A
- Abies balsamea var. balsamea (N)
- Abutilon theophrasti (I)
- Acalypha deamii (N)
- Acalypha gracilens (N)
- Acalypha ostryifolia (N)
- Acalypha rhomboidea (N)
- Acalypha virginica (N)
- Acer campestre (I)
- Acer × freemanii (N)
- Acer ginnala (I)
- Acer negundo var. negundo (N)
- Acer negundo var. violaceum (N)
- Acer nigrum (N)
- Acer palmatum (I)
- Acer pensylvanicum (N)
- Acer platanoides (I)
- Acer rubrum var. rubrum (N)
- Acer rubrum var. trilobum (N)
- Acer saccharinum (N)
- Acer saccharum var. saccharum (N)
- Acer spicatum (N)
- Acer tataricum (I)
- Achillea millefolium var. occidentalis (N)
- Achillea millefolium var. millefolium (I)
- Achillea ptarmica (I)
- Achyranthes japonica var. hachijoensis (I)
- Acinos arvensis (I)
- Aconitum noveboracense (N)
- Aconitum uncinatum ssp. uncinatum (N)
- Acorus americanus (N)
- Acorus calamus (I)
- Acroptilon repens (I)
- Actaea pachypoda (N)
- Actaea racemosa var. racemosa (N)
- Actaea rubra ssp. rubra (N)
- Actinidia arguta (I)
- Adiantum capillus-veneris (N)
- Adiantum pedatum (N)
- Adlumia fungosa (N)
- Aegilops cylindrica (I)
- Aegopodium podagraria (I)
- Aesculus flava (N)
- Aesculus glabra var. glabra (N)
- Aesculus hippocastanum (I)
- Aesculus × marylandica (N)
- Aethusa cynapium (I)
- Agalinis auriculata (N)
- Agalinis gattingeri (N)
- Agalinis paupercula var. borealis (N)
- Agalinis paupercula var. paupercula (N)
- Agalinis purpurea (N)
- Agalinis skinneriana (N)
- Agalinis tenuifolia var. macrophylla (N)
- Agalinis tenuifolia var. parviflora (N)
- Agalinis tenuifolia var. tenuifolia (N)
- Agastache nepetoides (N)
- Agastache scrophulariifolia (N)
- Ageratina altissima var. altissima (N)
- Ageratina aromatica var. aromatica (N)
- Agrimonia eupatoria (I)
- Agrimonia gryposepala (N)
- Agrimonia microcarpa (N)
- Agrimonia parviflora (N)
- Agrimonia pubescens (N)
- Agrimonia rostellata (N)
- Agrimonia striata (N)
- Agropyron desertorum (I)
- Agrostemma githago (I)
- Agrostis avenacea (I)
- Agrostis capillaris (I)
- Agrostis elliottiana (N)
- Agrostis gigantea (I)
- Agrostis hyemalis (N)
- Agrostis perennans (N)
- Agrostis scabra (N)
- Agrostis stolonifera (I)
- Ailanthus altissima (I)
- Aira caryophyllea var. caryophyllea (I)
- Ajuga genevensis (I)
- Ajuga reptans (I)
- Akebia quinata (I)
- Albizia julibrissin (I)
- Alcea rosea (I)
- Aletris farinosa (N)
- Alisma subcordatum (N)
- Alisma triviale (N)
- Alliaria petiolata (I)
- Allium ampeloprasum (I)
- Allium burdickii (N)
- Allium canadense var. canadense (N)
- Allium cepa (I)
- Allium cernuum var. cernuum (N)
- Allium porrum (I)
- Allium sativum (I)
- Allium schoenoprasum (I)
- Allium schoenoprasum var. sibiricum (N)
- Allium tricoccum (N)
- Allium vineale ssp. vineale (I)
- Alnus × fallacina (N)
- Alnus glutinosa (I)
- Alnus incana ssp. rugosa (N)
- Alnus serrulata (N)
- Alopecurus aequalis var. aequalis (N)
- Alopecurus carolinianus (N)
- Alopecurus geniculatus var. geniculatus (I)
- Alopecurus myosuroides (I)
- Alopecurus myosuroides (N)
- Alopecurus pratensis (I)
- Althaea officinalis (I)
- Alyssum alyssoides (I)
