Vascular Plants

Includes all flowering plants, conifers, ferns and fern-allies.

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Common names beginning with P:
374 common names
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Index to common names:
paint, paintbrush, paiuteweed, pampas grass, panicgrass, panicum, pansy, paradise plant, parnassus, parsely, parsley-piert, parsnip, partridgefoot, pasqueflower, pathfinder, pea, peach, pear, pearleaf, pearlflower, pearlwort, peas, peashrub, peavine, pectocarya, pellitory, pellitory-of-the-wall, penny, pennycress, pennyroyal, penstemon, peony, pepper, peppergrass, peppermint, pepperweed, pepperwort, periwinkle, phacelia, pheasant's-eye, phlox, Pickerel-weed, pigeonberry, piggyback-plant, pigweed, pillwort, pimpernel, pincushion, pincushion-plant, pine, pinedrops, pinefoot, pinegrass, pinesap, pink, pinkfairies, pint, Pipsissewa, pipsissewa, pitchfork, plagiobothrys, plainsmustard, plane-tree, plant, plantain, plectritis, plum, plumeless thistle, podfern, poison, poison hemlock, poison ivy, poison-oak, pokeberry, pokeweed, polemonium, polypody, pondweed, poplar, poppy, poque, potato, povertyweed, prairie coneflower, prairie star, prairie-clover, prairie-crocus, pricklegrass, prickly-pear, primrose, primrose-willow, prince's-pine, princess tree, privet, professor-weed, puccoon, puddingberry, puffs, puncturebract, purples, purslane, pussypaws, pussytoes, pygmyflower, pygmyleaf, pygmyweed, pyrola
Indian paint (Blitum capitatum)
Distribution: In scattered locations in Washington, chiefly east of the Cascades crest; Alaska south to California, east to the Atlantic Coast primarily in the northern half of North America.
Habitat: Weedy native of low to moderate elevations.
Origin: Native
Flowers: June-August
Annual paintbrush (Castilleja minor)
Distribution: Central Washington and eastern Oregon to southern Montana, south to Arizona.
Habitat: Alkaline marshes and meadows, mostly at low elevations.
Origin: Native
Flowers: Late June - September
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
Flowers: April-June
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
Flowers: June-July
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
Flowers: June-August
Coast paintbrush (Castilleja litoralis)
Origin: Native
Common paintbrush (Castilleja miniata)
Distribution: Occurring throughout much of Washington; Alaska south to California, east to the Rocky Mountains in the U.S., east to Ontario in Canada.
Habitat: Mountain meadows and slopes; also on coastal bluffs; widespread and common.
Origin: Native
Flowers: May-September
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
Flowers: April-August
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
Flowers: June-July
Elmer's paintbrush (Castilleja elmeri)
Distribution: Occurring east of the Cascades crest in Washington from the Wenatchee Mountains and northward; south-central British Columbia to Kittitas County in Washington.
Habitat: Moist, open slopes at middle elevations to the subalpine.
Origin: Native
Flowers: June-August
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
Flowers: April-September
Harsh paintbrush (Castilleja hispida)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to southwestern Alberta and Montana.
Habitat: Grassy slopes and forest openings, from sea level to moderate elevations in the mountains
Origin: Native
Flowers: April-August
Obscure paintbrush (Castilleja cryptantha)
Distribution: Endemic to Mt. Rainier National Park and immediate vicinity, Washington.
Habitat: Moist subalpine meadows.
Origin: Native
Flowers: July-August
Pacific paintbrush (Castilleja litoralis)
Origin: Native
Scarlet paintbrush (Castilleja miniata)
Distribution: Occurring throughout much of Washington; Alaska south to California, east to the Rocky Mountains in the U.S., east to Ontario in Canada.
Habitat: Mountain meadows and slopes; also on coastal bluffs; widespread and common.
Origin: Native
Flowers: May-September
Small-flowered paintbrush (Castilleja parviflora)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to Alberta.
Habitat: Subalpine meadows and forest openings at high elevations.
Origin: Native
Flowers: June-September
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
Flowers: June-September
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
Flowers: May-August
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
Flowers: May-September
Victoria's paintbrush (Castilleja victoriae)
Distribution: San Juan Islands in WA; Victoria, B.C.
Habitat: Seasonally moist balds.
Origin: Native
Flowers: May-June
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
Flowers: May-August
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
Flowers: June-August
Purple pampas grass (Cortaderia jubata)
Distribution: Occurring in lowland western Washington; Washington to California.
Habitat: Disturbed, open areas at low elevation
Origin: Introduced from northern South America
Flowers: June-September
Hairy perennial panicgrass (Dichanthelium acuminatum)
Distribution: Southern British Columbia south along the coast to California; east of the Cascades mainly along water courses or around springs in the mountains, east to Montana and Wyoming.
Habitat: Rocky or sandy river banks or lake margins to open woods, marshy areas or dry prairies, from sea level to high elevation in the mountains.
Origin: Native
Flowers: June-August
Scribner's perennial panicgrass (Dichanthelium oligosanthes)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south on both sides of the Cascades to northern California, east to Idaho, Montana and Utah, also in eastern North America.
Habitat: Dry prairies or rocky areas to sandy stream banks.
Origin: Native
Flowers: May-July
Fall panicum (Panicum dichotomiflorum)
Distribution: Native in most of central and eastern United States; occasionally introduced in Washington.
Habitat: Waste ground.
Origin: Introduced
Flowers: May - September
Desert pansy (Viola trinervata)
Distribution: Occurring east of the Cascades crest in Washington; north-central Washington to southeastern Oregon.
Habitat: Sagebrush flats and rocky hillsides, often on lithosol, where vernally moist.
Origin: Native
Flowers: March-June
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
Flowers: March-June
Paradise plant (Daphne mezereum)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; southern British Columbia to Washington, east to northern Idaho and western Montana, also in northeastern North America.
Habitat: Wetlands, forest edges, and fields, where escaped from cultivation.
