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| scientific name | common name(s) | image gallery |
| Aconitum noveboracense | Northern blue monkshood New York monkshood | |
| Actaea pachypoda | White baneberry Dolls eyes | |
| Acer pensylvanicum | Striped maple Moosewood | |
| Acer rubrum | Red maple Scarlet maple | |
| Acer saccharinum | Silver maple Soft maple White maple | |
| Acer saccharum | Sugar maple Northern sugar maple | |
| Adiantum pedatum | Northern maidenhair Maidenhair Fern | |
| Aesculus flava | Sweet buckeye Yellow buckeye | |
| Aesculus pavia | Scarlet Buckeye Red buckeye Firecracker plant | |
| Aesculus parviflora | Bottlebrush buckeye | |
| Ageratina altissima | White snakeroot | |
| Agastache scrophulariifolia | Purple giant hyssop Purple giant-hyssop | |
| Allium canadense | Meadow garlic Wild garlic Wild onion | |
| Allium cernuum | Nodding onion | |
| Alnus incana ssp. rugosa | Speckled alder | |
| Alnus serrulata | Hazel alder Brookside alder Tag alder Common alder | |
| Alisma subcordatum | American water plantain | |
| Allium tricoccum | Wild leek Ramp | |
| Amelanchier arborea | Common serviceberry Downy serviceberry Shadbush Juneberry | |
| Amelanchier canadensis | Canadian serviceberry Canadian service-berry Shadblow serviceberry Juneberry | |
| Amorpha canescens | Leadplant Leadplant amorpha Prairie shoestring | |
| Amorpha fruticosa | Indigo bush False indigo bush False indigo Desert false indigo | |
| Amelanchier laevis | Allegheny service-berry Allegheny serviceberry Serviceberry | |
| Amelanchier stolonifera | Running serviceberry | |
| Amsonia tabernaemontana | Eastern bluestar Blue dogbane Willow amsonia Woodland bluestar | |
| scientific name | common name(s) | image gallery |