A | B | C | D | E | F | G | H | CH | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
This list includes plants native and introduced to the state of Ohio, designated (N) and (I), respectively. Varieties and subspecies link to their parent species.
A
- Abies balsamea var. balsamea (I)
- 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, synonym of Clinopodium acinos (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)
- Adenocaulon bicolor (N)
- 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 glandulosa var. 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 gerardi (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 levigata (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)
B
- Ballota nigra var. alba (I)
- Baptisia alba var. macrophylla (N)
- Baptisia australis var. australis (N)
- Baptisia tinctoria (N)
- Barbarea verna (I)
- Barbarea vulgaris (I)
- Bartonia virginica (N)
- Bassia hirsuta (I)
- Bassia scoparia (I)
- Beckmannia syzigachne (N)
- Belamcanda chinensis (I)
- Bellis perennis (I)
- Berberis × ottawensis (N)
- Berberis thunbergii (I)
- Berberis vulgaris (I)
- Berteroa incana (I)
- Besseya bullii (N)
- Betula alleghaniensis var. alleghaniensis (N)
- Betula alleghaniensis var. macrolepis (N)
- Betula lenta (N)
- Betula nigra (N)
- Betula papyrifera var. papyrifera (N)
- Betula pendula (I)
- Betula populifolia (N)
- Betula pubescens (N)
- Betula pubescens ssp. pubescens (I)
- Betula pumila var. pumila (N)
- Betula × purpusii (N)
- Bidens aristosa (N)
- Bidens beckii (N)
- Bidens bipinnata (N)
- Bidens cernua (N)
- Bidens connata (N)
- Bidens coronata (N)
- Bidens discoidea (N)
- Bidens frondosa (N)
- Bidens laevis (N)
- Bidens tripartita (N)
- Bidens vulgata (N)
- Bignonia capreolata (N)
- Blephilia ciliata (N)
- Blephilia hirsuta var. hirsuta (N)
- Boehmeria cylindrica (N)
- Boltonia asteroides var. recognita (N)
- Borago officinalis (I)
- Botrychium biternatum (N)
- Botrychium dissectum (N)
- Botrychium lanceolatum var. angustisegmentum (N)
- Botrychium matricariifolium (N)
- Botrychium multifidum (N)
- Botrychium oneidense (N)
- Botrychium simplex (N)
- Botrychium virginianum (N)
- Bouteloua curtipendula var. curtipendula (N)
- Bouteloua gracilis (N)
- Bouteloua hirsuta var. hirsuta (N)
- Brachyelytrum erectum (N)
- Brasenia schreberi (N)
- Brassica juncea (I)
- Brassica napus (I)
- Brassica nigra (I)
- Brassica oleracea (I)
- Brassica rapa var. amplexicaulis (I)
- Brassica rapa var. rapa (I)
- Brickellia eupatorioides var. corymbulosa (N)
- Brickellia eupatorioides var. eupatorioides (N)
- Bromus arvensis (I)
- Bromus briziformis (I)
- Bromus catharticus (I)
- Bromus ciliatus var. ciliatus (N)
- Bromus erectus (I)
- Bromus hordeaceus ssp. hordeaceus (I)
- Bromus inermis (N)
- Bromus inermis ssp. inermis var. inermis (I)
- Bromus kalmii (N)
- Bromus latiglumis (N)
- Bromus nottowayanus (N)
- Bromus pubescens (N)
- Bromus racemosus (I)
- Bromus secalinus var. secalinus (I)
- Bromus sterilis (I)
- Bromus tectorum (I)
- Broussonetia papyrifera (I)
- Browallia americana (I)
- Brunnera macrophylla (I)
- Buchnera americana (N)
- Buddleja davidii (I)
- Buglossoides arvensis (I)
- Bulbostylis capillaris ssp. capillaris (N)
- Bunias orientalis (I)
- Bupleurum lancifolium (I)
- Bupleurum rotundifolium (I)
- Butomus umbellatus (I)
- Buxus sempervirens (I)
C
- Cabomba caroliniana var. caroliniana (N)