Origin: Introduced from Europe
Flowers: March-May
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
Flowers: July-September
Parsely (Petroselinum crispum)
Distribution: Occurring in scattered locations west of the Cascades crest in Washington at low elevations, where escaping from nearby cultivation; Washington to California, east in scattered locations across the U.S. to the Atlantic Coast.
Habitat: Roadsides, balds, fields, ditches, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced from Europe
Flowers: May-July
Field parsley-piert (Aphanes arvensis)
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; southern British Columbia to California, reported in Idaho, also along Atlantic Coast in the U.S.
Habitat: Ledges, often limy, sandy shores, hot springs, and other disturbed open ground at low elevations.
Origin: Introduced from Eurasia and northern Africa
Flowers: April-May
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
Flowers: March-May
Western parsley-piert (Aphanes occidentalis)
Distribution: Occurring west of the Cascades crest in lowland western Washington and east in the Columbia River Gorge; southern British Columbia to California.
Habitat: Vernally damp grasslands, balds, fields, ledges, rocky slopes, open forest, shores, and beaches at low elevations.
Origin: Native
Flowers: April-June
Common parsnip (Pastinaca sativa)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed sites at low elevations.
Origin: Introduced from Europe
Flowers: May-July
Water parsnip (Sium suave)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Swampy places and shallow water of lakes, ponds, and backwater channels, from low to middle elevations.
Origin: Native
Flowers: July-August
Wild parsnip (Pastinaca sativa)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed sites at low elevations.
Origin: Introduced from Europe
Flowers: May-July
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
Flowers: June-August
Mountain pasqueflower (Anemone occidentalis)
Distribution: Occurring in the Olympic and Cascade mountains in Washington; British Columbia to California, east to Alberta, Montana, Idaho, and the Wallowa Mountains of Oregon.
Habitat: Open slopes and meadows from middle elevations to the alpine.
Origin: Native
Flowers: May-August
Pasqueflower (Anemone patens)
Distribution: Occurring east of the Cascades crest in the Wenatchee Mountains in Washington, where disjunct from the main species range Alaska, south in the Rocky Mountains to New Mexico, east to the northern Great Plains and the Great Lakes region, disjunct in the Wenatchee Mountains in Washington.
Habitat: Prairies to mountain slopes, mostly on well-drained soil.
Origin: Native
Flowers: May-August
Western pasqueflower (Anemone occidentalis)
Distribution: Occurring in the Olympic and Cascade mountains in Washington; British Columbia to California, east to Alberta, Montana, Idaho, and the Wallowa Mountains of Oregon.
Habitat: Open slopes and meadows from middle elevations to the alpine.
Origin: Native
Flowers: May-August
Pathfinder (Adenocaulon bicolor)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east the northern Rocky Mountains, northern Great Plains, and Great Lakes region.
Habitat: Moist, shady woods at low to middle elevations.
Origin: Native
Flowers: June-September
Beach pea (Lathyrus japonicus)
Distribution: Occurring along the Puget Sound and outer coast in Washington; Alaska to California; also along the Atlantic Coast.
Habitat: Sandy beaches, dunes, and headlands along the coast.
Origin: Native
Flowers: May-September
Garden pea (Pisum sativum)
Distribution: Occurring in scattered locations across Washington; British Columbia to California, east across America in scattered locations.
Habitat: Roadsides, fields, wastelots, and other disturbed areas where escaped from cultivation.
Origin: Introduced
Flowers: May-September
Tuberous pea (Lathyrus tuberosus)
Distribution: Known from Okanogan County in Washington; Washington and Montana, also in eastern North America.
Origin: Introduced from Eurasia
Flowers: May-July
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
Flowers: April-May
Common pear (Pyrus communis)
Origin: Introduced
Snow pear (Pyrus nivalis)
Origin: Introduced
Pearleaf (Leptarrhena pyrolifolia)
Distribution: Occurring on both sides of the Cascades crest in Washington, including the Olympic Mountains; Alaska to Oregon, east to Northwest Territory, Alberta, and Montana.
Habitat: Streambanks, seeps and wet meadows, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Western pearlflower (Heterocodon rariflorus)
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
Flowers: June-August
Alpine pearlwort (Sagina saginoides)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska 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 middle elevations to the alpine.
Origin: Native
Flowers: May-September.
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
Flowers: May-June
Arctic pearlwort (Sagina saginoides)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska 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 middle elevations to the alpine.
Origin: Native
Flowers: May-September.
Bird-eye pearlwort (Sagina procumbens)
Distribution: Occurring on both sides of the Cascades crest in Washington, though more common west of the crest; Alaska to California, east to the Rocky Mountains, Great Lakes region, and northeastern North America.
Habitat: Moist areas, often where disturbed, at low elevations; common garden weed.
Origin: Introduced from Europe
Flowers: May-October
Stick-stemmed pearlwort (Sagina maxima)
Distribution: Occurring in counties along the coast in Washington; distinctly coastal, Alaska south to Monterey County, California.
Habitat: Moist sand or rocks.
Origin: Native
Flowers: June-September
Western pearlwort (Sagina decumbens)
Distribution: Chiefly west of the Cascades in Washington; British Columbia south to southern California.
Habitat: Moist soil at low elevations, but not typically coastal.
Origin: Native
Flowers: May-August
Tufted vetch (Vicia cracca)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, in scattered locations elsewhere in North America.
Habitat: Roadsides, fields, meadows, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: May-July
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 from Eurasia
Flowers: April-June
Angled peavine (Lathyrus angulatus)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: May-June
Beach peavine (Lathyrus littoralis)
Distribution: Occurring in the coastal counties in Washington; British Columbia to California.
Habitat: Sand dunes and sandy beaches.
Origin: Native
Flowers: May-July
Cream-flowered peavine (Lathyrus ochroleucus)
Distribution: Occurring east of the Cascades crest along the northern border of Washington; Alaska to Washington, east across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Moist woods, at the edge of thickets.
