- Paeonia californica
- Papaver californicum
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Paspalum dilatatum
- Pectocarya linearis ssp. ferocula
- Pedicularis densiflora
- Picture 1
- Picture 2
- Picture 3
- Pellaea andromedifolia
- Pennisetum setaceum
- Penstemon centranthifolius
- Picture 1
- Picture 2
- Penstemon heterophyllus
- Penstemon spectabilis
- Pentachaeta lyonii
- Picture 1 (Rare)
- Picture 2 (Rare)
- Picture 3 (Rare)
- Pentagramma triangularis
- Picture 1
- Picture 2
- Phacelia brachyloba
- Picture 1
- Picture 2
- Phacelia californica
- Picture 1
- Picture 2
- Phacelia cicutaria
- Phacelia cicutaria var. hispida
- Picture 1
- Picture 2
- Picture 3
- Phacelia distans
- Phacelia grandiflora
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Phacelia imbricata
- Picture 1
- Picture 2
- Picture 3
- Phacelia parryi
- Picture 1
- Picture 2
- Phacelia ramosissima
- Picture 1
- Picture 2
- Phacelia ramosissima var. austrolitoralis
- Picture 1
- Picture 2
- Phacelia tanacetifolia
- Picture 1
- Picture 2
- Picture 3
- Phacelia viscida
- Picture 1
- Picture 2
- Phalaris canariensis
- Pholistoma auritum
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Pholistoma membranaceum
- Phoradendron macrophyllum
- Picture 1
- Picture 2 (on sycamore)
- Picture 3 (on sycamore)
- Phoradendron villosum
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Phyla nodiflora var. rosea
- Picture 1
- Picture 2
- Picris echioides
- Picture 1
- Picture 2
- Picture 3
- Picture 4
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- Pinus torreyana
- Pinus torreyana Rare
- Picture 1
- Picture 2
- Picture 3
- Piperia unalascensis
- Pisum sativum
- Picture 1
- Picture 2
- Picture 3
- Plantago coronopsis
- Picture 1
- Picture 2
- Picture 3
- Plantago lanceolata
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Plantago major
- Platanus racemosa
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5 (bark)
- Platystemon californicus
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Plectritis ciliosa
- Picture 1
- Picture 2
- Plectritis macrocera
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Pluchea sericea
- Poa annua
- Poa bolanderi
- Poa compressus
- Poa secunda
- Polygala californica
- Polygala cornuta var. fishiae
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8
- Polygonum amphibium var. emersum
- Picture 1
- Picture 2
- Polygonum arenastrum
- Polypogon monspeliensis
- Picture 1
- Picture 2
- Picture 3
- Polystichum munitum
- Populus balsamifera ssp. trichocarpa
- Picture 1
- Picture 2
- Populus fremontii
- Portulaca oleracea
- Potentilla anserina ssp. pacifica
- Potentilla glandulosa
- Prunus ilicifolia
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Psilocarphus brevissimus var. brevissimus
- Pterostegia drymarioides
- Puccinellia nutkaensis
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