Epithets
| capnodes | smoke colored |
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| capnoides | smoke colored |
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| cardinalis | red |
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| cardio- | prefix meaning "heart" |
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| carneolus | flesh-colored |
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| carneus | flesh-colored |
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| caryophyllaceus | pinkish |
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| caryophyllus | pinkish |
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| castanea | chestnut-colored |
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| castaneum | chestnut-colored |
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| castaneus | chestnut-colored |
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| catenatum | chained |
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| catenatus | chained |
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| cathartica | purgative |
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| catharticum | purgative |
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| caudata | with a tail |
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| caudatum | with a tail |
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| caulescens | not with a full stem |
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| caulialata | with a winged stem |
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| caulialatus | with a winged stem |
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| cauticola | growing on cliffs |
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| cauticolus | growing on cliffs |
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| cavum | concave |
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| cavus | concave |
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| cephalanthus | flowering head |