Origin: Native
Flowers: May-July
Earth-nut peavine (Lathyrus tuberosus)
Distribution: Known from Okanogan County in Washington; Washington and Montana, also in eastern North America.
Origin: Introduced from Eurasia
Flowers: May-July
Everlasting peavine (Lathyrus latifolius)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, ditches, forest edge, and other disturbed areas, usually where somewhat moist.
Origin: Introduced from Europe
Flowers: May-August
Few-flowered peavine (Lathyrus pauciflorus)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington to California, east to Idaho and Arizona.
Habitat: Shrub-steppe to Ponderosa pine and higher open forests.
Origin: Native
Flowers: April-June
Grass peavine (Lathyrus sphaericus)
Distribution: Occurring along the southern border of Washington; British Columbia to California.
Habitat: Fields, roadsides, ditches, and other disturbed open areas.
Origin: Introduced
Flowers: May-June
Leafy peavine (Lathyrus polyphyllus)
Distribution: Occurring west of the Cascades crest in lowland Washington, and east up the Columbia River Gorge; Washington to California.
Habitat: Prairies and open areas of low mountains.
Origin: Native
Flowers: May-July
Marsh peavine (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
Flowers: April-July
Narrow-leaf peavine (Lathyrus sylvestris)
Distribution: Occurring chiefly west of the Cascades in Washington; British Columbia to Oregon, east to the Rocky Mountains, also in eastern North America
Habitat: Roadsides and waste places at low elevations.
Origin: Introduced from Europe
Flowers: May-July
Nevada peavine (Lathyrus lanszwertii)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Montana and Utah.
Habitat: Sagebrush-ponderosa pine woodland to moderate elevations in the mountains.
Origin: Native
Flowers: May-June
Pacific peavine (Lathyrus vestitus)
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Moist woodlands, open slopes, and roadsides.
Origin: Native
Flowers: April-June
Perennial peavine (Lathyrus latifolius)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, ditches, forest edge, and other disturbed areas, usually where somewhat moist.
Origin: Introduced from Europe
Flowers: May-August
Sierra peavine (Lathyrus nevadensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho.
Habitat: Open woods at low to moderate elevations.
Origin: Native
Flowers: May-July
Thick-leaved peavine (Lathyrus lanszwertii)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Montana and Utah.
Habitat: Sagebrush-ponderosa pine woodland to moderate elevations in the mountains.
Origin: Native
Flowers: May-June
Torrey's peavine (Lathyrus torreyi)
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Open prairies and clearings in the woods at low elevations.
Origin: Native
Flowers: May-July
Winged pectocarya (Pectocarya penicillata)
Distribution: Occurring east of the Cascades crest in Washington; 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
Flowers: April-June
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
Flowers: May-September
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
Flowers: June-August
Fendler's pennycress (Noccaea fendleri)
Distribution: Occurring in the mountains throughout Washington; British Columbia south to California, east to Montana and New Mexico.
Habitat: Common in open, rocky areas at mid-elevations in the mountains.
Origin: Native
Flowers: May-August
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
Flowers: April-August
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
Flowers: March-May
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
Flowers: July-October
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
Flowers: May-August
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
Flowers: May-August
Bush penstemon (Penstemon fruticosus)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to Oregon, east to Montana and Wyoming.
Habitat: Common in rocky, open or wooded areas, foothills to rather high elevations in the mountains.
Origin: Native
Flowers: May-August
Coast penstemon (Penstemon serrulatus)
Distribution: Occurring on both sides of the Cascades crest and in the Olympic Mountains in Washington; southern British Columbia to Oregon.
Habitat: Moist to wet meadows and forest openings, from low elevations to the subalpine.
Origin: Native
Flowers: June-August
Crested tongue penstemon (Penstemon eriantherus)
Distribution: Occurring east of the Cascades crest chiefly in central and northeastern Washington; Southeast British Columbia to Oregon, east to the northern Great Plains.
Habitat: Dry, open places in the valleys, plains and foothills, sometimes ascending to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Davidson's penstemon (Penstemon davidsonii)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California and Nevada.
Habitat: Open, rocky areas, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Fuzzy penstemon (Penstemon eriantherus)
Distribution: Occurring east of the Cascades crest chiefly in central and northeastern Washington; Southeast British Columbia to Oregon, east to the northern Great Plains.
Habitat: Dry, open places in the valleys, plains and foothills, sometimes ascending to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Gairdner's penstemon (Penstemon gairdneri)
Distribution: East of the Cascades in Washington; Washington south to Oregon, east to Idaho.
Habitat: Dry, open sagebrush desert and scablands, low to moderate elevations in the mountains.
Origin: Native
Flowers: May-June
Glandular penstemon (Penstemon glandulosus)
Distribution: Along the east base of the Cascades, Chelan to Klickitat Counties, Washington, and at scattered locations in Oregon and Idaho.
Habitat: Open, often rocky hillsides and banks in the foothills, valleys, and lower mountains.
Origin: Native
Flowers: May-July
Hot-rock penstemon (Penstemon deustus)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana and Utah.
Habitat: Dry sites at moderate to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Lowly penstemon (Penstemon humilis)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to the Rocky Mountains.
Habitat: Dry, open, often rocky places, frequently with sagebrush, from the plains and foothills to high elevations in the mountains.
Origin: Native
Flowers: May-July
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 southwestern United States
Flowers: May-July
Richardson's penstemon (Penstemon richardsonii)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to north-central and northeast Oregon.
Habitat: Cliff crevices and other dry, rocky places at low to moderate elevations.
Origin: Native
Flowers: June-August
Rock penstemon (Penstemon rupicola)
Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California.
Habitat: Rock cliffs and rocky slopes from middle elevations in the mountains to the alpine.
Origin: Native
Flowers: May-August
Sand dune penstemon (Penstemon acuminatus)
Distribution: Occurring from Chelan and Douglas counties south along the Columbia River to Klickitat County; central Washington to north-central Oregon, also from southeastern Oregon to northern Nevada, east to southwestern Idaho.
