Opuntia fragilis
Brittle cactus
|
Cactaceae
|
Orobanche uniflora
|
Naked broom-rape
|
Orobanchaceae
|
Orthocarpus attenuatus
|
Narrow-leaved owl-clover
|
Scrophulariaceae
|
Orthocarpus castillejoides
|
Paintbrush owl-clover
|
Scrophulariaceae
|
Orthocarpus pusillus
|
Dwarf owl-clover
|
Scrophulariaceae
|
Osmorhiza chilensis
|
Mountain sweet-cicely
|
Apiaceae
|
Pachistima myrsinites
|
Mountain box
|
Celastraceae
|
Papaver argemone*
|
Long prickly-headed poppy
|
Papaveraceae
|
Papaver rhoeas*
|
Corn poppy
|
Papaveraceae
|
Papaver somniferum*
|
Opium poppy
|
Papaveraceae
|
Parentucellia viscosa*
|
Yellow parentucellia
|
Scrophulariaceae
|
Perideridia gairdneri
|
Yampah
|
Apiaceae
|
Petasites frigidus
|
Sweet coltsfoot
|
Asteraceae
|
Phacelia linearis
|
Thread-leaf phacelia
|
Hydrophyllaceae
|
Phalaris arundinacea*
|
Reed canarygrass
|
Poaceae
|
Philadelphus lewisii
|
Mock-orange
|
Hydrangeaceae
|
Phragmites communis
|
Common reed
|
Poaceae
|
Phyllospadix scouleri
|
Surf-grass
|
Zosteraceae
|
Physocarpus capitatus
|
Pacific ninebark
|
Rosaceae
|
Picea sitchensis
|
Sitka spruce
|
Pinaceae
|
Pinus contorta
|
Lodgepole pine
|
Pinaceae
|
Pinus monticola
|
Western white pine
|
Pinaceae
|
Piperia transversa
|
Royal rein orchid
|
Orchidaceae
|
Pityrogramma triangularis
|
Gold-back fern
|
Polypodiaceae
|
Plantago bigelovii*
|
Coast plantain
|
Plantaginaceae
|
Plantago lanceolata*
|
English plantain
|
Plantaginaceae
|
Plantago major*
|
Common plantain
|
Plantaginaceae
|
Plantago maritima
|
Seaside plantain
|
Plantaginaceae
|
Plantago patagonica
|
Candleweed
|
Plantaginaceae
|
Plectritis congesta
|
Sea blush
|
Valerianaceae
|
Poa annua*
|
Annual bluegrass
|
Poaceae
|
Poa bulbosa*
|
Bulbous bluegrass
|
Poaceae
|
Poa compressa
|
Canadian bluegrass
|
Poaceae
|
Poa confinis
|
Coastline bluegrass
|
Poaceae
|
Poa howellii
|
Howell's bluegrass
|
Poaceae
|
Poa macrantha
|
Seashore bluegrass
|
Poaceae
|
Poa palustris*
|
Fowl meadow-grass
|
Poaceae
|
Poa pratensis*
|
Kentucky bluegrass
|
Poaceae
|
Poa trivialis*
|
Roughstalk bluegrass
|
Poaceae
|
Polemonium micranthum
|
Littlebells polemonium
|
Polemoniaceae
|
Polygonum amphibium
|
Water smartweed
|
Polygonaceae
|
Polygonum aviculare*
|
Doorweed
|
Polygonaceae
|
Polygonum convolvulus*
|
Black bindweed
|
Polygonaceae
|
Polygonum douglasii
|
Douglas' knotweed
|
Polygonaceae
|
Polygonum fowleri
|
Fowler's knotweed
|
Polygonaceae
|
Polygonum hydropiper
|
Marshpepper smartweed
|
Polygonaceae
|
Polygonum nuttallii
|
Nuttall's knotweed
|
Polygonaceae
|
Polygonum paronychia
|
Beach knotweed
|
Polygonaceae
|
Polygonum persicaria*
|
Heartweed
|
Polygonaceae
|
Polygonum punctatum
|
Water smartweed
|
Polygonaceae
|
Polygonum spergulariaeforme
|
Spurry knotweed
|
Polygonaceae
|
Polypodium glycyrrhiza
|
Licorice fern
|
Polypodiaceae
|
Polypodium hesperium
|
Western polypody
|
Polypodiaceae
|
Polypogon monspeilensis*
|
Rabbitsfoot grass
|
Poaceae
|
Polystichum munitum
|
Sword fern
|
Polypodiaceae
|
Populus tremuloides
|
Quaking aspen
|
Salicaceae
|
Populus trichocarpa
|
Black cottonwood
|
Salicaceae
|
Potamogeton amplifolius
|
Large-flowered pondweed
|
Potamogetonaceae
|
Potamogeton foliosus
|
Closed-leaved pondweed
|
Potamogetonaceae
|
Potamogeton gramineus
|
Grass-leaved pondweed
|
Potamogetonaceae
|
Potamogeton illinoensis
|
Illinois pondweed
|
Potamogetonaceae
|
Potamogeton natans
|
Floating-leaf pondweed
|
Potamogetonaceae
|
Potamogeton pectinatus
|
Fennel-leaf pondweed
|
Potamogetonaceae
|
Potamogeton praelongus
|
White-stalked pondweed
|
Potamogetonaceae
|
Potamogeton richardsonii
|
Richardson's pondweed
|
Potamogetonaceae
|
