Vascular Plants
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Common names beginning with P:
Pacific (Rubus ursinus)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia south to California, east to Idaho.
Habitat: Open to fairly dense woodlands, sea level to mid-elevations in the mountains; common in logged areas.
Origin: Native
Attenuate paintbrush (Castilleja attenuata)
Distribution: Chiefly west of the Cascades in Washington; British Columbia south to California and Arizona.
Habitat: Drier areas at low elevations.
Origin: Native
Chambers's Indian paintbrush (Castilleja chambersii)
Distribution: Known only from Pacific County in Washington; Pacific County, WA south to Clatsop County, OR.
Habitat: Forest openings, embankments, and rock outcroppings typically where moist.
Origin: Native
Cliff paintbrush (Castilleja rupicola)
Distribution: Chiefly west of the Cascades in Washington; from southern British Columbia to central Oregon.
Habitat: Rock crevices and rocky slopes, usually above timberline.
Origin: Native
Cusick's paintbrush (Castilleja cusickii)
Distribution: East of the Cascades in Washington; Alberta south to Montana and Wyoming, west through Idaho to northeast Oregon.
Habitat: Open areas, lower valleys to subalpine meadows.
Origin: Native
Deer paintbrush (Castilleja cervina)
Distribution: Northeast Washington; British Columbia east to northern Idaho and Montana.
Habitat: Grasslands and woodlands at moderate to mid-elevations
Origin: Native
Devil's paintbrush (Hieracium aurantiacum)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east across southern Canada and northern U.S; widely distributed throughout eastern U.S.
Habitat: Moist sites from lowlands to mid-elevations in the mountains, typically where disturbed.
Origin: Introduced from Europe
Elmer's paintbrush (Castilleja elmeri)
Distribution: Wenatchee Mountains and the east slope of the Cascades, Kittitas County, Washington; north into British Columbia.
Habitat: Moist, open slopes at mid-elevations in the mountains.
Origin: Native
Golden paintbrush (Castilleja levisecta)
Distribution: Puget Sound of Washington; Vancouver Island south to the Willamette Valley of Oregon.
Habitat: Meadows and prairies at low elevations.
Origin: Native
Obscure paintbrush (Castilleja cryptantha)
Distribution: Endemic to Mt. Rainier National Park and immediate vicinity, Washington.
Habitat: Moist subalpine meadows.
Origin: Native
Rhexia-leaved paintbrush (Castilleja rhexiifolia)
Distribution: In the North Cascades and northeast corner of Washington; British Columbia and Alberta south to Nevada and east to New Mexico.
Habitat: Meadows and open slopes at moderate to high elevations in the mountains.
Origin: Native
Suksdorf's paintbrush (Castilleja suksdorfii)
Distribution: In Washington chiefly in the Cascades from Mt. Adams south, occasionally north to Whatcom County; south to Crater Lake, Oregon.
Habitat: Subalpine meadows and forests along streams and wet areas.
Origin: Native
Thin paintbrush (Castilleja tenuis)
Distribution: Both sides of the Cascades in Washington but more common eastward; British Columbia south to California.
Habitat: Vernally moist meadows and other moist sites, from the lowlands to moderate elevations in the mountains.
Origin: Native
Thompson's paintbrush (Castilleja thompsonii)
Distribution: East of the Cascade summits in Washington; British Columbia south to Oregon.
Habitat: Dry sagebrush deserts to high mountain ridges.
Origin: Native
Victoria's paintbrush (Castilleja victoriae)
Distribution: San Juan Islands in WA; Victoria, B.C.
Habitat: Seasonally moist balds.
Origin: Native
Yellow paintbrush (Castilleja lutescens)
Distribution: Eastern Washington; east to northwestern Montana and south through Idaho to northeastern Oregon.
Habitat: Low, dry grasslands and woodlands, occasionally to high elevations in the mountains.
Origin: Native
Paiuteweed (Suaeda calceoliformis)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout North America from Alaska south to California, east to the Great Plains, and also along the coast of eastern North America.
Habitat: Open, moist to wet areas, typically where saline.
Origin: Native
European field pansy (Viola arvensis)
Distribution: Both sides of the Cascades in Washington; introduced throughout the United States and Canada.
Habitat: Frequently escapes from cultivation.
Origin: Introduced from Europe
Fringed grass of parnassus (Parnassia fimbriata)
Distribution: Occurring on both sides of the Cascades in Washington; Alaska to California, east to Alberta, Montana and New Mexico.
Habitat: Bogs, stream banks and wet meadows, mid- to high elevations in the mountains.
Origin: Native
Parsely (Petroselinum crispum)
Distribution: escaping cultivation across much of North America.
Habitat: Disturbed areas primarily at low elevations
Origin: Introduced from Europe
Fine-leaved desert parsley (Lomatium utriculatum)
Distribution: West of the Cascades in Washington;British Columbia south to California.
Habitat: Low elevations; somewhat moist, open, often rocky areas.
Origin: Native
Field parsley-piert (Aphanes arvensis)
Distribution: Southern British Columbia south east of the Cascades to California; common in eastern United States.
Habitat: Weed of open fields and wooded slopes.
Origin: Introduced
Parsley-piert (Aphanes occidentalis)
Origin: Native
Small-fruited parsley-piert (Aphanes australis)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to Washington, also in southeastern U.S.
Habitat: Disturbed, open areas at low elevations.
Origin: Introduced
Common parsnip (Pastinaca sativa)
Distribution: Introduced and widely naturalized in North America; found in scattered locations in the Pacific Northwest.
Habitat: Roadsides, ditchbanks and other disturbed sites.
Origin: Introduced. Native to Europe.
Cow parsnip (Heracleum maximum)
Distribution: Widely distributed throughout Washington; occurring throughout North America except for southeastern and lower Midwest of U.S.
Habitat: Moist areas, low to mid-elevations.
Origin: Native
Pestle parsnip (Lomatium nudicaule)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho and Utah.
Habitat: Dry, open areas; common in shrub-steppe, but found in mountain meadows.
Origin: Native
Water parsnip (Sium suave)
Distribution: Southern British Columbia to central California, east to Newfoundland and Virginia.
Habitat: Swampy places and shallow water, in the valleys and foothills.
Origin: Native
Wild parsnip (Pastinaca sativa)
Distribution: Introduced and widely naturalized in North America; found in scattered locations in the Pacific Northwest.
Habitat: Roadsides, ditchbanks and other disturbed sites.
Origin: Introduced. Native to Europe.
Partridgefoot (Luetkea pectinata)
Distribution: Occurring in the Olympics and Cascades mountains in Washington; Alaska south to California, and in the Rocky Mountains.
Habitat: Usually on sandy soil in moist or shady places, subalpine to alpine.
Origin: Native
Western pasqueflower (Anemone occidentalis)
Distribution: In the Olympic and the Cascade mountains in Washington; British Columbia south to California, east to Montana and the Wallowa Mountains of Oregon.
Habitat: Mountain slopes and meadows at mid- to high elevations.
Origin: Native
Pathfinder (Adenocaulon bicolor)
Distribution: Both sides of the Cascades in Washington; British Columbia south to California, east through the Rockies to Wisconsin and Ontario.
Habitat: Moist, shady woods at low to mid-elevations.
Origin: Native
Cream pea (Lathyrus ochroleucus)
Distribution: Occurring east of the Cascades crest along the northern border in Washington; Alaska south to Washington, east across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Moist woods, at the edge of thickets.
Origin: Native
Drypark pea (Lathyrus bijugatus)
Origin: Native
Earth-nut pea (Lathyrus tuberosus)
Origin: Introduced
Garden pea (Pisum sativum)
Origin: Introduced
Grass pea (Lathyrus sphaericus)
Origin: Introduced
Grass pea (Lathyrus sphaericus)
Origin: Introduced
Lance-leaf scurf pea (Laedeania lanceolata)
Distribution: East of the Cascades in Washington, mostly in the central and southcentral areas of the state; Washington south to California, east to the central regions of Canada and the U.S.
