica 
Achiote 
Achlys triphylla 
Ackee apple 
Aconitum nasutum 
Acostaea costaricensis