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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