Habitat: Sagebrush steppe habitat in dry areas, often where sandy.
Origin: Native
Leafy pea (Lathyrus polyphyllus)
Distribution: Occurring west of the Cascades crest in lowland Washington, and east up the Columbia River Gorge; Washington south to California.
Habitat: Prairies and open areas of low mountains.
Origin: Native
Marsh pea (Lathyrus palustris)
Distribution: Occurring along the Puget Sound and outer coast in Washington; widely distributed throughout most of North America except the Rocky Mountain and southeastern regions of the U.S.
Habitat: Chiefly in tidelands along the coast.
Origin: Native
Narrow-leaf pea (Lathyrus sylvestris)
Distribution: Occurring chiefly west of the Cascades in Washington.
Habitat: Roadsides and waste places at low elevations.
Origin: Introduced
Torrey's pea (Lathyrus torreyi)
Distribution: Occurring west of the Cascades crest in Washington; Washington south to California.
Habitat: Open prairies and clearings in the woods at low elevations.
Origin: Native
Peach (Prunus persica)
Origin: Introduced
Callery pear (Pyrus calleryana)
Distribution: Occurring in scattered locations in lowland western Washington; occurring in eastern and southeastern U.S.
Habitat: Forest edges where previously disturbed.
Origin: Introduced
Columbia prickly pear (Opuntia ×columbiana)
Distribution: Occurring east of the Cascades in Washington; southern British Columbia south to eastern Oregon.
Habitat: Plains and foothills to the lower mountains.
Origin: Native
Common pear (Pyrus communis)
Origin: Introduced
Pearleaf (Leptarrhena pyrolifolia)
Distribution: Alaska to Oregon, east to Alberta and Montana; in the Olympics and Cascades of Washington
Habitat: Streambanks, seeps and wet meadows, mid- to high elevations in the mountains
Origin: Native
Western pearlflower (Heterocodon rariflorum)
Distribution: East of the Cascades in Washington; southern British Columbia south to California, east to Idaho and Nevada.
Habitat: Moist, open places in the foothills and valleys to moderate elevations in the mountains.
Origin: Native
Alpine pearlwort (Sagina saginoides)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains in the U.S. and Alberta; east across northern Canada to Greenland.
Habitat: Open areas, typically where at least seasonally moist, from mid elevations to the alpine.
Origin: Native
Annual pearlwort (Sagina apetala)
Distribution: Occurring in the lowlands west of the Cascades crest in Washington; British Columbia south to California; Kansas.
Habitat: Waste ground.
Origin: Introduced from Europe
Bird-eye pearlwort (Sagina procumbens)
Distribution: Introduced west of the Cascades, British Columbia to California
Habitat: Moist areas, especially gardens
Origin: Introduced from Europe
Cat peas (Vicia cracca)
Distribution: Introduced and widely naturalized in eastern United States; occasional in the Rocky Mountains and westward.
Habitat: Waste land, roadsides.
Origin: Introduced
Cat peas (Vicia cracca)
Distribution: Introduced and widely naturalized in eastern United States; occasional in the Rocky Mountains and westward.
Habitat: Waste land, roadsides.
Origin: Introduced
Siberian peashrub (Caragana arborescens)
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout the western, central, and northeastern regions of North America.
Habitat: Disturbed areas including wastelots, roadsides, and fields.
Origin: Introduced
Beach peavine (Lathyrus littoralis)
Distribution: Occurring in the coastal counties in Washington; British Columbia south to California.
Habitat: Sand dunes and sandy beaches.
Origin: Native
Little pectocarya (Gruvelia pusilla)
Distribution: East of the Cascades crest in Chelan and Klickitat counties in Washington; Washington, south to California, introduced and disjunct in Chile.
Habitat: Dry, open places at lower elevations.
Origin: Native
Winged pectocarya (Pectocarya penicillata)
Distribution: East of the Cascades, southern British Columbia to Baja California, east to Idaho and Utah.
Habitat: Dry, open areas, often in sandy soil and among sagebrush, at low elevations.
Origin: Native
Pennsylvania pellitory (Parietaria pensylvanica)
Distribution: Occurring east of the Cascades crest in Washington; Yukon Territory south to California, east across southern Canada and the U.S. to the Atlantic Coast.
Habitat: Woods to shaded banks, beneath ledges of large rocks, from low to middle elevations.
Origin: Native
Eastern pellitory-of-the-wall (Parietaria officinalis)
Origin: Introduced from central and southern Europe
Pellitory-of-the-wall (Parietaria judiaca)
Origin: Introduced from Africa and Eurasia
Tinker's penny (Hypericum anagalloides)
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia south to Baja California, east to Montana.
Habitat: Moist ground, from the coast to mid-elevations in the mountains.
Origin: Native
Field pennycress (Thlaspi arvense)
Distribution: Distributed widely throughout Washington; widely introduced throughout North America.
Habitat: Weed of waste ground, low to moderate elevations.
Origin: Introduced from Europe
Perfoliate pennycress (Microthlaspi perfoliatum)
Distribution: Only found along eastern border in Washington; central and eastern U.S.
Habitat: Roadsides, pastures, and other open, disturbed ground.
Origin: Introduced from Europe
Perfoliate pennycress (Microthlaspi perfoliatum)
Distribution: Only found along eastern border in Washington; central and eastern U.S.
Habitat: Roadsides, pastures, and other open, disturbed ground.
Origin: Introduced from Europe
Pennyroyal (Mentha pulegium)
Distribution: Southern and southwestern Washington along the Columbia River; British Columbia south to California; scattered in eastern North America.
Habitat: Moist, disturbed areas.
Origin: Introduced from Europe
Blue Mountain penstemon (Penstemon venustus)
Distribution: Occurring east of the Cascades in Washington, especially in the Blue Mountains area; Washington south to California and Utah, east to Idaho.
Habitat: Open, rocky slopes, from the foothills to moderate elevations in the mountains.
Origin: Native
Broad-leaved penstemon (Penstemon ovatus)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia south to northern Oregon.
Habitat: Open woods below 3000 feet in elevation.
Origin: Native
Coast penstemon (Penstemon serrulatus)
Distribution: Occurring in the Olympics and Cascades mountains in Washington; Alaska south to Oregon.
Habitat: Moist places at mid- to high elevations in the Cascades, but at lower elevations to the west
Origin: Native
Palmer's penstemon (Penstemon palmeri)
Distribution: Reported from Spokane County in Washington; Washington south to California, east to the Rocky Mountains.
Habitat: Roadsides where seeded for soil stabilization.
Origin: Introduced from SW US
Palmer's penstemon (Penstemon palmeri)
Distribution: Reported from Spokane County in Washington; Washington south to California, east to the Rocky Mountains.
Habitat: Roadsides where seeded for soil stabilization.
Origin: Introduced from SW US
Rock penstemon (Penstemon rupicola)
Distribution: In the Cascades of Washington; Washington south to California.
Habitat: Rock cliffs and rocky slopes at mid- to high elevations in the mountains.
Origin: Native
Rydberg's penstemon (Penstemon hesperius)
Origin: Native
Showy penstemon (Penstemon speciosus)
Distribution: East of the Cascades in Washington; Washington south to California, east to Nevada and Utah.
Habitat: Dry, open or sparsely wooded areas, often with sagebrush, juniper or ponderosa pine, mostly in the lowlands and foothills.
Origin: Native
Brown's peony (Paeonia brownii)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Montana, south to Utah.
Habitat: Sagebrush deserts to ponderosa pine forests.
Origin: Native
Western peony (Paeonia brownii)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Montana, south to Utah.
Habitat: Sagebrush deserts to ponderosa pine forests.
Origin: Native
Salt and pepper (Lomatium gormanii)
Distribution: East of the Cascades in Washington; Washington south to Oregon, east to Idaho.
Habitat: Open slopes and scablands in the foothills, valleys and plains, often with sagebrush.
Origin: Native
Water pepper (Persicaria hydropiperoides)
Distribution: Chiefly west of the Cascades in Washington; British Columbia south to Mexico and South America, east across North America to the Atlantic coast.
