Rough-nutlet Popcornflower
Plagiobothrys trachycarpus
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Hooked Popcornflower
Plagiobothrys uncinatus
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Wavy-stemmed Popcornflower
Plagiobothrys undulatus
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Forget-me-not Popcornflower
Plagiobothrys verrucosus
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Planodes virginica
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Coast Plantain
Plantago elongata
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Dotseed Plantain
Plantago erecta
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Redwool Plantain
Plantago eriopoda
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Goose Tongue
Plantago maritima
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Woolly Plantain
Plantago ovata
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Plantago ovata var. fastigiata
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Plantago ovata var. insularis
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Woolly Plantain
Plantago patagonica
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Redseed Plantain
Plantago rhodosperma
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Naked Plantain
Plantago subnuda
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Scentbottle
Platanthera dilatata
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White Bog Orchid
Platanthera dilatata var. leucostachys
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Sparse-flowered Bog-orchid
Platanthera sparsiflora
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Slender Bog-orchid
Platanthera stricta
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Intermountain Bog Orchid
Platanthera tescamnis
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Yosemite Bog-orchid
Platanthera yosemitensis
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Western Sycamore
Platanus racemosa
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Arizona Sycamore
Platanus wrightii
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Creamcups
Platystemon californicus
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Longspur Seablush
Plectritis ciliosa
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Shortspur Seablush
Plectritis congesta
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Small-flowered Plectritis
Plectritis congesta ssp. brachystemon
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Sea Blush
Plectritis congesta ssp. congesta
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Longhorn Seablush
Plectritis macrocera
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Thorny Skeletonweed
Pleiacanthus spinosus
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Fringed Pinesap
Pleuricospora fimbriolata
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Bush Arrowleaf
Pleurocoronis pluriseta
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Annual Semaphoregrass
Pleuropogon californicus
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Pleuropogon californicus var. californicus
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Davy's Semaphore Grass
Pleuropogon californicus var. davyi
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North Coast Semaphoregrass
Pleuropogon hooverianus
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Nodding Semaphore Grass
Pleuropogon refractus
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Marsh Fleabane
Pluchea odorata
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Saltmarsh-fleabane
Pluchea odorata var. odorata
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Arrow Weed
Pluchea sericea
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Short Bluegrass
Poa abbreviata
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Marsh's Blue Grass
Poa abbreviata ssp. marshii
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Patterson's Blue Grass
Poa abbreviata ssp. pattersonii
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San Bernardino Bluegrass
Poa atropurpurea
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Bigelow's Bluegrass
Poa bigelovii
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Bolander's Bluegrass
Poa bolanderi
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Beach Blue Grass
Poa confinis
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Cusick's Bluegrass
Poa cusickii
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Cusick's Bluegrass
Poa cusickii ssp. cusickii
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Skyline Blue Grass
Poa cusickii ssp. epilis
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Cusick's Bluegrass
Poa cusickii ssp. pallida
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Cusick's Bluegrass
Poa cusickii ssp. purpurascens
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Diablo Canyon Blue Grass
Poa diaboli
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Sand Dune Blue Grass
Poa douglasii
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Muttongrass
Poa fendleriana
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Mutton Grass
Poa fendleriana ssp. fendleriana
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Long-tongue Mutton Grass
Poa fendleriana ssp. longiligula
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Glaucous Bluegrass
Poa glauca
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Timberline Blue Grass
Poa glauca ssp. rupicola
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Howell's Bluegrass
Poa howellii