- Palafoxia arida
- Pectocarya setosa
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- Penstemon eatonii
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- Penstemon palmeri
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- Penstemon sp.
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- Petalonyx thurberi
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- Peucephyllum schottii
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- Phacelia calthifolia
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- Phacelia campanularia
- Phacelia crenulata
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- Phacelia distans
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- Phacelia fremontii
- Phacelia tanacetifolia
- Phacelia valis-mortae
- Pholisma arenarium
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- Phoradendron californicum
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- Physalis crassifolia
- Platystemon californicus
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- Pluchea sericea
- Prosopis glandulosa var. torreyana
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- Prosopis pubescens
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- Prunus andersonii
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- Psathyrotes ramosissima
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- Psorothamnus arborescens var. arborescens
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- Psorothamnus arborescens var. minutifolius
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- Psorothamnus emoryi
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- Psorothamnus fremontii
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- Psorothamnus polydenius
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- Psorothamnus schottii
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- Psorothamnus spinosus
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- Purshia mexicana
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- Purshia tridentata
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- Purshia tridentata var. glandulosa
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