Habitat: Dry, open, sandy places at low elevations.
Origin: Native
Flowers: April-June
Sharp-leaved penstemon (Penstemon acuminatus)
Distribution: Occurring from Chelan and Douglas counties south along the Columbia River to Klickitat County; central Washington to north-central Oregon, also from southeastern Oregon to northern Nevada, east to southwestern Idaho.
Habitat: Dry, open, sandy places at low elevations.
Origin: Native
Flowers: April-June
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
Flowers: May-July
Shrubby penstemon (Penstemon fruticosus)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to Oregon, east to Montana and Wyoming.
Habitat: Common in rocky, open or wooded areas, foothills to rather high elevations in the mountains.
Origin: Native
Flowers: May-August
Small-flowered penstemon (Penstemon procerus)
Distribution: Widely distributed throughout Washington; Alaska south to California, east to North Dakota, Wyoming and Colorado.
Habitat: Moist forest openings at moderate elevations to rocky slopes at high elevations.
Origin: Native
Flowers: June-August
Sulphur penstemon (Penstemon attenuatus)
Distribution: Occurring east of the Cascades crest in Washington; southeastern British Columbia to northeastern Oregon, east to western Montana and Wyoming.
Habitat: Dry to moist meadows and woodland slopes from the lowlands to the subalpine.
Origin: Native
Flowers: June-August
Taper-leaved penstemon (Penstemon attenuatus)
Distribution: Occurring east of the Cascades crest in Washington; southeastern British Columbia to northeastern Oregon, east to western Montana and Wyoming.
Habitat: Dry to moist meadows and woodland slopes from the lowlands to the subalpine.
Origin: Native
Flowers: June-August
Brown's peony (Paeonia brownii)
Distribution: Occurring east of the Cascades crest in Washington; central Washington to California, east to Montana and Utah.
Habitat: Sagebrush deserts to ponderosa pine forest opening and edges.
Origin: Native
Flowers: April-June
Western peony (Paeonia brownii)
Distribution: Occurring east of the Cascades crest in Washington; central Washington to California, east to Montana and Utah.
Habitat: Sagebrush deserts to ponderosa pine forest opening and edges.
Origin: Native
Flowers: April-June
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
Flowers: July-September
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
Flowers: April-May
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
Flowers: June-August
Broad-leaved peppergrass (Lepidium latifolium)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Great Plains and eastern North America.
Habitat: Disturbed, moist areas, irrigated land, stream banks, and drier upland areas.
Origin: Introduced from Eurasia
Flowers: June-September
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
Flowers: March-June
Common peppergrass (Lepidium densiflorum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
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
Flowers: June-August
Elongate peppergrass (Lepidium densiflorum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
Hairy-fruited peppergrass (Lepidium densiflorum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
Large-fruited peppergrass (Lepidium densiflorum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
Peppergrass (Lepidium latifolium)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Great Plains and eastern North America.
Habitat: Disturbed, moist areas, irrigated land, stream banks, and drier upland areas.
Origin: Introduced from Eurasia
Flowers: June-September
Prairie peppergrass (Lepidium densiflorum)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
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
Flowers: March-June
Shining peppergrass (Lepidium nitidum)
Distribution: Known from Klickitat County in Washington; Washington south to California.
Habitat: Dry, open areas at low elevation.
Origin: Native
Flowers: March-April
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
Flowers: April-May
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
Flowers: March-June
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
Flowers: July-September
Purple-anther pepperweed (Lepidium heterophyllum)
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, also in scattered locations in the eastern U.S.
Habitat: Roadsides, fields, meadows, pastures, wastelots, and other disturbed ground.
Origin: Introduced from Europe
Flowers: May-June
Smith's pepperweed (Lepidium heterophyllum)
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, also in scattered locations in the eastern U.S.
Habitat: Roadsides, fields, meadows, pastures, wastelots, and other disturbed ground.
Origin: Introduced from Europe
Flowers: May-June
Tall pepperweed (Lepidium virginicum)
Distribution: Throughout the United States, north to Alaska
Habitat: Weedy native of the lowlands
Origin: Native
Flowers: March - June
Broad-leaved pepperwort (Lepidium latifolium)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Great Plains and eastern North America.
Habitat: Disturbed, moist areas, irrigated land, stream banks, and drier upland areas.
Origin: Introduced from Eurasia
Flowers: June-September
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
Flowers: March-June
Field peppergrass pepperwort (Lepidium campestre)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, river and stream banks, wastelots, and other distrubed open, often dry soils.
Origin: Introduced from Eurasia
Flowers: May-July
Forked pepperwort (Lepidium oxycarpum)
Distribution: Chiefly in south-central California, rare in the Pacific Northwest.
Habitat: Usually on saline soil.
Origin: Native
Flowers: March - May
Garden cress pepperwort (Lepidium sativum)
Origin: Introduced from western Asia
Flowers: April - June
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
Flowers: April-August
Nelson's pepperwort (Marsilea oligospora)
Origin: Native
Pepperwort (Lepidium campestre)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, river and stream banks, wastelots, and other distrubed open, often dry soils.
Origin: Introduced from Eurasia
Flowers: May-July
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
Flowers: March-June
Pepperwort (Lepidium sativum)
Origin: Introduced from western Asia
Flowers: April - June
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
Spores: Spores produced April-October
Sharpfruited pepperwort (Lepidium oxycarpum)
Distribution: Chiefly in south-central California, rare in the Pacific Northwest.
Habitat: Usually on saline soil.
Origin: Native
Flowers: March - May
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
Spores: Spores produced April-October
Greater periwinkle (Vinca major)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California, east to Idaho, Utah, and Arizona,
Habitat: Disturbed forest understory and edge, roadsides, wastelots, and other disturbed areas at low elevations.
Origin: Introduced from Europe
Flowers: June-August
Lesser periwinkle (Vinca minor)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to Oregon, also in Montana, and east across the Great Plains to eastern North America.
