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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Soft Popcornflower
Plagiobothrys mollis
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Downy Popcorn Flower
Plagiobothrys mollis var. mollis
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Rusty Popcornflower
Plagiobothrys nothofulvus
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Netted Popcornflower
Plagiobothrys reticulatus
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Plagiobothrys reticulatus var. reticulatus
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Fort Ross Popcornflower
Plagiobothrys reticulatus var. rossianorum
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Stalked Popcornflower
Plagiobothrys stipitatus
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Stalked Popcornflower
Plagiobothrys stipitatus var. micranthus
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Showy Great Valley Popcornflower
Plagiobothrys stipitatus var. stipitatus
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Pacific Popcornflower
Plagiobothrys tenellus
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Slender Popcornflower
Plagiobothrys tener
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Serpentine Popcornflower
Plagiobothrys tener var. subglaber
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Plagiobothrys tener var. tener
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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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Coast Plantain
Plantago elongata
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Redwool Plantain
Plantago eriopoda
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Goose Tongue
Plantago maritima
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Naked Plantain
Plantago subnuda
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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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Intermountain Bog Orchid
Platanthera tescamnis
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Arizona Sycamore
Platanus wrightii
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Annual Semaphoregrass
Pleuropogon californicus
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North Coast Semaphoregrass
Pleuropogon hooverianus
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Marsh Fleabane
Pluchea odorata
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Arrow Weed
Pluchea sericea
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Marsh Bluegrass
Poa leptocoma
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Bog Blue Grass
Poa leptocoma ssp. leptocoma
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Douglas' Pogogyne
Pogogyne douglasii
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Douglas' Mesamint
Pogogyne douglasii ssp. parviflora
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Thymeleaf Beardstyle
Pogogyne serpylloides
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Western Sky Pilot
Polemonium occidentale
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Desert Combleaf
Polyctenium fremontii
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Broadleaf Knotweed
Polygonum minimum
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Parry's
Polygonum parryi
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Fruitleaf Knotweed
Polygonum polygaloides ssp. confertiflorum
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Kellogg's Knotweed
Polygonum polygaloides ssp. kelloggii
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Narrow Leaved Cottonwood
Populus angustifolia
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Fremont Cottonwood
Populus fremontii ssp. fremontii
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Quaking Aspen
Populus tremuloides
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Black Cottonwood
Populus trichocarpa
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Fleshy Porterella
Porterella carnosula
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Alpine Pondweed
Potamogeton alpinus
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Broad-leaved Pondweed
Potamogeton amplifolius
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Small Pondweed
Potamogeton berchtoldii
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Diverse-leaved Pondweed
Potamogeton diversifolius
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Leafy Pondweed
Potamogeton foliosus
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Leafy Pondweed
Potamogeton foliosus ssp. foliosus
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Grass-leaved Pondweed
Potamogeton gramineus
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Shining Pondweed
Potamogeton illinoensis
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Floating Leaved Pondweed
Potamogeton natans
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Long-leaved Pondweed
Potamogeton nodosus
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Small Pondweed
Potamogeton pusillus
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Richardson's Pondweed
Potamogeton richardsonii
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Silverweed
Potentilla anserina