Habitat: Moist to swampy areas, often growing in mud, from the lowlands to the lower mountain valleys.
Origin: Native
Alkali peppergrass (Lepidium dictyotum)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho, Nevada, and Utah.
Habitat: Open areas often where seasonally moist, such as vernal ponds; tolerant of alkaline soils.
Origin: Native
Branched peppergrass (Lepidium ramosissimum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout much of western and northern North America.
Habitat: Sagebrush, ponderosa pine forest openings, roadsides, fields, and other disturbed open areas.
Origin: Native
Branched peppergrass (Lepidium ramosissimum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout much of western and northern North America.
Habitat: Sagebrush, ponderosa pine forest openings, roadsides, fields, and other disturbed open areas.
Origin: Native
Broad-leaved pepperwort peppergrass (Lepidium latifolium)
Distribution: Chiefly east of the Cascades in Washington but also found in the western lowlands; widely distributed throughout central and western North America.
Habitat: Moist areas and irrigated land, but also on drier areas.
Origin: Introduced from Eurasia
Clasping-leaved peppergrass (Lepidium perfoliatum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Disturbed areas, such as overgrazed land and waste areas, usually where dry.
Origin: Introduced from Eurasia
Common peppergrass (Lepidium densiflorum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Dull peppergrass (Lepidium ramosissimum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout much of western and northern North America.
Habitat: Sagebrush, ponderosa pine forest openings, roadsides, fields, and other disturbed open areas.
Origin: Native
Elongate peppergrass (Lepidium densiflorum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Hairy-fruited peppergrass (Lepidium densiflorum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Large-fruited peppergrass (Lepidium densiflorum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Peppergrass (Lepidium latifolium)
Distribution: Chiefly east of the Cascades in Washington but also found in the western lowlands; widely distributed throughout central and western North America.
Habitat: Moist areas and irrigated land, but also on drier areas.
Origin: Introduced from Eurasia
Prairie peppergrass (Lepidium densiflorum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Round-leaved peppergrass (Lepidium perfoliatum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Disturbed areas, such as overgrazed land and waste areas, usually where dry.
Origin: Introduced from Eurasia
Sharp-toothed peppergrass (Lepidium dictyotum)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho, Nevada, and Utah.
Habitat: Open areas often where seasonally moist, such as vernal ponds; tolerant of alkaline soils.
Origin: Native
Shining peppergrass (Lepidium nitidum)
Distribution: Known from Klickitat County in Washington; Washington south to California.
Habitat: Dry, open areas at low elevation.
Origin: Native
Shining peppergrass (Lepidium nitidum)
Distribution: Known from Klickitat County in Washington; Washington south to California.
Habitat: Dry, open areas at low elevation.
Origin: Native
Upright peppergrass (Lepidium strictum)
Origin: Introduced
Veiny peppergrass (Lepidium dictyotum)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho, Nevada, and Utah.
Habitat: Open areas often where seasonally moist, such as vernal ponds; tolerant of alkaline soils.
Origin: Native
Yellow-flowered peppergrass (Lepidium perfoliatum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Disturbed areas, such as overgrazed land and waste areas, usually where dry.
Origin: Introduced from Eurasia
Peppermint (Mentha piperita)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout in North America.
Habitat: Banks of streams and ditches, bottom lands and moist roadsides.
Origin: Introduced
Clasping peppergrass pepperwort (Lepidium perfoliatum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Disturbed areas, such as overgrazed land and waste areas, usually where dry.
Origin: Introduced from Eurasia
Field peppergrass pepperwort (Lepidium campestre)
Distribution: Distributed across Washington in scattered locations; distributed throughout much of North America.
Habitat: Dry, disturbed areas.
Origin: Introduced from Eurasia
Forked pepperwort (Lepidium oxycarpum)
Distribution: Chiefly in south-central California, rare in the Pacific Northwest.
Habitat: Usually on saline soil.
Origin: Native
Garden cress pepperwort (Lepidium sativum)
Origin: Introduced from western Asia
Hoary pepperwort (Lepidium draba)
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Widespread weed in lowlands.
Origin: Introduced from Eurasia
Hoary pepperwort (Lepidium draba)
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Widespread weed in lowlands.
Origin: Introduced from Eurasia
Nelson's pepperwort (Marsilea oligospora)
Origin: Native
Pepperwort (Lepidium campestre)
Distribution: Distributed across Washington in scattered locations; distributed throughout much of North America.
Habitat: Dry, disturbed areas.
Origin: Introduced from Eurasia
Pepperwort (Lepidium campestre)
Distribution: Distributed across Washington in scattered locations; distributed throughout much of North America.
Habitat: Dry, disturbed areas.
Origin: Introduced from Eurasia
Pepperwort (Lepidium perfoliatum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Disturbed areas, such as overgrazed land and waste areas, usually where dry.
Origin: Introduced from Eurasia
Pepperwort (Lepidium sativum)
Origin: Introduced from western Asia
Pepperwort (Marsilea vestita)
Distribution: Both sides of the Cascades in Washington; British Columbia south to California, east to Minnesota and Louisiana.
Habitat: Ponds, vernal pools, floodplains.
Origin: Native
Sharpfruited pepperwort (Lepidium oxycarpum)
Distribution: Chiefly in south-central California, rare in the Pacific Northwest.
Habitat: Usually on saline soil.
Origin: Native
Smith's pepperwort (Lepidium heterophyllum)
Distribution: West of the Cascades in Washington; British Columbia south to California; in scattered locations in eastern U.S.
Habitat: Roadsides, pastures, and other disturbed ground.
Origin: Introduced from Europe
Water-clover pepperwort (Marsilea vestita)
Distribution: Both sides of the Cascades in Washington; British Columbia south to California, east to Minnesota and Louisiana.
Habitat: Ponds, vernal pools, floodplains.
Origin: Native
Greater periwinkle (Vinca major)
Distribution: Occasionally escapes from gardens, west side of the Cascades.
Habitat: Moderately moist soil.
Origin: Introduced from Europe
Lesser periwinkle (Vinca minor)
Distribution: Introduced in scattered locations across Washington, moreso in western lowlands; occurring in much of eastern North America, where it is considered invasive.
Habitat: Somewhat moist disturbed areas.
Origin: Introduced from Europe
Bolander's phacelia (Phacelia bolanderi)
Distribution: Disjunct in Pacific and Wahkiakum counties, Washington; Coos Bay, Oregon south along the coast to Sonoma County, California.
Habitat: Mostly on open, often unstable slopes at low elevations.
Origin: Native
Dwarf phacelia (Phacelia tetramera)
Origin: Native
Least phacelia (Phacelia minutissima)
Distribution: Uncommon; known from the type locality in Idaho, the Wallowa Mountains of Oregon, Elko County, Nevada, and Kittitas County, Washington.
Habitat: Moderate elevations in the mountains.
Origin: Native
Silverleaf phacelia (Phacelia hastata)
Distribution: Both sides of the Cascades in Washington; British Columbia to California, east to the Dakotas and Nebraska.
Habitat: Dry, open, often sandy areas, low to high elevations.
Origin: Native
Sticky phacelia (Phacelia glandulifera)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho, Nevada, Utah, and Wyoming.
Habitat: Open areas in sagebrush-steppe habitat.
Origin: Native
Whiteleaf phacelia (Phacelia hastata)
Distribution: Both sides of the Cascades in Washington; British Columbia to California, east to the Dakotas and Nebraska.
Habitat: Dry, open, often sandy areas, low to high elevations.
Origin: Native
Summer pheasant's-eye (Adonis aestivalis)
Distribution: Introduced and occasionallhy escaping, but marginally persistant; uncommon in the Pacific Northwest.
Habitat: Disturbed areas.
Origin: Introduced from Europe
Clumped phlox (Phlox caespitosa)
Distribution: East of the Cascades, British Columbia to California, east to Colorado
Habitat: Primarily in and near Ponderosa pine forest.
