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| scientific name | common name(s) | image gallery |
| Achillea millefolium var. occidentalis | Western yarrow Woolly yarrow White yarrow | |
| Acalypha monostachya | Round copperleaf | |
| Acer negundo | Ash-leaf maple Ash-leaved maple Box elder Boxelder Fresno de guajuco | |
| Acmella oppositifolia var. repens | Oppositeleaf spotflower Opposite-leaf spotflower | |
| Acalypha phleoides | Shrubby copperleaf Three-seeded mercury | |
| Acalypha radians | Cardinal's feather Cardinal feather | |
| Acacia roemeriana | Roundflower catclaw Round-flower catclaw Roemer acacia Catclaw Roemer’s acacia Catclaw acacia | |
| Acacia schaffneri | Schaffner's wattle Twisted acacia | |
| Adiantum capillus-veneris | Southern maidenhair fern Common maidenhair fern Maidenhair fern Venus hair fern | |
| Adolphia infesta | Junco | |
| scientific name | common name(s) | image gallery |