| P Actinidia polygama (Cat Powder; Silver Vine) |
| P Adansonia digitata |
| P Adenocarpus complicatus |
| P Adenocarpus decorticans |
| P Adenocarpus foliolosus |
| P Adiantum capillus-veneris (Maidenhair Fern) |
| P Adiantum pedatum (American Maidenhair) |
| P Adonis vernalis (Spring Adonis) |
| P Aegle marmelos (Bael de India; Bael fruit) |
| P Aeolanthus myriantha (Ninde) |
| P Aerva lanata |
| P Aesculus hippocastanum (Horse Chestnut) |
| P Aethusa cynapium (Fool's Parsley) |
| P Agastache foeniculum (Giant Hyssop) |
| P Agastache nepetoides |
| P Agastache pallidiflora |
| P Agastache rugosa |
| P Agastache urticifolia (Nettle-Leaf Giant Hyssop) |
| P Agathosma betulina (Buchu; Honey Buchu; Mountain Buchu) |
| P Agave americana (Century Plant; Maguey) |