Origin: Native
Clustered phlox (Phlox caespitosa)
Distribution: East of the Cascades, British Columbia to California, east to Colorado
Habitat: Primarily in and near Ponderosa pine forest.
Origin: Native
Hood's phlox (Phlox hoodii)
Distribution: Occurring east of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains and Great Plains in the north.
Habitat: Dry, open places in the plains and foothills, often in lithosol, occasionally to moderate elevations in the mountains.
Origin: Native
Long-leaf phlox (Phlox longifolia)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Dry, open, rocky places, from the lowlands to moderate or occasionally high elevations in the mountains.
Origin: Native
Many-flowered phlox (Phlox multiflora)
Origin: Native
Prickly phlox (Linanthus pungens)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to Baja California, east to Montana and New Mexico.
Habitat: Dry, open, sandy or rocky places, from the deserts and plains to moderate elevations in the drier mountains.
Origin: Native
Showy phlox (Phlox speciosa)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Idaho, Montana, Nevada, Arizona, and New Mexico.
Habitat: Shrub-steppe, often with sagebrush, and in ponderosa pine areas.
Origin: Native
Showy phlox (Phlox speciosa)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Idaho, Montana, Nevada, Arizona, and New Mexico.
Habitat: Shrub-steppe, often with sagebrush, and in ponderosa pine areas.
Origin: Native
Showy phlox (Phlox speciosa)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Idaho, Montana, Nevada, Arizona, and New Mexico.
Habitat: Shrub-steppe, often with sagebrush, and in ponderosa pine areas.
Origin: Native
Showy phlox (Phlox speciosa)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Idaho, Montana, Nevada, Arizona, and New Mexico.
Habitat: Shrub-steppe, often with sagebrush, and in ponderosa pine areas.
Origin: Native
Showy phlox (Phlox speciosa)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Idaho, Montana, Nevada, Arizona, and New Mexico.
Habitat: Shrub-steppe, often with sagebrush, and in ponderosa pine areas.
Origin: Native
Slender phlox (Microsteris gracilis)
Distribution: Widely distributed throughout Washington; Alaska south to California, east to the Rocky Mountains and the Great Plains in the U.S.
Habitat: Lowlands and foothills in open, dry to moderately moist places.
Origin: Native
Snake River phlox (Phlox colubrina)
Origin: Native
Soft phlox (Phlox mollis)
Origin: Native
Sticky phlox (Phlox viscida)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to Arizona, east to Idaho, Utah, and New Mexico.
Habitat: Open areas in grasslands and ponderosa pine forest.
Origin: Native
Stiff phlox (Phlox caespitosa)
Distribution: East of the Cascades, British Columbia to California, east to Colorado
Habitat: Primarily in and near Ponderosa pine forest.
Origin: Native
Tufted phlox (Phlox caespitosa)
Distribution: East of the Cascades, British Columbia to California, east to Colorado
Habitat: Primarily in and near Ponderosa pine forest.
Origin: Native
Yeti phlox (Phlox solivaga)
Origin: Native
Pickelweed (Sarcocornia perennis)
Distribution: Along the coast in Washington; Alaska south to Baja California, also on Atlantic coast, Europe, and Mediterranean region.
Habitat: Salt marshes and beaches along coast.
Origin: Native
Pickerel-weed (Pontederia cordata)
Origin: Introduced
Pickleweed (Sarcocornia perennis)
Distribution: Along the coast in Washington; Alaska south to Baja California, also on Atlantic coast, Europe, and Mediterranean region.
Habitat: Salt marshes and beaches along coast.
Origin: Native
Piggyback-plant (Tolmiea menziesii)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska south to California.
Habitat: Moist woods and stream banks, low lands and low elevations in the mountains.
Origin: Native
Green pigweed (Amaranthus hybridus)
Distribution: Found in much of the United States, but uncommon in the Pacific Northwest; collected in Whitman County
Habitat: Dry areas, disturbed sites, agricultural fields.
Origin: Introduced from riparian zones in eastern North America
Pigweed (Chenopodium album)
Distribution: Widely distributed throughout Washington; widely distributed throughout much of temperate North America.
Habitat: Widespread weed of disturbed areas, including gardens, roadsides, and waste lots.
Origin: Introduced from Europe, but some populations in the mid-west may be native to North America, according to FNA.
Prostrate pigweed (Amaranthus blitoides)
Distribution: Introduced in the Pacific Northwest; more common east of the Cascades
Habitat: Dry, disturbed areas
Origin: Introduced from central United States
Redroot pigweed (Amaranthus retroflexus)
Distribution: In scattered locations throughout Washington, but more commonly east of the Cascade crest; widely distributed throughout much of North America.
Habitat: Disturbed areas.
Origin: Introduced from eastern and central North America
Rough pigweed (Amaranthus retroflexus)
Distribution: In scattered locations throughout Washington, but more commonly east of the Cascade crest; widely distributed throughout much of North America.
Habitat: Disturbed areas.
Origin: Introduced from eastern and central North America
Smooth pigweed (Amaranthus hybridus)
Distribution: Found in much of the United States, but uncommon in the Pacific Northwest; collected in Whitman County
Habitat: Dry areas, disturbed sites, agricultural fields.
Origin: Introduced from riparian zones in eastern North America
White pigweed (Amaranthus albus)
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Dry, disturbed areas.
Origin: Introduced from tropical America
American pillwort (Pilularia americana)
Origin: Native
False pimpernel (Lindernia dubia)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout North America.
Habitat: Disturbed, open soil, often where moist near ponds, lakes, and streams, from low to middle elevations.
Origin: Native
False pimpernel (Lindernia dubia)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout North America.
Habitat: Disturbed, open soil, often where moist near ponds, lakes, and streams, from low to middle elevations.
Origin: Native
False pimpernel (Lindernia dubia)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout North America.
Habitat: Disturbed, open soil, often where moist near ponds, lakes, and streams, from low to middle elevations.
Origin: Native
Scarlet pimpernel (Anagallis arvensis)
Distribution: Scattered locations on both sides of the Cascades in Washington; widely distributed throughout North America.
Habitat: Weed of disturbed open areas, waste ground.
Origin: Introduced from from Eurasia
Scarlet pimpernel (Anagallis arvensis)
Distribution: Scattered locations on both sides of the Cascades in Washington; widely distributed throughout North America.
Habitat: Weed of disturbed open areas, waste ground.
Origin: Introduced from from Eurasia
Water pimpernel (Samolus parviflorus)
Origin: Native
Thompson's pincushion (Chaenactis thompsonii)
Distribution: Occurring primarily in the serpentine slopes of the Wenatchee Mountains in Washington.
Habitat: Open, usually rocky areas, at moderate to mid-elevations in the mountains.
Origin: Native, endemic to WA
Alva Day’s pincushion-plant (Navarretia sinistra)
Origin: Native
Marigold pincushion-plant (Navarretia tagetina)
Distribution: Klickitat County, Washington, south to California.
Habitat: Dry, open places at low elevations.
Origin: Native
Yellow pincushion-plant (Navarretia breweri)
Distribution: East of the Cascades, Douglas County, Washington, south to California, east to Wyoming and Arizona
Habitat: Dry, open areas and meadows, from the foothills to moderate elevations in the mountains
Origin: Native
Ground pine (Lycopodium clavatum)
Distribution: Both sides of the Cascades in Washington; British Columbia south to California in western North America; circumboreal.
Habitat: Moist coniferous woods and swamps.
Origin: Native
Running pine (Lycopodium clavatum)
Distribution: Both sides of the Cascades in Washington; British Columbia south to California in western North America; circumboreal.
Habitat: Moist coniferous woods and swamps.
Origin: Native
Western white pine (Pinus monticola)
Distribution: British Columbia to California, east to Utah and Montana; in the Washington Olympics
Habitat: Moist valleys and drier slopes, near sea level to mid-elevations in the mountains
Origin: Native
White-bark pine (Pinus albicaulis)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Wyoming and Montana.
Habitat: Generally near timberline, preferring south-facing slopes.
