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)
- Cryptotaenia canadensis (N)
- Cucumis melo (I)
- Cucumis sativus (I)
- Cucurbita foetidissima (N)
- Cucurbita maxima (I)
- Cucurbita pepo (N)
- Cucurbita pepo var. pepo (I)
- Cunila origanoides (N)
- Cuphea viscosissima (N)
- Cuscuta cephalanthi (N)
- Cuscuta compacta var. compacta (N)
- Cuscuta coryli (N)
- Cuscuta epilinum (I)
- Cuscuta epithymum (I)
- Cuscuta glomerata (N)
- Cuscuta gronovii var. gronovii (N)
- Cuscuta pentagona var. pentagona (N)
- Cuscuta polygonorum (N)
- Cuscuta suaveolens (I)
- Cyclachaena xanthifolia (N)
- Cycloloma atriplicifolium (N)
- Cydonia oblonga (I)
- Cymbalaria muralis (I)
- Cynanchum laeve (N)
- Cynanchum louiseae (I)
- Cynodon dactylon (I)
- Cynoglossum officinale (I)
- Cynoglossum virginianum var. boreale (N)
- Cynoglossum virginianum var. virginianum (N)
- Cynosurus cristatus (I)
- Cynosurus echinatus (I)
- Cyperus acuminatus (N)
- Cyperus amuricus (I)
- Cyperus bipartitus (N)
- Cyperus compressus (N)
- Cyperus diandrus (N)
- Cyperus echinatus (N)
- Cyperus erythrorhizos (N)
- Cyperus esculentus (N)
- Cyperus esculentus var. leptostachyus (I)
- Cyperus flavescens (N)
- Cyperus houghtonii (N)
- Cyperus iria (I)
- Cyperus lancastriensis (N)
- Cyperus lupulinus ssp. lupulinus (N)
- Cyperus lupulinus ssp. macilentus (N)
- Cyperus odoratus (N)
- Cyperus refractus (N)
- Cyperus retrofractus (N)
- Cyperus schweinitzii (N)
- Cyperus squarrosus (N)
- Cyperus strigosus (N)
- Cypripedium acaule (N)
- Cypripedium × andrewsii var. andrewsii (N)
- Cypripedium × andrewsii var. landonii (N)
- Cypripedium candidum (N)
- Cypripedium parviflorum var. parviflorum (N)
- Cypripedium parviflorum var. pubescens (N)
- Cypripedium reginae (N)
- Cyrtomium falcatum (I)
- Cystopteris bulbifera (N)
- Cystopteris fragilis (N)
- Cystopteris × illinoensis (N)
- Cystopteris protrusa (N)
- Cystopteris tennesseensis (N)
- Cystopteris tenuis (N)
- Cystopteris × wagneri (N)
- Cytisus scoparius var. scoparius (I)
Read more about this topic: Flora Of Ohio