Potamogeton zosteriformis
|
Eel-grass pondweed
|
Potamogetonaceae
|
Potentilla anserina
|
Common silverweed
|
Rosaceae
|
Potentilla gracilis
|
Graceful cinquefoil
|
Rosaceae
|
Potentilla pacifica
|
Pacific silverweed
|
Rosaceae
|
Potentilla palustris
|
Marsh cinquefoil
|
Rosaceae
|
Prunella vulgaris
|
Self-heal
|
Lamiaceae
|
Prunus emarginata
|
Bitter cherry
|
Rosaceae
|
Prunus virginiana
|
Chokecherry
|
Rosaceae
|
Pseudotsuga menziesii
|
Douglas fir
|
Pinaceae
|
Psoralea physodes
|
California-tea
|
Fabaceae
|
Pteridium aquilinum
|
Bracken
|
Polypodiaceae
|
Pterospora andromedea
|
Pinedrops
|
Ericaceae
|
Puccinellia nuttalliana
|
Nuttall's alkaligrass
|
Poaceae
|
Puccinellia pauciflora
|
Weak alkaligrass
|
Poaceae
|
Pyrola asarifolia
|
Pink wintergreen
|
Ericaceae
|
Pyrola chlorantha
|
Green wintergreen
|
Ericaceae
|
Pyrus fusca
|
Pacific crabapple
|
Rosaceae
|
Pyrus malus*
|
Apple
|
Rosaceae
|
Quercus garryana
|
Oregon white oak
|
Fagaceae
|
Ranunculus aquatilis
|
Water buttercup
|
Ranunculaceae
|
Ranunculus cymbalaria
|
Shore buttercup
|
Ranunculaceae
|
Ranunculus flammula
|
Lesser spearwort
|
Ranunculaceae
|
Ranunculus occidentalis
|
Western buttercup
|
Ranunculaceae
|
Ranunculus orthorhynchus
|
Straight-beak buttercup
|
Ranunculaceae
|
Ranunculus repens*
|
Creeping buttercup
|
Ranunculaceae
|
Ranunculus sceleratus
|
Celery-leaved buttercup
|
Ranunculaceae
|
Ranunculus uncinatus
|
Little buttercup
|
Ranunculaceae
|
Raphanus raphanistrum*
|
Jointed sharlock
|
Brassicaceae
|
Raphanus sativus*
|
Wild radish
|
Brassicaceae
|
Rhamnus purshiana
|
Cascara
|
Rhamnaceae
|
Rhinanthus cristi-galli
|
Rattle-box
|
Scrophulariaceae
|
Rhododendron macrophyllum
|
Western rhododendron
|
Ericaceae
|
Ribes bracteosum
|
Stink currant
|
Grossulariaceae
|
Ribes divaricatum
|
Coast black gooseberry
|
Grossulariaceae
|
Ribes lacustre
|
Prickly currant
|
Grossulariaceae
|
Ribes sanguineum
|
Red-flowered currant
|
Grossulariaceae
|
Rorippa islandica
|
Marsh yellowcress
|
Brassicaceae
|
Rosa canina*
|
Dog rose
|
Rosaceae
|
Rosa eglanteria*
|
Sweetbrier
|
Rosaceae
|
Rosa gymnocarpa
|
Baldhip rose
|
Rosaceae
|
Rosa nutkana
|
Nootka rose
|
Rosaceae
|
Rosa pisocarpa
|
Clustered wild rose
|
Rosaceae
|
Rosa rugosa*
|
Japanese beach rose
|
Rosaceae
|
Rubus discolor*
|
Himalayan blackberry
|
Rosaceae
|
Rubus idaeus
|
Red raspberry
|
Rosaceae
|
Rubus laciniatus*
|
Evergreen blackberry
|
Rosaceae
|
Rubus lasiococcus
|
Dwarf bramble
|
Rosaceae
|
Rubus leucodermis
|
Blackcap
|
Rosaceae
|
Rubus parviflorus
|
Thimbleberry
|
Rosaceae
|
Rubus spectabilis
|
Salmonberry
|
Rosaceae
|
Rubus ursinus
|
Wild blackberry
|
Rosaceae
|
Rudbeckia hirta*
|
Black-eyed Susan
|
Rosaceae
|
Rumex acetosella*
|
Sheep sorrel
|
Polygonaceae
|
Rumex conglomeratus*
|
Clustered dock
|
Polygonaceae
|
Rumex crispus*
|
Sour dock
|
Polygonaceae
|
Rumex occidentalis
|
Western dock
|
Polygonaceae
|
Rumex salicifolius
|
Willow dock
|
Polygonaceae
|
Ruppia maritima
|
Ditchgrass
|
Ruppiaceae
|
Sagina apetala*
|
Common pearlwort
|
Caryophyllaceae
|
Sagina crassicaulis
|
Stickystem pearlwort
|
Caryophyllaceae
|
Sagina occidentalis
|
Western pearlwort
|
Caryophyllaceae
|
Sagina procumbens*
|
Arctic pearlwort
|
Caryophyllaceae
|
Salicornia virginica
|
Pickleweed
|
Chenopodiaceae
|
Salix hookeriana
|
Hooker's willow
|
Salicaceae
|
Salix lasiandra
|
Pacific willow
|
Salicaceae
|
Salix scouleriana
|
Scouler willow
|
Salicaceae
|
Salix sitchensis
|
Sitka willow
|
Salicaceae
|
Sambucus racemosa
|
Red elderberry
|
Caprifoliaceae
|
Sanicula bipinnatifida
|
Purple sanicle
|
Apiaceae
|
|
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