Mixed-nut Pectocarya
Pectocarya heterocarpa
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Sagebrush Combseed
Pectocarya linearis
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Narrow-toothed Pectocarya
Pectocarya linearis ssp. ferocula
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Northern Pectocarya
Pectocarya penicillata
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Round-nut Pectocarya
Pectocarya setosa
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Coffee Fern
Pellaea andromedifolia
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Birdfoot Cliffbrake
Pellaea mucronata
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Tiny Pygmydaisy
Pentachaeta alsinoides
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Golden-rayed Pentachaeta
Pentachaeta aurea
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Meager Pygmydaisy
Pentachaeta exilis
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Meager Pygmydaisy
Pentachaeta exilis ssp. exilis
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Goldenback Fern
Pentagramma triangularis
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Kellogg's Yampah
Perideridia kelloggii
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Swamp Knotweed
Persicaria amphibia
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Caterpillar Phacelia
Phacelia cicutaria
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Great Valley Phacelia
Phacelia ciliata
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Great Valley Phacelia
Phacelia ciliata var. ciliata
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Merced Phacelia
Phacelia ciliata var. opaca
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Wild Heliotrope
Phacelia distans
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Divaricate Phacelia
Phacelia divaricata
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Douglas' Phacelia
Phacelia douglasii
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Douglas' Phacelia
Phacelia douglasii var. douglasii
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Fremont's Phacelia
Phacelia fremontii
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Lacy Phacelia
Phacelia tanacetifolia
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Death Valley Phacelia
Phacelia vallis-mortae
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Reed Canarygrass
Phalaris arundinacea
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Lemmon's Canary Grass
Phalaris lemmonii
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Common Reed
Phragmites australis
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Lanceleaf Fogfruit
Phyla lanceolata
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American Pillwort
Pilularia americana
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Alaska Piperia
Piperia unalascensis
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Adobe Popcornflower
Plagiobothrys acanthocarpus
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Austin's Spiny-nut Popcornflower
Plagiobothrys austiniae
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Bracted Popcornflower
Plagiobothrys bracteatus
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Valley Popcornflower
Plagiobothrys canescens
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California Popcornflower
Plagiobothrys collinus var. californicus
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Madera Popcornflower
Plagiobothrys distantiflorus
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Field Popcornflower
Plagiobothrys fulvus
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Field Popcornflower
Plagiobothrys fulvus var. campestris
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Sculptured Popcornflower
Plagiobothrys glyptocarpus
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Greene's Spiny-nut Popcornflower
Plagiobothrys greenei
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Low Popcornflower
Plagiobothrys humistratus
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Alkali Plagiobothrys
Plagiobothrys leptocladus
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Rusty Popcornflower
Plagiobothrys nothofulvus
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Scridgee's Popcornflower
Plagiobothrys scriptus
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Stalked Popcornflower
Plagiobothrys stipitatus
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Rough-nutlet Popcornflower
Plagiobothrys trachycarpus
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Wavy-stemmed Popcornflower
Plagiobothrys undulatus
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Planodes virginica
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Naked Plantain
Plantago subnuda
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White Bog Orchid
Platanthera dilatata var. leucostachys
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Western Sycamore
Platanus racemosa
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Creamcups
Platystemon californicus
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Longspur Seablush
Plectritis ciliosa
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One-sided Bluegrass
Poa secunda ssp. secunda
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Douglas' Pogogyne
Pogogyne douglasii
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Douglas' Mesamint
Pogogyne douglasii ssp. parviflora
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Sacramento Beardstyle
Pogogyne zizyphoroides
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Royal Sky Pilot
Polemonium carneum
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Spurry Knotweed
Polygonum spergulariiforme