Habitat: Disturbed forest understory and edge, roadsides, wastelots, and other disturbed areas at low elevations.
Origin: Introduced from Europe
Flowers: March-May
Bolander's phacelia (Phacelia bolanderi)
Distribution: Occurring west of the Cascades crest in lowland southwestern Washington; Coos Bay, Oregon south along the coast to Sonoma County, California.
Habitat: Mostly on open, often unstable slopes at low elevations.
Origin: Native
Flowers: June-July
Branched phacelia (Phacelia ramosissima)
Distribution: Occurring east of the Cascades crest in Washington; south-central British Columbia to California, east to southwestern Idaho and Arizona.
Habitat: Dry, open places in the plains and foothills, commonly on basaltic talus, ledges and cliffs.
Origin: Native
Flowers: May-August
Dwarf phacelia (Phacelia tetramera)
Distribution: Occurring east of the Cascades crest in central Washington; central Washington to California, east to Idaho, Wyoming and Utah.
Habitat: Alkaline flats and washes at low to middle elevations.
Origin: Native
Flowers: May-June
Least phacelia (Phacelia minutissima)
Distribution: Occurring east of the Cascades crest in Kittitas County in Washington; central Washington to northeastern Nevada, east to Idaho.
Habitat: Meadows and forest openings at middle elevations in the mountains.
Origin: Native
Flowers: June-July
Low phacelia (Phacelia humilis)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Nevada.
Habitat: Moist to moderately dry soil at low to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Shade phacelia (Phacelia nemoralis)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California.
Habitat: Thickets and woodlands, usually in fairly dry and shady areas, at low elevations.
Origin: Native
Flowers: April-July
Silky phacelia (Phacelia sericea)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Open, often rocky areas, from middle elevations in the mountains to the alpine.
Origin: Native
Flowers: June-August
Silverleaf phacelia (Phacelia hastata)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the northern Great Plains.
Habitat: Dry, open, often sandy areas, low to high elevations.
Origin: Native
Flowers: May-August
Sticky phacelia (Phacelia glandulifera)
Distribution: Occurring east of the Cascades crest in central Washington; Washington to California, east to Idaho, Nevada, Utah, and Wyoming.
Habitat: Open areas in sagebrush desert.
Origin: Native
Flowers: June
Thread-leaf phacelia (Phacelia linearis)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Common in dry, open places in the foothills and plains to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
Whiteleaf phacelia (Phacelia hastata)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the northern Great Plains.
Habitat: Dry, open, often sandy areas, low to high elevations.
Origin: Native
Flowers: May-August
Woodland phacelia (Phacelia nemoralis)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California.
Habitat: Thickets and woodlands, usually in fairly dry and shady areas, at low elevations.
Origin: Native
Flowers: April-July
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
Flowers: June
Clumped phlox (Phlox caespitosa)
Distribution: Occurring east of the Cascades crest in Washington; south-central British Columbia to south-central Washington, east to Idaho and Montana.
Habitat: Primarily in and near Ponderosa pine forest.
Origin: Native
Flowers: April-June
Clustered phlox (Phlox caespitosa)
Distribution: Occurring east of the Cascades crest in Washington; south-central British Columbia to south-central Washington, east to Idaho and Montana.
Habitat: Primarily in and near Ponderosa pine forest.
Origin: Native
Flowers: April-June
Henderson's phlox (Phlox hendersonii)
Distribution: In Washington known from the Olympic Mountains and central Cascades east of the crest; Washington south to Oregon.
Habitat: Open, often rocky areas, mid- to high elevations in the mountains.
Origin: Native
Flowers: July-August
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
Flowers: April-June
Long-leaf phlox (Phlox longifolia)
Distribution: Widely distributed east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Sagebrush desert to ponderosa pine forest openings, from low to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Many-flowered phlox (Phlox multiflora)
Distribution: Occurring east of the Cascades crest in the southeastern counties in Washington; southeastern Washington to northwestern Nevada, east to the Rocky Mountains.
Habitat: Ponderosa pine forest openings and open meadows from middle elevations to the subalpine.
Origin: Native
Flowers: May-July
Prickly phlox (Linanthus pungens)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Baja California, east to the Rocky Mountains.
Habitat: Dry, open, sandy or rocky places, from sagebrush desert and plains to moderate elevations in the drier mountains.
Origin: Native
Flowers: May-July
Showy phlox (Phlox speciosa)
Distribution: Widely distributed east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Shrub-steppe, often with sagebrush, and in ponderosa pine forest openings.
Origin: Native
Flowers: April-June
Slender phlox (Microsteris gracilis)
Distribution: Occurring on both sides of the Cascades crest in Washington, though more common east of the crest; Alaska to California, east to the Rocky Mountains and Great Plains.
Habitat: Lowlands and foothills in open, dry to moderately moist places.
Origin: Native
Flowers: March-June
Snake River phlox (Phlox colubrina)
Distribution: Occurring east of the Cascades crest in the southeastern counties in Washington; southeastern Washington to adjacent northeastern Oregon and western Idaho.
Habitat: Dry, open slopes and cliffs.
Origin: Native
Flowers: April-June
Spreading phlox (Phlox diffusa)
Distribution: Widely distributed throughout most of Washington; British Columbia south to California, east to the Rocky Mountains and into the Great Plains in the north.
Habitat: Open, often rocky areas, mid- to high elevations in the mountains.
Origin: Native
Flowers: May-August
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
Flowers: April-June
Stiff phlox (Phlox caespitosa)
Distribution: Occurring east of the Cascades crest in Washington; south-central British Columbia to south-central Washington, east to Idaho and Montana.
Habitat: Primarily in and near Ponderosa pine forest.
Origin: Native
Flowers: April-June
Tufted phlox (Phlox caespitosa)
Distribution: Occurring east of the Cascades crest in Washington; south-central British Columbia to south-central Washington, east to Idaho and Montana.
Habitat: Primarily in and near Ponderosa pine forest.