- Amaranthus albus (I)
- Amaranthus blitoides (I)
- Amaranthus blitum var. emarginatus (I)
- Amaranthus cruentus (I)
- Amaranthus deflexus (I)
- Amaranthus hybridus (N)
- Amaranthus palmeri (N)
- Amaranthus powellii ssp. powellii (N)
- Amaranthus retroflexus (N)
- Amaranthus spinosus (N)
- Amaranthus tuberculatus (N)
- Ambrosia artemisiifolia var. elatior (N)
- Ambrosia artemisiifolia var. elatior (I)
- Ambrosia bidentata (N)
- Ambrosia × helenae (N)
- Ambrosia trifida var. trifida (N)
- Amelanchier arborea var. arborea (N)
- Amelanchier interior (N)
- Amelanchier laevis (N)
- Amelanchier sanguinea var. sanguinea (N)
- Amelanchier stolonifera (N)
- Ammannia coccinea (N)
- Ammannia robusta (N)
- Ammophila breviligulata (N)
- Amorpha fruticosa (N)
- Ampelopsis aconitifolia (I)
- Ampelopsis arborea (N)
- Ampelopsis brevipedunculata (I)
- Ampelopsis cordata (N)
- Amphiachyris dracunculoides (N)
- Amphicarpaea bracteata var. bracteata (N)
- Amphicarpaea bracteata var. comosa (N)
- Amsinckia lycopsoides (N)
- Amsonia tabernaemontana var. salicifolia (N)
- Anagallis arvensis ssp. foemina (N)
- Anagallis arvensis ssp. arvensis (I)
- Anagallis arvensis ssp. foemina (I)
- Anagallis minima (N)
- Anaphalis margaritacea (N)
- Anchusa arvensis (I)
- Anchusa azurea (I)
- Anchusa officinalis (I)
- Andromeda polifolia var. glaucophylla (N)
- Andropogon gerardii (N)
- Andropogon glomeratus var. glomeratus (N)
- Andropogon gyrans var. gyrans (N)
- Andropogon virginicus var. virginicus (N)
- Androsace occidentalis (N)
- Anemone blanda (I)
- Anemone canadensis (N)
- Anemone cylindrica (N)
- Anemone quinquefolia var. bifolia (N)
- Anemone quinquefolia var. quinquefolia (N)
- Anemone virginiana var. virginiana (N)
- Anethum graveolens (I)
- Angelica atropurpurea (N)
- Angelica venenosa (N)
- Anoda cristata (N)
- Antennaria howellii ssp. canadensis (N)
- Antennaria howellii ssp. neodioica (N)
- Antennaria howellii ssp. petaloidea (N)
- Antennaria neglecta (N)
- Antennaria parlinii ssp. fallax (N)
- Antennaria parlinii ssp. parlinii (N)
- Antennaria plantaginifolia (N)
- Antennaria solitaria (N)
- Antennaria virginica (N)
- Anthemis arvensis (I)
- Anthemis cotula (I)
- Anthemis tinctoria (I)
- Anthoxanthum aristatum (I)
- Anthoxanthum odoratum ssp. odoratum (I)
- Anthriscus caucalis (I)
- Anthriscus sylvestris (I)
- Anthyllis vulneraria (I)
- Antirrhinum majus (I)
- Apera interrupta (I)
- Apera spica-venti (I)
- Apios americana (N)
- Apium graveolens var. dulce (N)
- Apium graveolens var. dulce (I)
- Aplectrum hyemale (N)
- Apocynum androsaemifolium (N)
- Apocynum cannabinum (N)
- Apocynum × floribundum (N)
- Aquilegia canadensis (N)
- Aquilegia vulgaris (I)
- Arabidopsis thaliana (I)
- Arabis canadensis (N)
- Arabis × divaricarpa (N)
- Arabis drummondii (N)
- Arabis glabra (N)
- Arabis hirsuta var. pycnocarpa (N)
- Arabis laevigata var. laevigata (N)
- Arabis lyrata (N)
- Arabis missouriensis (N)
- Arabis patens (N)
- Arabis shortii (N)
- Aralia elata (I)
- Aralia hispida (N)
- Aralia nudicaulis (N)
- Aralia racemosa ssp. racemosa (N)
- Aralia spinosa (N)
- Arctium lappa (I)
