- Pacific gum plant
- Picture 1
- Picture 2
- Pacific madrone
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Pacific ninebark
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Pearly everlasting
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Peppergrass
- Perennial ryegrass
- Perennial sweet pea
- Petty spurge
- Pickleweed
- Picture 1
- Picture 2
- Picture 3
- Pigweed
- Picture 1
- Picture 2
- Pineapple weed
- Picture 1
- Picture 2
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- Pink pyrola
- Pink star tulip
- Picture 1
- Picture 2
- Pitcher sage
- Picture 1
- Picture 2
- Poison hemlock
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Poison oak
- Picture 1
- Picture 2
- Picture 3
- Powdery live-forever
- Picture 1
- Picture 2
- Picture 3
- Prickly lettuce
- Pterostegia
- Puncture weed
- Picture 1
- Picture 2
- Purple clarkia
- Purple fairy lantern
- Purple nightshade
- Purple sanicle
- Purple star-thistle
- Purslane
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