Origin: Native
Flowers: April-June
Yeti phlox (Phlox solivaga)
Distribution: Occurring east of the Cascades crest, where endemic to the southeastern counties in Washington.
Habitat: Windswept, rocky soil of montane to subalpine ridgelines.
Origin: Native
Flowers: May-July
Pickerel-weed (Pontederia cordata)
Origin: Introduced
Pigeonberry (Phytolacca americana)
Distribution: A few scattered locations across Washington.
Habitat: Roadsides, pastures, clearings, disturbed areas.
Origin: Introduced
Flowers: June-August
Piggyback-plant (Tolmiea menziesii)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California.
Habitat: Moist woods and stream banks, from low to middle elevations in the mountains.
Origin: Native
Flowers: May-August
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
Flowers: July - September
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
Flowers: June-September
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
Flowers: June - September
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
Flowers: July-October
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
Flowers: July-October
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
Flowers: July - September
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
Flowers: June-September
Winged pigweed (Cycloloma atriplicifolium)
Origin: Introduced
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
Flowers: May-October
Scarlet pimpernel (Lysimachia 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
Flowers: May-June
Water pimpernel (Samolus parviflorus)
Distribution: Occurring west of the Cascades crest along the Lower Columbia River in southwestern Washington; southwestern Washington to adjacent northwestern Oregon, otherwise in California, east across the southern U.S. to eastern North America.
Habitat: Freshwater intertidal zone.
Origin: Native
Flowers: July-September
Thompson's pincushion (Chaenactis thompsonii)
Distribution: Occurring east of the Cascades crest in Washington, where endemic to the Wenatchee Mountains.
Habitat: Open, usually rocky areas, at middle elevations.
Origin: Native
Flowers: June-August
Alva Day's pincushion-plant (Navarretia sinistra)
Distribution: Occurring east of the Cascades crest in central Washington; north-central Washington to California, east to southern Idaho, Utah, and Colorado.
Habitat: Meadows and open or lightly wooded slopes, from the foothills to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Marigold pincushion-plant (Navarretia tagetina)
Distribution: Klickitat County, Washington, south to California.
Habitat: Dry, open places at low elevations.
Origin: Native
Flowers: May - June
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
Flowers: May - July
Bull pine (Pinus ponderosa)
Distribution: Occurring mostly east of the Cascades crest in Washington; British Columbia to Baja California, east to the Great Plains.
Habitat: Mostly dry areas in open forests at low to middle elevations.
Origin: Native
Cones: May-June
Lodgepole pine (Pinus contorta)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and South Dakota.
Habitat: Dry montane forests, rocky balds, coastal bluffs and sand dunes, and sphagnum bogs.
Origin: Native
Cones: April-June
Ponderosa pine (Pinus ponderosa)
Distribution: Occurring mostly east of the Cascades crest in Washington; British Columbia to Baja California, east to the Great Plains.
Habitat: Mostly dry areas in open forests at low to middle elevations.
Origin: Native
Cones: May-June
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
Cones: May - June
Western yellow pine (Pinus ponderosa)
Distribution: Occurring mostly east of the Cascades crest in Washington; British Columbia to Baja California, east to the Great Plains.
Habitat: Mostly dry areas in open forests at low to middle elevations.
Origin: Native
Cones: May-June
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
Cones: June-July
Woodland pinedrops (Pterospora andromedea)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Great Plains and northeastern North America
Habitat: Common in coniferous forests, especially where ponderosa is dominant.
Origin: Native
Flowers: June-August
California pinefoot (Pityopus californicus)
Origin: Native
Flowers: June - July
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
Flowers: Late June - August
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
Flowers: June-August
Deptford pink (Dianthus armeria)
Distribution: Introduced in most of the United States
Habitat: Escaped from gardens
Origin: Introduced from Europe
Flowers: June - August
Maiden pink (Dianthus deltoides)
Origin: Introduced from Europe
Flowers: April - July
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
Flowers: May-June
Large cuckoo pint (Arum italicum)
Distribution: Known from lowlands west of Cascades crest in Washington; southwestern British Columbia to California; scattered location in central and eastern U.S.
Habitat: Forest understory and disturbed locations near urbanized areas.
Origin: Introduced from Europe
Flowers: April-June
Common Pipsissewa (Chimaphila umbellata)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern North America.
Habitat: Wooded areas, mostly coniferous forest, low to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Little pipsissewa (Chimaphila menziesii)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana and Utah.
Habitat: Coniferous forests from low to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Devil's pitchfork (Bidens frondosa)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Shores of ponds, lakes, backwater channels, and other wetland areas at low elevations, often where disturbed.
Origin: Native
Flowers: June-October
Fragrant plagiobothrys (Plagiobothrys figuratus)
Distribution: Occurring chiefly west of the Cascades and in the Columbia River Gorge in Washington; British Columbia south to Oregon.
Habitat: Nonalkaline meadows, low ground, and moist fields.
Origin: Native
Flowers: May-July
Harsh plagiobothrys (Plagiobothrys hispidulus)
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
Flowers: April-June
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
Flowers: April-June
American plane-tree (Platanus occidentalis)
Distribution: Occurring along the shores of the Columbia River in central and south-central Washington; common and native in central and eastern North America.
Habitat: Near streams, lakes, and moist ravines, often where disturbed.
Origin: Introduced
Flowers: April-May
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
Flowers: April-May
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 southeast Europe
Flowers: March-June
Monument plant (Frasera speciosa)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington to California, east to the Great Plains.
Habitat: Slopes, forest openings, and meadows from middle elevations to the subalpine.
Origin: Native
Flowers: June-August
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
Flowers: April-August
White-topped pitcher plant (Sarracenia leucophylla)
Origin: Introduced from southeast United States
Yellow pitcher plant (Sarracenia flava)
Distribution: Native in southeastern United States; introduced in western Washington.
Habitat: Swamps, bogs and seeps.
