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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