Epithets
| caelestis | sky blue |
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| caerulea | blue |
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| caeruleus | blue |
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| caesium | bluish gray |
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| caesius | bluish gray |
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| caespitosum | tufted |
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| caespitosus | tufted |
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| calamus | reed |
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| calcareus | chalky, limey, of limestone |
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| calceolata | slipper-shaped |
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| calceolatus | slipper-shaped |
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| calceolus | small shoe |
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| calcicola | limestone loving |
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| calciphilus | limestone loving |
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| calendula | long lived |