Origin: Introduced from southeast United States
Flowers: May - June
Alaska plantain (Plantago macrocarpa)
Distribution: Occurring along the outer coast in Washington; Alaska south to Oregon.
Habitat: Coastal wetlands.
Origin: Native
Flowers: May-June
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
Flowers: May-October
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
Flowers: April-August
Dwarf plantain (Plantago pusilla)
Origin: Introduced from eastern North America
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
Flowers: April-August
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
Flowers: April-August
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
Flowers: May-September
Sand plantain (Plantago arenaria)
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
Flowers: June-October
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
Flowers: May-July
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
Flowers: May-July
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
Flowers: April-June
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
Flowers: May-September
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
Flowers: April-June
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
Flowers: March-June
Long-spurred plectritis (Plectritis ciliosa)
Distribution: Klickitat County, Washington, south through western Oregon to California.
Habitat: Vernally moist, open slopes and meadows.
Origin: Native
Flowers: April - May
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 balds, prairies, meadows and slopes, from sea level to middle elevations in the mountains.
Origin: Native
Flowers: April-June
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
Flowers: April-June
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
Flowers: March-June
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
Flowers: April - May
Cherry plum (Prunus cerasifera)
Distribution: Introduced and escaped, mostly in Western Washington, but also in southeast Washington.
Habitat: Open, disturbed areas.
Origin: Introduced
Flowers: March-April
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
Flowers: March-May
Indian plum (Oemleria cerasiformis)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California.
Habitat: Moist to dry, open forest, forest edge, and stream bank thickets at low elevation.
Origin: Native
Flowers: February-April
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
Flowers: April - May
Italian plumeless thistle (Carduus pycnocephalus)
Distribution: Occurring west of the Cascades crest in Washington, where known only from Clallam County; Washington to California and Idaho, also in central and eastern U.S.
Habitat: Disturbed, open areas at low elevation.
Origin: Introduced from Europe
Flowers: June-July
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 setigerus)
Origin: Native
Poison hemlock (Conium maculatum)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas, often where soil is moist.
Origin: Introduced; native to Europe
Flowers: April-August
Western poison ivy (Toxicodendron radicans)
Distribution: Occurring east of the Cascades crest in Washington; throughout much of North America, except Alaska, California, southeastern U.S. and northeastern Canada.
Habitat: Generally in the lowlands and foothills and into the lower mountains in open areas or forest edges.
Origin: Native
Flowers: April-July
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
Flowers: April-July
Pokeberry (Phytolacca americana)
Distribution: A few scattered locations across Washington.
Habitat: Roadsides, pastures, clearings, disturbed areas.
Origin: Introduced
Flowers: June-August
Pokeweed (Phytolacca americana)
Distribution: A few scattered locations across Washington.
Habitat: Roadsides, pastures, clearings, disturbed areas.
Origin: Introduced
Flowers: June-August
Annual polemonium (Polemonium micranthum)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Common is open plains and foothills, often with sagebrush.
Origin: Native
Flowers: March-May
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
Flowers: July-September
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
Flowers: May - July
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
Flowers: May - July
Showy polemonium (Polemonium pulcherrimum)
Distribution: Widely distributed in Washington; Alaska south to the Sierra Nevada of California, east to Wyoming.
Habitat: High elevations in the mountains, often in open areas above timberline.
Origin: Native
Flowers: May-August
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
Flowers: July-September
Washington polemonium (Polemonium pectinatum)
Distribution: Known only from North Whitman County and south Spokane County, Washington.
Habitat: Moist bottom lands.
Origin: Native
Flowers: May-June
Western polemonium (Polemonium occidentale)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to Montana and Colorado.
Habitat: Very wet places at mid-elevations in the mountains.
Origin: Native
Flowers: June-August
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
Berchtold's pondweed (Potamogeton berchtoldii)
Origin: Native
Flowers: Late June - August
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
Flowers: June - August
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
Flowers: June - August
Curly pondweed (Potamogeton crispus)
Distribution: Widely dsitributed on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Slow-moving rivers and streams, lakes, ponds, and backwater channels, generally at low elevations.
Origin: Introduced from Eurasia
Flowers: June-August
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
Flowers: July - August
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
Flowers: July-September
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
Flowers: August - September
Fibrous-stipuled pondweed (Potamogeton fibrillosus)
Origin: Native
Flowers: June - August
Flat-stalked pondweed (Potamogeton friesii)
Origin: Native
Flowers: July - August
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
Flowers: July - August
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
Flowers: May - August
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
Flowers: May - August
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
Flowers: June - August
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
Flowers: June-August
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
Flowers: May-August
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
Flowers: June - August
Leafy pondweed (Potamogeton foliosus)
Distribution: British Columbia to Newfoundland, south on both sides of the Cascades to Mexico.
Habitat: Standing to moving, shallow water.
Origin: Native
Flowers: Late June - August
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
Flowers: June - August
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
Flowers: June - August
Narrowleaf pondweed (Potamogeton strictifolius)
Origin: Native
Northern pondweed (Potamogeton alpinus)
Origin: Native
Flowers: June - August
Reddish pondweed (Potamogeton alpinus)
Origin: Native
Flowers: June - August
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
Flowers: June - July
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
Flowers: June - August
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
Flowers: August - September
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
Flowers: July-September
Slender-leaved pondweed (Stuckenia filiformis)
Distribution: Only known from Whatcom County in Washington; Alaska south to California, east to the Rocky Mountains; east across Canada to the Atlantic Coast and Greenland.
Habitat: Lakes, ponds, slow moving waters.
Origin: Native
Flowers: June-August
Small pondweed (Potamogeton pusillus)
Distribution: British Columbia south on both sides of the Cascades to California, east to the Atlantic.
Habitat: Shallow ponds and streams.
Origin: Native
Flowers: July - August
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
Flowers: June - August
Western pondweed (Stuckenia filiformis)
Distribution: Only known from Whatcom County in Washington; Alaska south to California, east to the Rocky Mountains; east across Canada to the Atlantic Coast and Greenland.
