Index of plants by genus
| Species | Common Name | Family |
| Abies balsamea | Balsam Fir | Pinaceae |
| Acer negundo var. violaceum | Box Elder | Aceraceae |
| Acer pensylvanicum | Striped Maple | Aceraceae |
| Acer nigrum | Black Maple | Aceraceae |
| Acer rubrum | Red Maple | Aceraceae |
| Acer saccharinum | Silver Maple | Aceraceae |
| Acer saccharum | Sugar Maple | Aceraceae |
| Acer spicatum | Mountain Maple | Aceraceae |
| Acorus calamus | Sweet Flag | Acoraceae |
| Actea pachypoda | White Baneberry | Ranunculaceae |
| Actea rubra | Red Baneberry | Ranunculaceae |
| Adiantum pedatum | Maidenhair Fern | Pteridaceae |
| Adlumia fungosa | Allegheny Vine | Fumariaceae |
| Aesculus glabra | Ohio Buckeye | Hippocastanaceae |
| Agalinis purpurea | Purple False Foxglove | Scrophulariaceae |
| Agastache scrophulariifolia | Purple Giant Hyssop | Lamiaceae |
| Agrimonia gryposepala | Tall Agrimony | Rosaceae |
| Agrimonia parviflora | Swamp Agrimony | Rosaceae |
| Aletris farinosa | White Colicroot | Liliaceae |
| Alisma subcordatum | Water Plantain | Alismataceae |
| Allium canadense | Wild Garlic | Liliaceae |
| Allium cernuum | Prairie Onion | Liliaceae |
| Allium tricoccum | Wild Leek | Liliaceae |
| Alnus rugosa | Speckled Alder | Betulaceae |
| Ambrosia artemisiifolia | Common Ragweed | Asteraceae |
| Ambrosia trifida | Giant Ragweed | Asteraceae |
| Amelanchier arborea | Serviceberry | Rosaceae |
| Amelanchier canadensis | Canada Serviceberry | Rosaceae |
| Amelanchier sanguinea | Round-leaved Serviceberry | Rosaceae |
| Ammophila breviligulata | Marram Grass | Poaceae |
| Amorpha canescens | Leadplant | Fabaceae |
| Amorpha glabra | Indigo Bush | Fabaceae |
| Amphicarpaea bracteata | Hog Peanut | Fabaceae |
| Andromeda polifolia var. glaucophylla | Bog Rosemary | Ericaceae |
| Andropogon gerardii | Big Bluestem | Poaceae |
| Andropogon scoparius | Little Bluestem | Poaceae |
| Anemone canadensis | Canada Anemone | Ranunculaceae |
| Anemone cylindrica | Thimbleweed | Ranunculaceae |
| Anemone patens var. wolfgangiana | Pasque Flower | Ranunculaceae |
| Anemone quinquefolia | Wood Anemone | Ranunculaceae |
| Anemone virginiana | Tall Thimbleweed | Ranunculaceae |
| Angelica atropurpurea | Great Angelica | Apiaceae |
| Anomodon attenuatus | Common Tree Apron Moss | Leskeaceae |
| Antennaria neglecta | Field Pussytoes | Asteraceae |
| Antennaria plantaginifolia | Plantain-leaved Pussytoes | Asteraceae |
| Apios americana | Ground Nut | Leguminosae |
| Apocynum androsaemifolium | Spreading Dogbane | Apocynaceae |
| Apocynum cannabinum | Indian Hemp, Dogbane | Apocynaceae |
| Aquilegia canadensis | Wild Columbine | Ranunculaceae |
| Arabis lyrata | Lyreleaf Rockcress | Brassicaceae |
| Aralia hispida | Bristly Sarsaparilla | Araliaceae |
| Aralia nudicaulis | Wild Sarsaparilla | Araliaceae |
| Aralia racemosa | Spikenard | Araliaceae |
| Aralia spinosa | Devil's Walkingstick | Araliaceae |
| Arceuthobium pusillum | Eastern Dwarf Mistletoe | Viscaceae |
| Arctostaphylos uva-ursi | Bearberry | Ericaceae |
| Arenaria caroliniana | Pinebarren Sandwort | Caryophyllaceae |
| Arenaria lateriflora | Bluntleaf Sandwort | Caryophyllaceae |
| Arenaria stricta | Stiff Sandwort | Caryophyllaceae |
| Arisaema dracontium | Green Dragon | Araceae |
| Arisaema triphyllum | Jack-in-the-Pulpit | Araceae |
| Aronia arbutifolia | Red Chokeberry | Rosaceae |
| Aronia melanocarpa | Black chokeberry | Rosaceae |
| Artemisia caudata | Beach Wormwood | Asteraceae |
| Artemisia ludoviciana | Prairie Sage | Asteraceae |
| Asarum canadense | Wild Ginger | Aristolochiaceae |
| Asclepias incarnata | Swamp Milkweed | Asclepiadaceae |
| Asclepias purpurascens | Purple Milkweed | Asclepiadaceae |
| Asclepias syriaca | Common Milkweed | Asclepiadaceae |
| Asclepias tuberosa | Butterflyweed | Asclepiadaceae |
| Asclepias verticillata | Whorled Milkweed | Asclepiadaceae |
| Asclepias viridiflora | Short Green Milkweed | Asclepiadaceae |
| Asimina triloba | Papaw | Annonaceae |
| Asplenium platyneuron | Ebony Spleenwort | Aspleniaceae |
| Asplenium rhizophyllum | Walking Fern | Aspleniaceae |
| Asplenium scolopendrium | American Hart's Tonguefern | Aspleniaceae |
| Asplenium trichomanes | Maidenhair Spleenwort | Aspleniaceae |
| Aster acuminatus | Whorled Wood Aster | Asteraceae |
| Aster azureus | Sky Blue Aster | Asteraceae |
| Aster borealis | Rush Aster | Asteraceae |
| Aster laevis | Smooth Blue Aster | Asteraceae |
| Aster novae-angliae | New England Aster | Asteraceae |
| Astragalus canadensis | Canadian Milk Vetch | Fabaceae |
| Athyrium filix-femina | Lady Fern | Dryopteridaceae |
| Atrichum angustatum | Lesser Smoothcap Moss | Polytrichaceae |
| Atrichum undulatum | Common Smoothcap Moss | Polytrichaceae |
| Aureolaria grandiflora | Large Yellow False Foxglove | Scrophulariaceae |
© 2004-2009 Michael Hough