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| Common Name | Scientific Name | |
| Alligatorweed | Alternanthera philoxeroides | |
| Amaranth, Palmer | Amaranthus palmeri | |
| Amaranth, Prostrate | Amaranthus blitoides | |
| Amaranth, Spiny | Amaranthus spinosus | |
| American Burnweed | Erechtites hieracifolia | |
| American Elderberry | Sambucus canadensis | |
| American Speedwell | Veronica americana | |
| American Water Plantain | Alisma subcordatum | |
| American Water Willow | Justicia americana | |
| Annual Bluegrass | Poa annua | |
| Annual Fleabane | Erigeron annuus | |
| Annual Jewgrass | Microstegium vimineum | |
| Annual Ryegrass | Lolium multiflorum | |
| Annual Sowthistle | Sonchus oleraceus | |
| Apple-of-Peru | Nicandra physalodes | |
| Arrowhead, Long-beaked | Sagittaria australis | |
| Arrowleaf Sida | Sida rhombifolia | |
| Arrow-leaved Tearthumb | Polygonum sagittatum | |
| Arthraxon, Jointhead | Arthraxon hispidus | |
| Artichoke, Jerusalem | Helianthus tuberosus | |
| Asian Dayflower | Murdannia keisak | |
| Asian Spiderwort | Murdannia keisak | |
| Asiatic Dayflower | Commelina communis | |
| Aster, White Heath | Aster pilosus | |
| Autumn Olive | Elaeagnus umbellata |
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