Origin: Native
Woodland pinedrops (Pterospora andromedea)
Distribution: Widely distributed throughout Washington; British Columbia south to California, east to South Dakota and Texas.
Habitat: Common in humas in coniferous forests, especially ponderosa pine forests.
Origin: Native
California pinefoot (Pityopus californicus)
Origin: Native
Pinegrass (Calamagrostis rubescens)
Distribution: British Columbia to California, east to Alberta, Montana and Colorado
Habitat: Dry to moist areas, open sagebrush flats to timbered slopes, moderate to mid-elevations in the mountains
Origin: Native
Fringed pinesap (Pleuricospora fimbriolata)
Distribution: Western slope of the Cascades and the Olympic Mountains in Washington; Washington south to California.
Habitat: Uncommon in coniferous forests at mid-elevations.
Origin: Native
Deptford pink (Dianthus armeria)
Distribution: Introduced in most of the United States
Habitat: Escaped from gardens
Origin: Introduced from Europe
Maiden pink (Dianthus deltoides)
Origin: Introduced from Europe
Pinkfairies (Clarkia pulchella)
Distribution: Chiefly east of the Cascades in Washington; British Columbia to Oregon, east to South Dakota.
Habitat: Dry, open slopes, low to mid-elevations.
Origin: Native
Large cuckoo pint (Arum italicum)
Distribution: Limited number of locations in western Washington; south to California; scattered location in central and eastern U.S.
Habitat: Forest understory and disturbed locations near urbanized areas.
Origin: Introduced from Europe
Devil's pitchfork (Bidens frondosa)
Distribution: Widely distributed throughout much of Washington; widely distributed throughout North America except Alaska and northernmost Canada.
Habitat: Wet areas at low elevations.
Origin: Native
Flax-leaved plainsmustard (Sisymbrium linifolium)
Distribution: East of the Cascades crest in Washington; British Columbia south to Arizona (not including California), east to the Rocky Mountains.
Habitat: Sagebrush-steppe communities, rock crevices.
Origin: Native
Flax-leaved plainsmustard (Sisymbrium linifolium)
Distribution: East of the Cascades crest in Washington; British Columbia south to Arizona (not including California), east to the Rocky Mountains.
Habitat: Sagebrush-steppe communities, rock crevices.
Origin: Native
Salmon River plainsmustard (Sisymbrium linifolium)
Distribution: East of the Cascades crest in Washington; British Columbia south to Arizona (not including California), east to the Rocky Mountains.
Habitat: Sagebrush-steppe communities, rock crevices.
Origin: Native
Salmon River plainsmustard (Sisymbrium linifolium)
Distribution: East of the Cascades crest in Washington; British Columbia south to Arizona (not including California), east to the Rocky Mountains.
Habitat: Sagebrush-steppe communities, rock crevices.
Origin: Native
American plane-tree (Platanus occidentalis)
Distribution: Occurring along the shores of the Columbia River in central Washington; common and native east of the Rocky Mountains, often introduced in western United States.
Habitat: Near streams and lakes, in moist ravines.
Origin: Introduced
Cotton batting plant (Pseudognaphalium stramineum)
Distribution: Widely distributed throughout much of Washington; British Columbia south to California, east to the Great Plains of the U.S.; New York south to South Carolina.
Habitat: Open, usually moist places, often on disturbed soil.
Origin: Native
Cotton batting plant (Pseudognaphalium stramineum)
Distribution: Widely distributed throughout much of Washington; British Columbia south to California, east to the Great Plains of the U.S.; New York south to South Carolina.
Habitat: Open, usually moist places, often on disturbed soil.
Origin: Native
Gopher plant (Euphorbia lathyris)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia south to California and Arizona, widely distributed in eastern North America.
Habitat: Disturbed soil and wasteland.
Origin: Introduced from Eurasia
Mole plant (Euphorbia lathyris)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia south to California and Arizona, widely distributed in eastern North America.
Habitat: Disturbed soil and wasteland.
Origin: Introduced from Eurasia
Money plant (Lunaria annua)
Distribution: Distributed in scattered locations across Washington; British Columbia south to California and Utah; also distributed throughout eastern North America.
Habitat: Escaping from cultivation to urban forests, roadsides, and other disturbed areas.
Origin: Introduced from SE Europe
Monument plant (Frasera speciosa)
Distribution: Chiefly east of the Cascades in Washington; Washington south to California, east to the Rocky Mountains, Texas and South Dakota.
Habitat: Open areas to open forests, foothills to subalpine slopes.
Origin: Native
Oyster plant (Tragopogon porrifolius)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Roadsides, fields and waste places, usually where moist.
Origin: Introduced from Europe
White-topped pitcher plant (Sarracenia leucophylla)
Origin: Introduced from SE US
Yellow bee plant (Peritoma lutea)
Distribution: East of the Cascades in Washington; widely distributed throughout western U.S.
Habitat: Sagebrush desert to Ponderosa pine forests.
Origin: Native
Yellow bee plant (Peritoma lutea)
Distribution: East of the Cascades in Washington; widely distributed throughout western U.S.
Habitat: Sagebrush desert to Ponderosa pine forests.
Origin: Native
Yellow pitcher plant (Sarracenia flava)
Distribution: Native in southeastern United States; introduced in western Washington.
Habitat: Swamps, bogs and seeps.
Origin: Introduced from SE US
Alaska plantain (Plantago macrocarpa)
Distribution: Occurring along the outer coast in Washington; Alaska south to Oregon.
Habitat: Coastal wetlands.
Origin: Native
Buck-horn plantain (Plantago coronopus)
Distribution: West of the Cascades along the coast in Washington; British Columbia south to California; scattered locations in central and eastern North America.
Habitat: Occasional at low elevations along the coast in sandy or disturbed areas.
Origin: Introduced
Common plantain (Plantago major)
Distribution: Widely distributed throughout Washington; a cosmopolitan weed widely distributed throughout North America.
Habitat: Roadsides, fields and other disturbed, open areas.
Origin: Introduced from Europe
Dwarf plantain (Plantago pusilla)
Origin: Introduced from E. NA
English plantain (Plantago lanceolata)
Distribution: Widely distributed throughout Washington; a cosmopolitan weed distributed widely throughout North America.
Habitat: Roadsides, fields and other disturbed, open areas.
Origin: Introduced from Europe
Great plantain (Plantago major)
Distribution: Widely distributed throughout Washington; a cosmopolitan weed widely distributed throughout North America.
Habitat: Roadsides, fields and other disturbed, open areas.
Origin: Introduced from Europe
Large-bract plantain (Plantago aristata)
Origin: Introduced from southern U.S.
Mexican plantain (Plantago subnuda)
Distribution: West of the Cascades in Washington in the southwestern portion of the state; Washington south to California.
Habitat: Tidal flats and coastal bluffs.
Origin: Native
Salt marsh plantain (Plantago maritima)
Distribution: West of the Cascades in Washington along the coast; British Columbia south to California.
Habitat: Salt marshes, bluffs and cliffs along the coast.
Origin: Native
Sand plantain (Plantago psyllium)
Distribution: Scattered locations west of the Cascades in Washington; British Columbia south to California; upper central and eastern North America.
Habitat: A weed of waste places, sandy areas, roadsides, and along railroad tracks.
Origin: Introduced from Old World
Sea plantain (Plantago maritima)
Distribution: West of the Cascades in Washington along the coast; British Columbia south to California.
Habitat: Salt marshes, bluffs and cliffs along the coast.
Origin: Native
Seaside plantain (Plantago maritima)
Distribution: West of the Cascades in Washington along the coast; British Columbia south to California.
Habitat: Salt marshes, bluffs and cliffs along the coast.
Origin: Native
Slender plantain (Plantago elongata)
Distribution: West of the Cascades in Washington, often along the coast; British Columbia south to California, east to Minnesota and Texas.
Habitat: Moist, somewhat saline areas.
Origin: Native
Tall coastal plantain (Plantago subnuda)
Distribution: West of the Cascades in Washington in the southwestern portion of the state; Washington south to California.