- Cakile edentula ssp. edentula var. lacustris (N)
- Cakile edentula ssp. edentula (N)
- Calamagrostis canadensis var. canadensis (N)
- Calamagrostis canadensis var. macouniana (N)
- Calamagrostis coarctata (N)
- Calamagrostis porteri ssp. insperata (N)
- Calamagrostis stricta ssp. inexpansa (N)
- Calamovilfa longifolia var. magna (N)
- Calendula officinalis (I)
- Calla palustris (N)
- Callitriche heterophylla ssp. heterophylla (N)
- Callitriche palustris (N)
- Callitriche terrestris (N)
- Calluna vulgaris (I)
- Calopogon tuberosus var. tuberosus (N)
- Caltha palustris var. palustris (N)
- Calycanthus floridus var. glaucus (N)
- Calystegia hederacea (I)
- Calystegia sepium ssp. americana (N)
- Calystegia sepium ssp. angulata (N)
- Calystegia sepium ssp. sepium (I)
- Calystegia silvatica (I)
- Calystegia silvatica ssp. fraterniflora (N)
- Calystegia spithamaea ssp. spithamaea (N)
- Camassia scilloides (N)
- Camelina microcarpa (I)
- Camelina sativa ssp. sativa (I)
- Campanula aparinoides (N)
- Campanula rapunculoides (I)
- Campanula rotundifolia (N)
- Campanula trachelium (I)
- Campanulastrum americanum (N)
- Campsis radicans (N)
- Cannabis sativa ssp. sativa var. sativa (I)
- Capsella bursa-pastoris (I)
- Cardamine angustata (N)
- Cardamine bulbifera (I)
- Cardamine bulbosa (N)
- Cardamine concatenata (N)
- Cardamine diphylla (N)
- Cardamine dissecta (N)
- Cardamine douglassii (N)
- Cardamine flexuosa (I)
- Cardamine hirsuta (I)
- Cardamine impatiens (I)
- Cardamine maxima (N)
- Cardamine parviflora var. arenicola (N)
- Cardamine pensylvanica (N)
- Cardamine pratensis var. pratensis (N)
- Cardamine rotundifolia (N)
- Cardaria draba (I)
- Cardiospermum halicacabum (I)
- Carduus acanthoides (I)
- Carduus crispus (I)
- Carduus nutans (I)
- Carex aggregata (N)
- Carex alata (N)
- Carex albicans var. albicans (N)
- Carex albicans var. emmonsii (N)
- Carex albolutescens (N)
- Carex albursina (N)
- Carex alopecoidea (N)
- Carex amphibola (N)
- Carex annectens (N)
- Carex appalachica (N)
- Carex aquatilis var. aquatilis (N)
- Carex arctata (N)
- Carex argyrantha (N)
- Carex atherodes (N)
- Carex atlantica ssp. atlantica (N)
- Carex atlantica ssp. capillacea (N)
- Carex aurea (N)
- Carex bebbii (N)
- Carex bicknellii (N)
- Carex blanda (N)
- Carex brevior (N)
- Carex bromoides ssp. bromoides (N)
- Carex brunnescens ssp. sphaerostachya (N)
- Carex bushii (N)
- Carex buxbaumii (N)
- Carex canescens ssp. canescens (N)
- Carex canescens ssp. disjuncta (N)
- Carex careyana (N)
- Carex caroliniana (N)
- Carex cephaloidea (N)
- Carex cephalophora (N)
- Carex communis var. communis (N)
- Carex comosa (N)
- Carex conjuncta (N)
- Carex conoidea (N)
- Carex crawei (N)
- Carex crinita var. brevicrinis (N)
- Carex crinita var. crinita (N)
- Carex cristatella (N)
- Carex crus-corvi (N)
- Carex cryptolepis (N)
- Carex cumberlandensis (N)
- Carex davisii (N)
- Carex debilis var. debilis (N)
- Carex debilis var. rudgei (N)
- Carex decomposita (N)
- Carex deweyana var. deweyana (N)
- Carex diandra (N)
- Carex digitalis var. digitalis (N)
- Carex disperma (N)
- Carex eburnea (N)
- Carex echinata ssp. echinata (N)
- Carex emoryi (N)
- Carex festucacea (N)
- Carex flava (N)
- Carex folliculata (N)
- Carex formosa (N)
- Carex frankii (N)
- Carex garberi (N)
- Carex glaucodea (N)
- Carex gracilescens (N)
- Carex gracillima (N)
- Carex granularis (N)
