- Pedicularis densiflora
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- Pellaea andromedifolia
- Pentagramma triangularis
- Phacelia californica
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- Phacelia distans
- Pholistoma auritum
- Phoradendron villosum
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- Physocarpus capitatus
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- Picris echioides
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- Plantago lanceolata
- Plantago subnuda
- Platanthera leucostachys
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- Platanus racemosa
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- Picture 3 (fruits)
- Platystemon californicus
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- Plectritis macrocera
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- Picture 3
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- Polygala californica
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- Polygonum amphibium var. emersum
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- Picture 2
- Polypodium glycyrrhiza
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- Picture 3 (sori)
- Polypodium scouleri
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- Polypogon monspeliensis
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- Polystichum munitum
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- Portulaca oleracea
- Potentilla anserina ssp. pacifica
- Potentilla glandulosa
- Prunella vulgaris
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- Prunus emarginata
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- Pseudotsuga menziesii
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- Pseudotsuga menziesii var. menziesii
- Pteridium aquilinum var. pubescens
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- Pterostegia drymarioides
- Pyrola asarifolia
- Pyrola picta
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