Rocky Mountain Groundsel
Packera streptanthifolia var. streptanthifolia
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Buek's Groundsel
Packera subnuda
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Cleftleaf Groundsel
Packera subnuda var. subnuda
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Desert Palafox
Palafoxia arida
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Western Panicgrass
Panicum acuminatum
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Panicum acuminatum var. lindheimeri
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Witch Grass
Panicum capillare
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Pennsylvania Pellitory
Parietaria pensylvanica
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San Bernardino Grass Of Parnassus
Parnassia cirrata
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Fringed Grass
Parnassia fimbriata
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California Grass Of Parnassus
Parnassia palustris
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Knotgrass
Paspalum distichum
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Brewer's Mitrewort
Pectiantia breweri
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Coastal Miterwort
Pectiantia ovalis
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Five Stamened Miterwort
Pectiantia pentandra
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Little Elephant's Head
Pedicularis attollens
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Elephant Heads
Pedicularis groenlandica
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Small Flowered Penstemon
Penstemon procerus
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Western Small Flowered Penstemon
Penstemon procerus var. formosus
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Rydberg's Penstemon
Penstemon rydbergii
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Mountain Meadow Beardtongue
Penstemon rydbergii var. oreocharis
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California Yampah
Perideridia californica
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Gairdner's Yampah
Perideridia gairdneri
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Perideridia gairdneri ssp. borealis
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Howell's Yampah
Perideridia howellii
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Parish's Yampah
Perideridia parishii
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Perideridia parishii ssp. latifolia
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Swamp Knotweed
Persicaria amphibia
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Water Pepper
Persicaria hydropiperoides
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Willow Weed
Persicaria lapathifolia
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Water Smartweed
Persicaria punctata
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Arctic Sweet Coltsfoot
Petasites frigidus var. palmatus
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Seaside Petunia
Petunia parviflora
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Tall Phacelia
Phacelia procera
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Bolander's Mock Dandelion
Phalacroseris bolanderi
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Timothy Canary Grass
Phalaris angusta
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Reed Canarygrass
Phalaris arundinacea
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California Canarygrass
Phalaris californica
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Lemmon's Canary Grass
Phalaris lemmonii
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Alpine Timothy
Phleum alpinum
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Common Reed
Phragmites australis
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Lanceleaf Fogfruit
Phyla lanceolata
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Scouler's Surfgrass
Phyllospadix scouleri
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Torrey's Surfgrass
Phyllospadix torreyi
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Pacific Ninebark
Physocarpus capitatus
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Siskiyou Beauty Ninebark
Physocarpus capitatus 'Siskiyou Beauty'
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Tilden Park Ninebark
Physocarpus capitatus 'Tilden Park'
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Engelmann Spruce
Picea engelmannii
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Sitka Spruce
Picea sitchensis
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American Pillwort
Pilularia americana
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Lodgepole Pine
Pinus contorta
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Shore Pine
Pinus contorta ssp. contorta
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Tamarack Pine
Pinus contorta ssp. murrayana
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Alaska Piperia
Piperia unalascensis
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Adobe Popcornflower
Plagiobothrys acanthocarpus
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Bracted Popcornflower
Plagiobothrys bracteatus
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Artist's Popcornflower
Plagiobothrys chorisianus
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Madera Popcornflower
Plagiobothrys distantiflorus
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Sculptured Popcornflower
Plagiobothrys glyptocarpus
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Plagiobothrys glyptocarpus var. glyptocarpus