- Arctium minus (I)
- Arctostaphylos uva-ursi (N)
- Arenaria serpyllifolia (I)
- Arethusa bulbosa (N)
- Argemone albiflora ssp. albiflora (N)
- Argemone mexicana (N)
- Argentina anserina (N)
- Arisaema dracontium (N)
- Arisaema triphyllum ssp. pusillum (N)
- Arisaema triphyllum ssp. stewardsonii (N)
- Arisaema triphyllum ssp. triphyllum (N)
- Aristida dichotoma var. dichotoma (N)
- Aristida longespica var. geniculata (N)
- Aristida longespica var. longespica (N)
- Aristida oligantha (N)
- Aristida purpurascens var. purpurascens (N)
- Aristida ramosissima (N)
- Aristolochia clematitis (I)
- Aristolochia serpentaria (N)
- Aristolochia tomentosa (N)
- Armoracia rusticana (I)
- Arnoglossum atriplicifolium (N)
- Arnoglossum plantagineum (N)
- Arnoglossum reniforme (N)
- Arnoseris minima (I)
- Arrhenatherum elatius var. elatius (I)
- Artemisia absinthium (I)
- Artemisia annua (I)
- Artemisia biennis (N)
- Artemisia biennis var. biennis (I)
- Artemisia campestris ssp. borealis var. borealis (N)
- Artemisia campestris ssp. caudata (N)
- Artemisia gmelinii (I)
- Artemisia ludoviciana ssp. albula (N)
- Artemisia ludoviciana ssp. ludoviciana (N)
- Artemisia pontica (I)
- Artemisia stelleriana (I)
- Artemisia stelleriana (N)
- Artemisia vulgaris (N)
- Artemisia vulgaris var. vulgaris (I)
- Arthraxon hispidus (I)
- Aruncus dioicus (I)
- Aruncus dioicus var. dioicus (N)
- Arundinaria gigantea ssp. gigantea (N)
- Asarum canadense (N)
- Asclepias amplexicaulis (N)
- Asclepias exaltata (N)
- Asclepias hirtella (N)
- Asclepias incarnata ssp. incarnata (N)
- Asclepias purpurascens (N)
- Asclepias quadrifolia (N)
- Asclepias sullivantii (N)
- Asclepias syriaca (N)
- Asclepias tuberosa ssp. interior (N)
- Asclepias tuberosa ssp. tuberosa (N)
- Asclepias variegata (N)
- Asclepias verticillata (N)
- Asclepias viridiflora (N)
- Asclepias viridis (N)
- Asimina triloba (N)
- Asparagus officinalis (I)
- Asperugo procumbens (I)
- Asplenium bradleyi (N)
- Asplenium × clermontiae (N)
- Asplenium × ebenoides (N)
- Asplenium × gravesii (N)
- Asplenium × inexpectatum (N)
- Asplenium × kentuckiense (N)
- Asplenium montanum (N)
- Asplenium pinnatifidum (N)
- Asplenium platyneuron var. platyneuron (N)
- Asplenium resiliens (N)
- Asplenium rhizophyllum (N)
- Asplenium ruta-muraria var. cryptolepis (N)
- Asplenium ruta-muraria var. lanceolum (N)
- Asplenium trichomanes ssp. quadrivalens (N)
- Asplenium trichomanes ssp. trichomanes (N)
- Asplenium × trudellii (N)
- Aster tataricus (I)
- Astragalus canadensis var. canadensis (N)
- Astragalus neglectus (N)
- Athyrium filix-femina ssp. angustum (N)
- Athyrium filix-femina ssp. asplenioides (N)
- Atriplex hortensis (I)
- Atriplex patula (I)
- Atriplex prostrata (N)
- Atriplex rosea (I)
- Aureolaria flava var. flava (N)
- Aureolaria flava var. macrantha (N)
- Aureolaria laevigata (N)
- Aureolaria pedicularia var. ambigens (N)
- Aureolaria pedicularia var. pedicularia (N)
- Aureolaria virginica (N)
- Aurinia saxatilis (I)
- Avena fatua (I)
- Avena sativa (I)
- Azolla caroliniana (N)
Read more about this topic: Flora Of Ohio