- Carex grayi (N)
- Carex grisea (N)
- Carex gynandra (N)
- Carex haydenii (N)
- Carex hirsutella (N)
- Carex hirtifolia (N)
- Carex hitchcockiana (N)
- Carex hyalinolepis (N)
- Carex hystericina (N)
- Carex interior (N)
- Carex intumescens (N)
- Carex jamesii (N)
- Carex juniperorum (N)
- Carex lacustris (N)
- Carex laevivaginata (N)
- Carex lasiocarpa var. americana (N)
- Carex laxiculmis var. copulata (N)
- Carex laxiculmis var. laxiculmis (N)
- Carex laxiflora var. laxiflora (N)
- Carex leavenworthii (N)
- Carex leptalea ssp. leptalea (N)
- Carex leptonervia (N)
- Carex limosa (N)
- Carex longii (N)
- Carex louisianica (N)
- Carex lucorum var. lucorum (N)
- Carex lupuliformis (N)
- Carex lupulina (N)
- Carex lurida (N)
- Carex magellanica ssp. irrigua (N)
- Carex meadii (N)
- Carex merritt-fernaldii (N)
- Carex mesochorea (N)
- Carex molesta (N)
- Carex muehlenbergii var. enervis (N)
- Carex muehlenbergii var. muehlenbergii (N)
- Carex muskingumensis (N)
- Carex nigromarginata (N)
- Carex normalis (N)
- Carex oligocarpa (N)
- Carex oligosperma var. oligosperma (N)
- Carex pallescens (N)
- Carex peckii (N)
- Carex pedunculata (N)
- Carex pellita (N)
- Carex pensylvanica (N)
- Carex planispicata (N)
- Carex plantaginea (N)
- Carex platyphylla (N)
- Carex praegracilis (N)
- Carex prairea (N)
- Carex prasina (N)
- Carex projecta (N)
- Carex pseudocyperus (N)
- Carex purpurifera (N)
- Carex radiata (N)
- Carex retroflexa (N)
- Carex retrorsa (N)
- Carex richardsonii (N)
- Carex rosea (N)
- Carex sartwellii var. sartwellii (N)
- Carex scabrata (N)
- Carex scoparia var. scoparia (N)
- Carex seorsa (N)
- Carex shortiana (N)
- Carex siccata (N)
- Carex sparganioides (N)
- Carex spicata (I)
- Carex sprengelii (N)
- Carex squarrosa (N)
- Carex sterilis (N)
- Carex stipata var. maxima (N)
- Carex stipata var. stipata (N)
- Carex straminea (N)
- Carex striatula (N)
- Carex stricta (N)
- Carex styloflexa (N)
- Carex suberecta (N)
- Carex × subimpressa (N)
- Carex × sullivantii (N)
- Carex swanii (N)
- Carex tenera (N)
- Carex tenuiflora (N)
- Carex tetanica (N)
- Carex texensis (N)
- Carex timida (N)
- Carex tonsa var. rugosperma (N)
- Carex torta (N)
- Carex tribuloides var. tribuloides (N)
- Carex trichocarpa (N)
- Carex trisperma var. trisperma (N)
- Carex tuckermanii (N)
- Carex typhina (N)
- Carex umbellata (N)
- Carex utriculata (N)
- Carex vesicaria var. monile (N)
- Carex virescens (N)
- Carex viridula ssp. viridula (N)
- Carex vulpinoidea var. vulpinoidea (N)
- Carex willdenowii (N)
- Carex woodii (N)
- Carpinus caroliniana ssp. virginiana (N)
- Carthamus tinctorius (I)
- Carum carvi (I)
- Carya alba (N)
- Carya × brownii (N)
- Carya cordiformis (N)
- Carya glabra (N)
- Carya illinoinensis (N)
- Carya laciniosa (N)
- Carya ovalis (N)
- Carya ovata (N)
- Castanea dentata (N)
- Castanea pumila var. pumila (N)
- Castilleja coccinea (N)
- Catalpa bignonioides (N)
- Catalpa ovata (I)
- Catalpa speciosa (N)
- Caulophyllum giganteum (N)
- Caulophyllum thalictroides (N)
- Ceanothus americanus (N)
- Ceanothus herbaceus (N)
- Celastrus orbiculatus (I)
- Celastrus scandens (N)
- Celosia argentea (I)
- Celtis occidentalis (N)
- Celtis tenuifolia (N)
- Cenchrus longispinus (N)
- Centaurea cyanus (I)
- Centaurea diffusa (I)
- Centaurea jacea (I)
- Centaurea nigra (I)
- Centaurea nigrescens (I)
- Centaurea phrygia (I)
- Centaurea scabiosa (I)