Habitat: Tidal flats and coastal bluffs.
Origin: Native
Woolly plantain (Plantago patagonica)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to Texas.
Habitat: Dry, open places in the foothills and plains.
Origin: Native
Long-horn plectritis (Plectritis macrocera)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Vernally moist, open areas; common in shrub-steppe
Origin: Native
Long-spurred plectritis (Plectritis ciliosa)
Distribution: Klickitat County, Washington, south through western Oregon to California.
Habitat: Vernally moist, open slopes and meadows.
Origin: Native
Rosy plectritis (Plectritis congesta)
Distribution: In Washington occurring west of the Cascades crest and in the Columbia River Gorge; Vancouver Island south to California.
Habitat: Open, vernally moist meadows and slopes, sea level to moderate elevations in the moutains.
Origin: Native
Shortspur white plectritis (Plectritis brachystemon)
Distribution: In Washington occurring west of the Cascades crest and in the Columbia River Gorge; southern British Columbia south to California.
Habitat: Coastal bluffs, lowland prairies, balds at low elevations in the mountains.
Origin: Native
White plectritis (Plectritis macrocera)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Vernally moist, open areas; common in shrub-steppe
Origin: Native
American plum (Prunus americana)
Distribution: Northeast Canada and United States, occasionally west to Montana and Utah; rare in Washington.
Habitat: Along watercourses, and on open or wooded, moist or dry areas from the plains into the lower mountains.
Origin: Introduced
Cherry plum (Prunus cerasifera)
Distribution: Introduced and escaped, mostly in Western Washington, but also in southeast Washington.
Habitat: Open, disturbed areas.
Origin: Introduced
Cultivated plum (Prunus domestica)
Distribution: Occurring on both sides of the Cascades in Washington; Washington south to California, east to Idaho and Utah; in scattered locations of central and northeastern U.S.
Habitat: Fields, roadsides, forest openings, abandoned homesteads, and other disturbed areas.
Origin: Introduced
Wild plum (Prunus americana)
Distribution: Northeast Canada and United States, occasionally west to Montana and Utah; rare in Washington.
Habitat: Along watercourses, and on open or wooded, moist or dry areas from the plains into the lower mountains.
Origin: Introduced
Italian plumeless thistle (Carduus pycnocephalus)
Distribution: Washington to California and Idaho, also in central and eastern U.S.
Habitat: Disturbed, open areas at low elevation.
Origin: European introduction
Podfern (Aspidotis densa)
Distribution: British Columbia to California, east to Idaho and Montana
Habitat: Cliff crevices and moist, rocky slopes, foothills to near timberline, often on serpentine
Origin: Native
Fish poison (Croton setiger)
Distribution: East of the Cascades crest in Washington; Washington south to Baja California.
Habitat: Chiefly in semi-desert conditions, but to the coast in California.
Origin: Native
Fish poison (Croton setiger)
Distribution: East of the Cascades crest in Washington; Washington south to Baja California.
Habitat: Chiefly in semi-desert conditions, but to the coast in California.
Origin: Native
Poison-hemlock (Conium maculatum)
Distribution: Widely distributed throughout Washington; widely distributed throughout North America
Habitat: Disturbed areas in moist soil.
Origin: Introduced. Native to Europe.
Pacific poison-oak (Toxicodendron diversilobum)
Distribution: Mainly west of the Cascades in Washington; British Columbia south to California, east to Nevada.
Habitat: Open woods at low elevations.
Origin: Native
Annual polemonium (Polemonium micranthum)
Distribution: Chiefly east of the Cascades, British Columbia to California, east to North Dakota and Utah
Habitat: Common is open plains and foothills, often with sagebrush
Origin: Native
Elegant polemonium (Polemonium elegans)
Distribution: Occurring in the Olympics and Cascades mountains in Washington; British Columbia south to Washington.
Habitat: Open, often rocky areas, mid- to high elevations in the mountains.
Origin: Native
Great polemonium (Polemonium carneum)
Distribution: Olympic and Grays Harbor region of Washington, and Skamania County in Washington south through the Cascades to the Klamath region of Oregon and adjacent California.
Habitat: Thickets, woodlands and forest openings, from near sea level to moderate elevations in the mountains.
Origin: Native
Salmon polemonium (Polemonium carneum)
Distribution: Olympic and Grays Harbor region of Washington, and Skamania County in Washington south through the Cascades to the Klamath region of Oregon and adjacent California.
Habitat: Thickets, woodlands and forest openings, from near sea level to moderate elevations in the mountains.
Origin: Native
Sticky polemonium (Polemonium viscosum)
Distribution: Know only from Okanogan County, Washington in Washington; British Columbia south to Oregon and Nevada, east to the Rocky Mountains.
Habitat: Open rocky places at high elevations in the mountains, commonly above timberline.
Origin: Native
Washington polemonium (Polemonium pectinatum)
Distribution: Known only from North Whitman County and south Spokane County, Washington.
Habitat: Moist bottom lands.
Origin: Native
Irregular polypody (Polypodium amorphum)
Origin: Native
Leathery polypody (Polypodium scouleri)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south along the coast to California.
Habitat: Cliffs and rocky outcroppings along the coast.
Origin: Native
Scouler's polypody (Polypodium scouleri)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south along the coast to California.
Habitat: Cliffs and rocky outcroppings along the coast.
Origin: Native
Western polypody (Polypodium hesperium)
Distribution: Chiefly east of the Cascades, British Columbia to California, east to Montana, Colorado and New Mexico
Habitat: Moist cliffs, ledges and rock crevices, lowlands to mid-elevations in the mountains
Origin: Native
Blunt-leaved pondweed (Potamogeton obtusifolius)
Origin: Native
Broad-leaved pondweed (Potamogeton amplifolius)
Distribution: British Columbia to Newfoundland, south to California in the west and Alabama in the eastern United States, but absent from Nevada to Texas; common west of the Cascades in Washington
Habitat: Generally in fairly deep water
Origin: Native
Clasping-leaved pondweed (Potamogeton richardsonii)
Distribution: Alaska to Maine, south to California and New Mexico in the west and Illimois in eastern United states; more common west of the Cascades in Washington
Habitat: Standing or slow-moving water
Origin: Native
Curly pondweed (Potamogeton crispus)
Distribution: Introduced in much of North America; central and western Washington, western Oregon, and California.
Habitat: Ponds and streams, often forming mats.
Origin: Introduced from Eurasia
Eel-grass pondweed (Potamogeton zosteriformis)
Distribution: British Columbia south on both sides of the Cascades to California, east to Idaho and Montana, and much of north central and northeast United States and adjacent Canada.
Habitat: Lakes, ponds and streams.
Origin: Native
Fennel-leaved pondweed (Stuckenia pectinata)
Distribution: Both sides of the Cascades in Washington; common throughout North America; Eurasia
Habitat: Shallow, fresh to brackish water.
Origin: Native
Fern pondweed (Potamogeton robbinsii)
Distribution: Alaska to California, east to Montana and Colorado; Minnesota to Maine, south to Virginia in eastern United States
Habitat: Quiet water, mostly in lakes
Origin: Native
Flat-stalked pondweed (Potamogeton friesii)
Origin: Native
Flat-stem pondweed (Potamogeton zosteriformis)
Distribution: British Columbia south on both sides of the Cascades to California, east to Idaho and Montana, and much of north central and northeast United States and adjacent Canada.
Habitat: Lakes, ponds and streams.
Origin: Native
Floating pondweed (Potamogeton natans)
Distribution: Alaska south on both sides of the Cascades to California, east to Arizona and northeast United States.
Habitat: In rather shallow, standing water, often where brackish.
Origin: Native
Floating-leaved pondweed (Potamogeton natans)
Distribution: Alaska south on both sides of the Cascades to California, east to Arizona and northeast United States.
Habitat: In rather shallow, standing water, often where brackish.
