| P Acanthus ilicifolius |
| P Achillea millefolium (Yarrow; Milfoil) |
| P Achillea moschata (Iva) |
| P Achyranthes aspera (Chaff Flower) |
| P Achyranthes bidentata (Chaff Flower) |
| P Acinos alpinus (Te de Sierra Nevada) |
| P Acinos sp |
| P Acinos suaveolens |
| P Acinos thymoides |
| P Acokanthera schimperi (Arrow-Poison Tree) |
| P Aconitum carmichaelii (Aconite; Fu-Tsu) |
| P Aconitum napellus (European Aconite; Monkshood; Aconite; Bear's-Foot; Blue Rocket; Friar's Cap; Garden Monkshood; Garden Wolfsbane; Helmet ) |
| P Acorus calamus (Sweetflag; Calamus; Flagroot; Myrtle Flag; Sweet Calamus; Sweetroot) |
| P Acrocomia totai (Gru-Gru Nut; Mbocaya) |
| P Acrotrema arnottianum |
| P Acrotrema uniflorum |
| P Actaea pachypoda (American Baneberry; Doll's-Eyes; White Baneberry; White Cohosh; Baneberry) |
| P Actaea rubra (Red Baneberry) |
| P Actaea spicata (European Baneberry) |
| P Actinidia chinensis (Kiwi) |