- Centaurea solstitialis (I)
- Centaurea stoebe ssp. micranthos (I)
- Centaurea transalpina (N)
- Centaurium erythraea (I)
- Centaurium pulchellum (I)
- Centella erecta (N)
- Cephalanthus occidentalis (N)
- Cerastium arvense (I)
- Cerastium arvense ssp. strictum (N)
- Cerastium arvense ssp. velutinum var. velutinum (N)
- Cerastium arvense ssp. velutinum (N)
- Cerastium brachypetalum (I)
- Cerastium dubium (I)
- Cerastium fontanum ssp. vulgare (I)
- Cerastium glomeratum (I)
- Cerastium nutans var. nutans (N)
- Cerastium pumilum (I)
- Cerastium semidecandrum (I)
- Cerastium tomentosum (I)
- Ceratocephala testiculata (I)
- Ceratophyllum demersum (N)
- Ceratophyllum echinatum (N)
- Cercidiphyllum japonicum (I)
- Cercis canadensis var. canadensis (N)
- Chaenomeles speciosa (I)
- Chaenorhinum minus (I)
- Chaerophyllum procumbens var. procumbens (N)
- Chaerophyllum procumbens var. shortii (N)
- Chaerophyllum tainturieri var. tainturieri (N)
- Chaiturus marrubiastrum (I)
- Chamaecrista fasciculata var. fasciculata (N)
- Chamaecrista nictitans ssp. nictitans var. nictitans (N)
- Chamaecrista nictitans ssp. nictitans (N)
- Chamaedaphne calyculata (N)
- Chamaelirium luteum (N)
- Chamaemelum mixtum (I)
- Chamaemelum nobile (I)
- Chamaesyce humistrata (N)
- Chamaesyce maculata (N)
- Chamaesyce nutans (N)
- Chamaesyce polygonifolia (N)
- Chamaesyce prostrata (N)
- Chamaesyce serpens (N)
- Chamaesyce vermiculata (N)
- Chamerion angustifolium ssp. circumvagum (N)
- Chasmanthium latifolium (N)
- Chelidonium majus var. majus (I)
- Chelone glabra (N)
- Chenopodium album var. missouriense (N)
- Chenopodium album var. album (I)
- Chenopodium ambrosioides var. ambrosioides (I)
- Chenopodium berlandieri var. bushianum (N)
- Chenopodium berlandieri var. zschackii (N)
- Chenopodium botrys (I)
- Chenopodium capitatum (N)
- Chenopodium glaucum (I)
- Chenopodium glaucum (N)
- Chenopodium humile (I)
- Chenopodium humile (N)
- Chenopodium incanum var. incanum (N)
- Chenopodium murale (I)
- Chenopodium polyspermum var. acutifolium (I)
- Chenopodium pratericola (N)
- Chenopodium pumilio (I)
- Chenopodium simplex (N)
- Chenopodium standleyanum (N)
- Chenopodium subglabrum (N)
- Chenopodium urbicum (I)
- Chenopodium vulvaria (I)
- Chimaphila maculata (N)
- Chimaphila umbellata ssp. cisatlantica (N)
- Chionanthus virginicus (N)
- Chloris verticillata (N)
- Chloris virgata (N)
- Chorispora tenella (I)
- Chrysanthemum × morifolium (I)
- Chrysogonum virginianum var. virginianum (N)
- Chrysopsis mariana (N)
- Chrysosplenium americanum (N)
- Cichorium intybus (I)
- Cicuta bulbifera (N)
- Cicuta maculata var. maculata (N)
- Cinna arundinacea (N)
- Cinna latifolia (N)
- Circaea alpina ssp. alpina (N)
- Circaea × intermedia (N)
- Circaea lutetiana ssp. canadensis (N)
- Cirsium altissimum (N)
- Cirsium arvense (I)
- Cirsium canescens (N)
- Cirsium carolinianum (N)
- Cirsium discolor (N)
- Cirsium muticum (N)
- Cirsium pumilum (N)
- Cirsium vulgare (I)
- Citrullus lanatus var. lanatus (I)
- Cladium mariscoides (N)
- Cladrastis kentukea (N)
- Clarkia pulchella (N)
- Claytonia caroliniana var. caroliniana (N)
- Claytonia virginica var. virginica (N)
- Clematis occidentalis var. occidentalis (N)
- Clematis terniflora (I)
- Clematis viorna (N)
- Clematis virginiana (N)
- Cleome hassleriana (I)
- Cleome serrulata (N)
- Clinopodium arkansanum (N)
- Clinopodium vulgare (N)
