- Clematis flammula
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- Clematis recta
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- Clematis vitalba
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- clypeola jonthlaspi
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- Cochlearia aragonensis aragonensis
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- Cochlearia glastifolia
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- Colutea arborescens
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- Conium maculatum
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- Conopodium arvense
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- Conopodium majus majus
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- Consolida orientalis
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- Consolida pubescens
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- Convallaria majalis
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- Convolvulus arvensis
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- Convolvulus cantabrica
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- Coriaria myrtifolia
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- Cornus sanguinea
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- Coronilla glauca
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- Coronilla minima
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- Coronilla scorpioides
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- Corrigiola litoralis telephiifolia
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- Corydalis solida solida
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- Crataegus monogyna
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- Crepis albida
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- Crepis biennis
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- Crepis capillaris
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- Crepis conyzifolia
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- Crepis foetida foetida
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- Crepis lampsanoides
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- Crepis nicaeensis
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