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Pacific sanicle (Sanicula crassicaulis)
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Parry's phacelia (Phacelia parryi)
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Peninsular onion (Allium peninsulare)
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Perennial peppergrass* (Lepidium latifolium)
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Periwinkle* (Vinca major)
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Persian speedwell* (Veronica persica)
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Phlox-leaved bedstraw (Galium andrewsii)
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Pineapple weed* (Chamomilla suaveolens)
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Pink rockrose* (Cistus creticus)
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Pin-point clover (Trifolium gracilentum)
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Plummer's mariposa lily (Calochortus plummerae)
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Poison hemlock* (Conium maculatum)
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Poison oak (Toxicodendron diversilobum)
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Popcorn flower (Cryptantha intermedia)
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Prickly lettuce* (Lactuca serriola)
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Prickly phlox (Leptodactylon californicum)
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Prickly poppy (Argemone munita)
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Prickly sow thistle* (Sonchus asper)
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Purple clarkia (Clarkia purpurea)
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Purple nightshade (Solanum xanti)
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Purple sage (Salvia leucophylla)
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