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Canna glauca, Canna indica, Cannabis, Cannabis sativa, Capraria, Capraria biflora, Cardamine, Cardamine bellidifolia, Cardamine hirsuta, Cardamine impatiens, Cardamine parviflora, Cardamine pratensis, Carduus, Carduus acanthoides, Carduus acanthoides subsp. acanthoides, Carduus crispus, Carduus nutans, Carduus pycnocephalus, Carduus pycnocephalus subsp. pycnocephalus, Carex, Carex arenaria, Carex atrata, Carex canescens, Carex canescens subsp. canescens, Carex capillaris, Carex capitata, Carex distans, Carex flava, Carex folliculata, Carex hirta, Carex limosa, Carex loliacea, Carex muricata, Carex pallescens, Carex panicea, Carex pseudocyperus, Carex saxatilis, Carex sect. Carex, Carex squarrosa, Carex vesicaria, Carica, Carica papaya, Carlina, Carlina vulgaris, Carlina vulgaris subsp. vulgaris, Carpinus, Carthamus, Carthamus creticus, Carthamus lanatus, Carthamus tinctorius, Caryota, Caryota urens, Cassytha filiformis, Casuarina, Casuarina equisetifolia, Casuarina equisetifolia subsp. equisetifolia, Ceanothus, Ceanothus americanus, Ceanothus subg. Ceanothus, Celastrus, Celastrus scandens, Celosia, Celosia argentea, Celosia cristata, Celosia trigyna, Celtis, Celtis occidentalis, Centaurea, Centaurea calcitrapa, Centaurea cyanus, Centaurea jacea, Centaurea melitensis, Centaurea montana, Centaurea nigra, Centaurea phrygia, Centaurea scabiosa, Centaurea solstitialis, Centaurea stoebe, Cerastium, Cerastium alpinum, Cerastium alpinum subsp. alpinum, Cerastium arvense, Cerastium arvense subsp. arvense, Cerastium dichotomum, Cerastium maximum, Cerastium semidecandrum, Cerastium tomentosum, Ceratophyllum, Ceratophyllum demersum, Chelidonium, Chelidonium majus, Chelone, Chelone glabra, Chelone obliqua, Chelone obliqua var. obliqua, Chenopodium, Chenopodium album, Chenopodium bonus-henricus, Chenopodium glaucum, Chenopodium glaucum var. glaucum, Chenopodium murale, Chenopodium polyspermum, Chenopodium polyspermum var. polyspermum, Chenopodium rubrum, Chenopodium rubrum var. rubrum, Chenopodium sect. Chenopodium, Chenopodium subg. Chenopodium, Chenopodium subsect. Chenopodium, Chenopodium urbicum, Chenopodium vulvaria, Chondrilla, Chondrilla juncea, Chrysobalanus, Chrysobalanus icaco, Chrysobalanus icaco subsp. icaco, Chrysogonum, Chrysogonum virginianum, Chrysogonum virginianum var. virginianum, Chrysophyllum, Chrysophyllum oliviforme, Chrysophyllum oliviforme subsp. oliviforme, Chrysosplenium, Cichorium, Cichorium intybus, Circaea, Circaea alpina, Circaea alpina subsp. alpina, Cissampelos, Cissampelos pareira, Cissus, Cistus, Cistus incanus, Cistus ladanifer, Cistus monspeliensis, Cistus salviifolius, Claytonia, Claytonia sibirica, Claytonia virginica, Clematis, Clematis crispa, Clematis orientalis, Clematis recta, Clematis subg. Clematis, Clematis viorna, Clematis virginiana, Clematis vitalba, Clematis viticella, Cleome, Cleome ornithopodioides, Clethra, Clethra alnifolia, Clusia, Cochlearia, Cochlearia groenlandica, Cocos, Cocos nucifera, Comarum, Comarum palustre, Commelina benghalensis, Commelina communis, Commelina erecta, Commelina virginica, Conocarpus, Conocarpus erectus, Convallaria, Convallaria majalis, Convallaria majalis var. majalis, Corchorus, Corchorus aestuans, Corchorus hirsutus, Corchorus hirtus, Corchorus siliquosus, Corchorus tridens, Coreopsis, Coreopsis auriculata, Coreopsis lanceolata, Coreopsis sect. Coreopsis, Coreopsis tripteris, Coreopsis verticillata, Corispermum, Corispermum hyssopifolium, Cornus, Cornus canadensis, Cornus florida, Cornus mas, Cornus sanguinea, Cornus sericea, Cornus subg. Cornus, Cornus suecica, Corrigiola, Corrigiola litoralis, Corrigiola litoralis subsp. litoralis, Corylus, Corylus avellana, Cotula, Cotula coronopifolia, Cotyledon, Cotyledon orbiculata, Crambe, Crambe maritima, Crassula, Crassula tetragona, Crataegus, Crataegus (sect. Crataegus) ser. Apiifoliae, Crataegus (sect. Crataegus) ser. Cordatae, Crataegus (sect. Crataegus) ser. Crataegus, Crataegus (sect. Crataegus) ser. Microcarpae, Crataegus coccinea, Crataegus coccinea var. coccinea, Crataegus crus-galli, Crataegus crus-galli var. crus-galli, Crataegus crus-galli var. pyracanthifolia, Crataegus sect. Crataegus, Crataegus viridis, Crataegus viridis var. viridis, Crepis, Crepis biennis, Crepis bursifolia, Crepis foetida, Crepis pulchra, Crepis rubra, Crepis tectorum, Crepis vesicaria, Crinum, Crinum americanum, Crinum americanum var. americanum, Crinum asiaticum, Croton, Croton argenteus, Croton glandulosus, Croton humilis, Cucumis, Cucumis anguria, Cucumis melo, Cucumis sativus, Cucurbita, Cucurbita melopepo, Cucurbita pepo, Cupressus, Curcuma, Cynara, Cynara cardunculus, Cynara cardunculus subsp. cardunculus, Cyperus, Cyperus articulatus, Cyperus compressus, Cyperus difformis, Cyperus elegans, Cyperus esculentus, Cyperus flavescens