- Clintonia borealis (N)
- Clintonia umbellulata (N)
- Clitoria mariana (N)
- Coix lacryma-jobi (I)
- Collinsia verna (N)
- Collinsonia canadensis (N)
- Collinsonia verticillata (N)
- Collomia linearis (N)
- Colutea arborescens (I)
- Comandra umbellata ssp. umbellata (N)
- Comarum palustre (N)
- Commelina communis (I)
- Commelina diffusa var. diffusa (N)
- Commelina virginica (N)
- Comptonia peregrina (N)
- Conioselinum chinense (N)
- Conium maculatum (I)
- Conoclinium coelestinum (N)
- Conopholis americana (N)
- Conringia orientalis (I)
- Consolida ajacis (I)
- Consolida regalis (I)
- Convallaria majalis (I)
- Convolvulus arvensis (I)
- Conyza canadensis var. canadensis (N)
- Conyza canadensis var. pusilla (N)
- Conyza ramosissima (N)
- Coptis trifolia (N)
- Corallorhiza maculata var. maculata (N)
- Corallorhiza odontorhiza var. odontorhiza (N)
- Corallorhiza trifida (N)
- Corallorhiza wisteriana (N)
- Coreopsis grandiflora var. harveyana (N)
- Coreopsis lanceolata (N)
- Coreopsis major (N)
- Coreopsis tinctoria var. tinctoria (N)
- Coreopsis tripteris (N)
- Coreopsis verticillata (N)
- Coriandrum sativum (I)
- Corispermum americanum var. americanum (N)
- Corispermum pallasii (I)
- Corispermum pallasii (N)
- Cornus alternifolia (N)
- Cornus amomum (N)
- Cornus × arnoldiana (N)
- Cornus canadensis (N)
- Cornus drummondii (N)
- Cornus florida (N)
- Cornus obliqua (N)
- Cornus racemosa (N)
- Cornus rugosa (N)
- Cornus sericea ssp. sericea (N)
- Coronilla scorpioides (I)
- Coronopus didymus (I)
- Corydalis aurea (N)
- Corydalis flavula (N)
- Corydalis sempervirens (N)
- Corylus americana (N)
- Corylus cornuta var. cornuta (N)
- Cosmos bipinnatus (I)
- Cotinus coggygria (I)
- Cotoneaster divaricatus (I)
- Cotoneaster simonsii (I)
- Crataegus × anomala (N)
- Crataegus apiomorpha (N)
- Crataegus arborea (N)
- Crataegus ater (N)
- Crataegus beata (N)
- Crataegus brainerdii (N)
- Crataegus calpodendron (N)
- Crataegus chrysocarpa var. chrysocarpa (N)
- Crataegus coleae (N)
- Crataegus compacta (N)
- Crataegus compta (N)
- Crataegus corusca (N)
- Crataegus crus-galli (N)
- Crataegus disperma (N)
- Crataegus dissona (N)
- Crataegus engelmannii (N)
- Crataegus flabellata (N)
- Crataegus holmesiana (N)
- Crataegus × hudsonica (N)
- Crataegus × immanis (N)
- Crataegus indicens (N)
- Crataegus intricata (N)
- Crataegus iracunda (N)
- Crataegus irrasa (N)
- Crataegus jesupii (N)
- Crataegus lucorum (N)
- Crataegus macrosperma (N)
- Crataegus margarettiae (N)
- Crataegus mollis (N)
- Crataegus monogyna (I)
- Crataegus nitida (N)
- Crataegus pedicellata (N)
- Crataegus pennsylvanica (N)
- Crataegus persimilis (N)
- Crataegus phaenopyrum (N)
- Crataegus pringlei (N)
- Crataegus prona (N)
- Crataegus pruinosa (N)
- Crataegus punctata (N)
- Crataegus scabrida (N)
- Crataegus schuettei (N)
- Crataegus submollis (N)
- Crataegus suborbiculata (N)
- Crataegus succulenta (N)
- Crataegus tanuphylla (N)
- Crataegus uniflora (N)
- Crepis biennis (I)
- Crepis capillaris (I)
- Crepis nicaeensis (I)
- Crepis pulchra (I)
- Crepis setosa (I)
- Crepis tectorum (I)
- Crotalaria sagittalis (N)
- Croton capitatus var. capitatus (N)
- Croton glandulosus var. septentrionalis (N)
- Croton monanthogynus (N)
- Cruciata pedemontana (I)
- Crypsis schoenoides (I) Zdroj:https://en.wikipedia.org?pojem=Flora_of_Ohio
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