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- Cannabis
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- Cardamine pratensis
- Carduus
- Carduus acanthoides
- Carduus acanthoides subsp. acanthoides
- Carduus crispus
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- Carduus pycnocephalus subsp. pycnocephalus
- Carex
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- Carex canescens subsp. canescens
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- Carex sect. Carex
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- Carica
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- Carlina vulgaris
- Carlina vulgaris subsp. vulgaris
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- Ceanothus
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- Centaurea cyanus
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- Cerastium
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- Cerastium alpinum subsp. alpinum
- Cerastium arvense
- Cerastium arvense subsp. arvense
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- Ceratophyllum
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- Chelidonium
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- Chelone obliqua var. obliqua
- Chenopodium
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- Chenopodium glaucum
- Chenopodium glaucum var. glaucum
- Chenopodium murale
- Chenopodium polyspermum