- Pacific madrone
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Pacific sanicle
- Palmer's goldenbush
- Palmer's spineflower
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8
- Picture 9
- Parry's phacelia
- Picture 1
- Picture 2
- Pearly everlasting
- Pectocarya
- Peppergrass
- Perennial peppergrass
- Picture 1
- Picture 2
- Perennial ryegrass
- Perezia
- Picture 1
- Picture 2
- Picture 3
- Periwinkle
- Picture 1
- Picture 2
- Petty spurge
- Phacelia
- Picture 1
- Picture 2
- Picture 3
- Pickleweed
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Pig-nut
- Picture 1
- Picture 2
- Picture 3
- Pigweed
- Pineapple weed
- Pink star tulip
- Picture 1
- Picture 2
- Pitcher sage
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8
- Picture 9
- Picture 10
- Plantain
- Picture 1
- Picture 2
- Picture 3
- Plummer's mariposa lily
- Picture 1 (Rare)
- Picture 2 (Rare)
- Picture 3 (Rare)
- Picture 4 (Rare)
- Picture 5 (Rare)
- Picture 6 (Rare)
- Picture 7 (Rare)
- Picture 8 (Rare)
- Picture 9 (Rare)
- Picture 10 (Rare)
- Picture 11 (Rare)
- Picture 12 (Rare)
- Picture 13 (Rare)
- Picture 14 (Rare)
- Picture 15 (Rare)
- Picture 16 (Rare)
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- Poison hemlock
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Poison oak
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Polygala
- Poor man's weather glass
- Picture 1
- Picture 2
- Powdery live-forever
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Prickly lettuce
- Picture 1 (leaf midrib)
- Picture 2
- Picture 3
- Prickly pear
- Prickly phlox
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Prickly skunk flower
- Picture 1
- Picture 2
- Prince's plume
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Prostrate spurge
- Psoralea
- Picture 1
- Picture 2
- Pterostegia
- Puncture weed
- Picture 1
- Picture 2
- Purple clarkia
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Purple needlegrass
- Picture 1
- Picture 2
- Purple nightshade
- Purple sage
- Picture 1
- Picture 2
- Purple sanicle
- Purple star-thistle
- Picture 1
- Picture 2
- Picture 3
- Purslane
- Pygmy-weed
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