Epithets
| plenum | double |
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| plumbea | colored like lead |
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| plumbeus | colored like lead |
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| plumeus | downy, feathery |
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| plumosus | downy, feathery |
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| pluri- | prefix meaning "more" |
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| podo- | prefix meaning "foot, footed" |
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| poly- | prefix meaning "many" |
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| porphyrea | dark purplish-red |
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| porphyria | dark purplish-red |
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| porphyrius | dark purplish-red |
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| praecocis | early-ripening |
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| praecox | early-ripening |
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| pratense | in meadows |
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| pratensis | in meadows |
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| princeps | distinguished |
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| principe | distinguished |
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| procumbens | prostrate |
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| procurrens | spreading |
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| ptarmica | causes sneezing |
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| ptarmicus | causes sneezing |
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| pube- | prefixes meaning "hair, hairy" |
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| pubi- | prefixes meaning "hair, hairy" |
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| pulcher | pretty, beautiful |
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| pulchra | pretty, beautiful |