Origin: Native
Grassy pondweed (Potamogeton gramineus)
Distribution: Alaska to Maine, south to California and New Mexico in the west and West Virginia in eastern United states
Habitat: Standing or running water
Origin: Native
Horned pondweed (Zannichellia palustris)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Fresh to brackish, standing to slow-flowing water, sea level to moderate elevations in the mountains.
Origin: Native
Hybrid pondweed (Potamogeton ×nericus)
Origin: Native
Illinois pondweed (Potamogeton illinoensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; Northwest Territories south to California, east across North America in scattered locations to the Atlantic Coast.
Habitat: Ponds and lakes, usually in rather deep, quiet water.
Origin: Native
Large-leaved pondweed (Potamogeton amplifolius)
Distribution: British Columbia to Newfoundland, south to California in the west and Alabama in the eastern United States, but absent from Nevada to Texas; common west of the Cascades in Washington
Habitat: Generally in fairly deep water
Origin: Native
Loddon's pondweed (Potamogeton nodosus)
Distribution: British Columbia south on both sides of the Cascades to Mexico; east over most of the United States.
Habitat: Shallow to rather deep water.
Origin: Native
Long-leaved pondweed (Potamogeton nodosus)
Distribution: British Columbia south on both sides of the Cascades to Mexico; east over most of the United States.
Habitat: Shallow to rather deep water.
Origin: Native
Narrowleaf pondweed (Potamogeton strictifolius)
Origin: Native
Northern pondweed (Potamogeton alpinus)
Origin: Native
Reddish pondweed (Potamogeton alpinus)
Origin: Native
Ribbon-leaved pondweed (Potamogeton epihydrus)
Distribution: Alaska south on both sides of the Cascades to California, east to Newfoundland and northeastern United States.
Habitat: Shallow to deep water.
Origin: Native
Richardson's pondweed (Potamogeton richardsonii)
Distribution: Alaska to Maine, south to California and New Mexico in the west and Illimois in eastern United states; more common west of the Cascades in Washington
Habitat: Standing or slow-moving water
Origin: Native
Robbin's pondweed (Potamogeton robbinsii)
Distribution: Alaska to California, east to Montana and Colorado; Minnesota to Maine, south to Virginia in eastern United States
Habitat: Quiet water, mostly in lakes
Origin: Native
Sago pondweed (Stuckenia pectinata)
Distribution: Both sides of the Cascades in Washington; common throughout North America; Eurasia
Habitat: Shallow, fresh to brackish water.
Origin: Native
Variable pondweed (Potamogeton gramineus)
Distribution: Alaska to Maine, south to California and New Mexico in the west and West Virginia in eastern United states
Habitat: Standing or running water
Origin: Native
White-stalked pondweed (Potamogeton praelongus)
Distribution: Alaska south on both sides of the Cascades to California, east through Canada to Newfoundland, south to New York and Indiana.
Habitat: In the Pacific Northwest, mostly in deep water of lakes.
Origin: Native
Whitestem pondweed (Potamogeton praelongus)
Distribution: Alaska south on both sides of the Cascades to California, east through Canada to Newfoundland, south to New York and Indiana.
Habitat: In the Pacific Northwest, mostly in deep water of lakes.
Origin: Native
Gray poplar (Populus ×canescens)
Origin: Introduced from Europe
Lombardy poplar (Populus nigra)
Origin: Introduced
White poplar (Populus alba)
Distribution: Distributed on both sides of the Cascades in Washington; widely distributed throughout North America.
Habitat: Disturbed areas often associated with urban and suburban areas, riparian zones.
Origin: Introduced from Europe
Corn poppy (Papaver rhoeas)
Distribution: Widely introduced and often escaping in scattered locations in the Pacific Northwest.
Habitat: Disturbed ground, old fields.
Origin: Introduced from Europe
Long prickly-head poppy (Papaver argemone)
Distribution: Introduced from Europe and occasionally escaping, established in scattered localities east of the Cascades in Washington.
Habitat: Disturbed soil.
Origin: Introduced from Europe
Opium poppy (Papaver somniferum)
Distribution: Introduced and often escaping from cultivation, persisting for a short time.
Habitat: Waste areas, roadsides.
Origin: Introduced from Eurasia
Welsh poppy (Meconopsis cambrica)
Distribution: Occurring in lowland western Cascades in Washington; southern British Columbia to Washington, perhaps introduced elsewhere.
Habitat: Forest edge where disturbed.
Origin: Introduced
Poque (Kopsiopsis hookeri)
Distribution: West of the Cascades crest in Washington along the Puget Sound and outer coasts; British Columbia south to California.
Habitat: Myco-heterotrophic on Gaultheria shallon, which occurs primarily in forest understories, along forest edges, and in forest and meadow openings at low to moderate elevations.
Origin: Native
Poque (Kopsiopsis hookeri)
Distribution: West of the Cascades crest in Washington along the Puget Sound and outer coasts; British Columbia south to California.
Habitat: Myco-heterotrophic on Gaultheria shallon, which occurs primarily in forest understories, along forest edges, and in forest and meadow openings at low to moderate elevations.
Origin: Native
Duck potato (Sagittaria latifolia)
Distribution: Occurring on both sides of the Cascades in Washington; Vancouver Island, British Columbia south to central California; primary distribution in central and eastern North America.
Habitat: Ditches, ponds, lakes, swampy areas.
Origin: Native
Irish potato (Solanum tuberosum)
Origin: Introduced from Europe
Nuttall's povertyweed (Monolepis nuttalliana)
Distribution: East of the Cascades, southern British Columbia south to southern California, east to Manitoba, Missouri and New Mexico.
Habitat: Dry to moist, saline or alkaline soil, from the desert plains to mid-elevations in he mountains.
Origin: Native
Red povertyweed (Micromonolepis pusilla)
Distribution: Occurring in central Washington; disjunct in central Washington, otherwise from southern Oregon to California, Nevada, Utah, Wyoming, and Colorado.
Habitat: Sagebrush-steppe desert, often where alkaline.
Origin: Native
Blue Mountain prairie-clover (Dalea ornata)
Distribution: Distributed in the central and southeastern counties in Washington; Washington south to California, east to Idaho and Nevada.
Habitat: Dry, rocky or sandy areas, often in sagebrush, low to moderate elevations.
Origin: Native
Foxtail pricklegrass (Crypsis alopecuroides)
Distribution: Occurring in the south-central areas of Washington;
Habitat: Sandy soils around drying lake margins and other seasonally moist, disturbed, open areas.
Origin: Introduced from n. Africa and Eurasia
Modest pricklegrass (Crypsis vaginiflora)
Origin: Introduced from the western Mediterranean
Brittle prickly-pear (Opuntia fragilis)
Distribution: British Columbia to California, east to Michigan and Texas
Habitat: Dry, open, often sandy soil
Origin: Native
Little prickly-pear (Opuntia fragilis)
Distribution: British Columbia to California, east to Michigan and Texas
Habitat: Dry, open, often sandy soil
Origin: Native
Cliff dwarf primrose (Douglasia laevigata)
Distribution: Alaska to Oregon.
Habitat: Moist coastal bluffs to rocky alpine ridges.
Origin: Native
Long-leaf evening primrose (Taraxia subacaulis)
Distribution: Occurring east of the Cascades in Washington; Washington south to California, east to Montana and Colorado.
Habitat: Meadows, benchland, and stream banks, from sagbrush plains to moderate elevations in the mountains, usually where dry by late summer.
Origin: Native
Long-leaf evening primrose (Taraxia subacaulis)
Distribution: Occurring east of the Cascades in Washington; Washington south to California, east to Montana and Colorado.
Habitat: Meadows, benchland, and stream banks, from sagbrush plains to moderate elevations in the mountains, usually where dry by late summer.
Origin: Native
Small-flowered evening primrose (Eremothera minor)
Distribution: East of the Cascades in Washington; Washington south to California, east to Montana and Colorado.
Habitat: Sagebrush desert, often where vernally moist
Origin: Native
Small-flowered evening primrose (Eremothera minor)
Distribution: East of the Cascades in Washington; Washington south to California, east to Montana and Colorado.
Habitat: Sagebrush desert, often where vernally moist
Origin: Native
Tansy-leaf evening primrose (Taraxia tanacetifolia)
Distribution: East of the Cascades, Washington to California, east to Idaho and Nevada
Habitat: Dry, often sandy or gravelly ground, low to moderate elevations
Origin: Native
Water primrose (Ludwigia hexapetala)
Distribution: Scattered locations throughout Washington; along Columbia River near Portland, OR, introduced in much of North America.
Habitat: Swamps, lakes, and streams.
Origin: Introduced from South America
Large-flower primrose-willow (Ludwigia hexapetala)
Distribution: Scattered locations throughout Washington; along Columbia River near Portland, OR, introduced in much of North America.
Habitat: Swamps, lakes, and streams.
Origin: Introduced from South America
Marsh primrose-willow (Ludwigia palustris)
Distribution: West side of the Cascades and along the Columbia River in Washington; widespread in North America, Africa and Eurasia.
Habitat: Marshes and bogs.
Origin: Native
Little prince's-pine (Chimaphila menziesii)
Distribution: Distributed on both sides of the Cascades in Washington; British Columbia to California, east to Montana and Utah.
Habitat: Coniferous forests at moderate to mid-elevations in the mountains.
Origin: Native
Princess-feather (Persicaria orientalis)
Origin: Introduced
Common privet (Ligustrum vulgare)
Distribution: Occurring west of the Cascades in Washington; British Columbia south to Texas, east to the Atlantic Coast
Habitat: At low elevations in forest understory, forest and prairie edges, and disturbed areas.
Origin: Introduced
Professor-weed (Galega officinalis)
Distribution: Occurring west of the Cascades crest in Washington; occurring in scattered locations throughout North America, though not along the southern border.
Habitat: Disturbed areas including wastelots, roadsides, and fields.
Origin: Introduced
Columbian puccoon (Lithospermum ruderale)
Distribution: Common east of the Cascades in southern British Columbia, Washington and Oregon
Habitat: Shrub-steppe to open, dry areas in the mountains at mid-elevations
Origin: Native
Silver puffs (Uropappus lindleyi)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Idaho, south to Texas.
Habitat: Open hillsides, forest openings, from low to mid-elevations.
Origin: Native
Long purples (Lythrum salicaria)
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Noxious weed of standing water and wet ground.
Origin: Introduced from Europe
Common purslane (Portulaca oleracea)
Distribution: Introduced from southern Europe and widely distributed in the United States.
Habitat: Gardens, disturbed soil
Origin: Introduced from Europe
Pussypaws (Calyptridium umbellatum)
Distribution: In Washington occurring throughout the Cascades Mountains; British Columbia south to Baja California, east to Montana, Wyoming and Utah.
Habitat: Ponderosa pine woods, to subalpine sandy flats and knolls, to the alpine.
Origin: Native
Rosy pussypaws (Calyptridium roseum)
Origin: Native
Alpine pussytoes (Antennaria alpina)
Distribution: Chiefly in the Cascades and Olympic Mountains of Washington; Circumboreal, extending south in the high mountains to California and Colorado.
Habitat: Alpine meadows.
Origin: Native
Alpine pussytoes (Antennaria media)
Distribution: Circumboreal, south at high elevations in the mountains to California and Arizona
Habitat: Uncommon in high mountain meadows
Origin: Native
Brown-bract pussytoes (Antennaria umbrinella)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Uncommon in openings in the forest at moderate elevations.
Origin: Native
Cushion pussytoes (Antennaria dimorpha)
Distribution: British Columbia to southern California, east to Montana, Nebraska and Colorado; east of the Cascades in central and eastern Washington.
Habitat: Dry, open places in lowlands to foothills.
Origin: Native
Flagellate pussytoes (Antennaria flagellaris)
Distribution: East of the Cascades in Washington and Oregon, east to Wyoming
Habitat: Shrub-steppe to dry, open areas at mid-elevations, often in lithosol
Origin: Native
Flat topped pussytoes (Antennaria corymbosa)
Origin: Native
Geyer's pussytoes (Antennaria geyeri)
Origin: Native
Hooker's pussytoes (Antennaria racemosa)
Distribution: Widely distributed throughout the forested and mountainous areas of Washington; British Columbia south to California, east to the northern Rocky Mountains.
Habitat: Open, modertely dry areas from low to mid-elevations in the mountains.
Origin: Native
Little-leaf pussytoes (Antennaria parvifolia)
Distribution: Eastern base of the Rocky Mountains, extending westward rarely to eastern Washington and British Columbia.
Habitat: Foothills and dry open areas to moderate elevations.
Origin: Native
Low pussytoes (Antennaria dimorpha)
Distribution: British Columbia to southern California, east to Montana, Nebraska and Colorado; east of the Cascades in central and eastern Washington.
Habitat: Dry, open places in lowlands to foothills.
Origin: Native
Meadow pussytoes (Antennaria corymbosa)
Origin: Native
Narrowleaved pussytoes (Antennaria stenophylla)
Distribution: East of the Cascades crest in Washington; Washington south to Nevada, east to Idaho.
Habitat: Shrub-steppe, dry meadows and open woods.
Origin: Native
Pinewoods pussytoes (Antennaria geyeri)
Origin: Native
Pygmy pussytoes (Antennaria monocephala)
Origin: Native
Raceme pussytoes (Antennaria racemosa)
Distribution: Widely distributed throughout the forested and mountainous areas of Washington; British Columbia south to California, east to the northern Rocky Mountains.
Habitat: Open, modertely dry areas from low to mid-elevations in the mountains.
Origin: Native
Rocky Mountain pussytoes (Antennaria media)
Distribution: Circumboreal, south at high elevations in the mountains to California and Arizona
Habitat: Uncommon in high mountain meadows
Origin: Native
Small-leaf pussytoes (Antennaria microphylla)
Distribution: Alaska to California, east to North Dakota and Arizona, from lower montane to sub-alpine.
Habitat: Moist, open areas, flood plains of streams, margins of alkali depressions.
Origin: Native
Tall pussytoes (Antennaria anaphaloides)
Distribution: Chiefly east of the Cascades, British Columbia to Oregon, east to Montana and Colorado.
Habitat: Hillsides and open woods at moderate elevations in the mountains, occasionally on grassy foothills.
Origin: Native
Umber pussytoes (Antennaria umbrinella)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Uncommon in openings in the forest at moderate elevations.
Origin: Native
Whip pussytoes (Antennaria flagellaris)
Distribution: East of the Cascades in Washington and Oregon, east to Wyoming
Habitat: Shrub-steppe to dry, open areas at mid-elevations, often in lithosol
Origin: Native
Woodrush pussytoes (Antennaria luzuloides)
Distribution: British Columbia south to California, east to Colorado and South Dakota.
Habitat: Open, moderately dry areas from foothills to mid-elevations in the mountains.
Origin: Native
Woolly pussytoes (Antennaria lanata)
Distribution: Both sides of the Cascades in Washington; British Columbia south to Oregon, east to Alberta and Wyoming.
Habitat: Mountain meadows near timberline.
Origin: Native
Pygmyflower (Androsace septentrionalis)
Distribution: Northern Washington; circumpolar in the arctic, widespread in Canada, pacific coast of the United States east to Dakotas, Minnesota, and Texas.
Habitat: Alpine meadows.
Origin: Native
Spreading pygmyleaf (Loeflingia squarrosa)
Origin: Native
Smooth-seed pygmyweed (Crassula solieri)
Origin: Native
Wrinkle-seed pygmyweed (Crassula aquatica)
Distribution: Occurring in scattered localities across Washington; Alaska south to California, east to the Rocky Mountains, and in the southeastern and northeastern regions of North America.
Habitat: Mud flats and vernal pools.
Origin: Native
One-sided pyrola (Orthilia secunda)
Distribution: Alaska to California, east to New Mexico in the west, and across the northern half of the United States to the Atlantic
Habitat: Common in coniferous woods at moderate to mid-elevationn in the mountains
Origin: Native