Habitat: Lakes, ponds, slow moving waters.
Origin: Native
Flowers: June-August
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
Flowers: May - July
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
Flowers: May - July
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
Flowers: March-May
California poppy (Eschscholzia californica)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California, east to Idaho, Arizona and New Mexico.
Habitat: Roadsides, fields, ditches, balds, prairies, parks, wastelots, and other disturbed, open areas at low elevations.
Origin: Introduced from Oregon
Flowers: May-September
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
Flowers: June - July
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
Flowers: May - June
Opium poppy (Papaver somniferum)
Distribution: Introduced and often escaping from cultivation, persisting for a short time.
Habitat: Waste areas, roadsides.
Origin: Introduced from Eurasia
Flowers: June - July
Poque (Kopsiopsis hookeri)
Distribution: Occurring west of the Cascades crest along the Puget Sound and outer coast in Washington; British Columbia 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
Flowers: May-July
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
Flowers: July-September
Irish potato (Solanum tuberosum)
Origin: Introduced from Europe
Nuttall's povertyweed (Blitum nuttallianum)
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
Flowers: May - July
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
Flowers: May-June
Upright prairie coneflower (Ratibida columnifera)
Distribution: Southeast British Columbia and Montana, east to Minnesota and south to Texas.
Habitat: Prairies, plains and waste ground.
Origin: Introduced
Flowers: June-August
Bulbiferous prairie star (Lithophragma glabrum)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Grasslands and sagebrush desert to ponderosa pine and Douglas-fir forest openings.
Origin: Native
Flowers: April-June
Slender prairie star (Lithophragma tenellum)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Sagebrush desert and ponderosa pine forests openings.
Origin: Native
Flowers: April-June
Small-flowered prairie star (Lithophragma parviflorum)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Great Plains.
Habitat: Prairies, balds, sagebrush desert, and forest openings, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-June
Blue Mountain prairie-clover (Dalea ornata)
Distribution: Occurring east of the Cascades crest in central and southeastern Washington\' Washington to California, east to Idaho and Nevada.
Habitat: Dry, rocky or sandy areas, often in sagebrush, low to moderate elevations.
Origin: Native
Flowers: May-July
Prairie-crocus (Anemone patens)
Distribution: Occurring east of the Cascades crest in the Wenatchee Mountains in Washington, where disjunct from the main species range Alaska, south in the Rocky Mountains to New Mexico, east to the northern Great Plains and the Great Lakes region, disjunct in the Wenatchee Mountains in Washington.
Habitat: Prairies to mountain slopes, mostly on well-drained soil.
Origin: Native
Flowers: May-August
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
Flowers: April-July
Modest pricklegrass (Crypsis vaginiflora)
Origin: Introduced from the western Mediterranean
Brittle prickly-pear (Opuntia fragilis)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east the Rocky Mountains, Great Plains, and Great Lakes region.
Habitat: Dry, open, often sandy soil.
Origin: Native
Flowers: May-July
Columbia prickly-pear (Opuntia columbiana)
Distribution: Occurring east of the Cascades crest in Washington; south-central British Columbia to eastern Oregon, east to western and southern Idaho.
Habitat: From sagebrush plains and foothills to lower elevations in the mountains.
Origin: Native
Flowers: May-July
Little prickly-pear (Opuntia fragilis)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east the Rocky Mountains, Great Plains, and Great Lakes region.
Habitat: Dry, open, often sandy soil.
Origin: Native
Flowers: May-July
Common evening primrose (Oenothera biennis)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Meadows and stream banks, from the plains to the lower mountains, typically where disturbed.
Origin: Introduced from Europe
Flowers: June-August
Hooker's evening primrose (Oenothera elata)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington south to California, east to the Rocky Mountains and southern Great Plains in the U.S.
Habitat: Sagebrush hills to mid elevations in the mountains, generally where moist.
Origin: Native
Flowers: June-September
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
Flowers: April-July
Long-tubed evening primrose (Oenothera flava)
Distribution: Known historically in Washington from south-central part of the state; Saskatchewan to Mexico, west to Idaho and California.
Habitat: Hard-packed soil in swales or around vernal pools in the plains and lower foothills.
Origin: Native
Flowers: July-August
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
Flowers: April-June
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
Flowers: June - August
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
Flowers: June-August
Floating primrose-willow (Ludwigia peploides)
Distribution: Documented west of the Cascades crest in King County in Washington; central Oregon to California, east across the southwestern U.S. and southern Great Plains to eastern North America.
Habitat: Noxious; ponds, slow streams, and sloughs.
Origin: Introduced
Flowers: June-September
Marsh primrose-willow (Ludwigia palustris)
Distribution: Occurring west of the Cascades crest and along the Columbia River in Washington; southern British Columbia to California, east to Idaho, east across the southwestern U.S. and southern Great Plains to eastern North America; also occurring in New World Tropics and Eurasia.
Habitat: Lakes, marshes, peatlands, shores, and wet meadows.
Origin: Native
Flowers: July-September
Little prince's-pine (Chimaphila menziesii)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana and Utah.
Habitat: Coniferous forests from low to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Prince's-pine (Chimaphila umbellata)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern North America.
Habitat: Wooded areas, mostly coniferous forest, low to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Princess tree (Paulownia tomentosa)
Distribution: Known from King and Skamania counties in Washington; occurring from the Great Lakes region south to Texas, east to the Atlantic Coast.
Habitat: Disturbed, open areas often relatively close to sites where trees are being cultivated.
Origin: Introduced
Flowers: May-June
California privet (Ligustrum ovalifolium)
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
Flowers: April-May
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; noxious.
Origin: Introduced from Eurasia
Flowers: May-July
Columbian puccoon (Lithospermum ruderale)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to the Sasketchewan and the Rocky Mountains.
Habitat: Sagebrush desert to ponderosa pine forest openings, from low to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Puddingberry (Cornus canadensis)
Distribution: Occurring east of the Cascades crest in northeastern Washington; northeastern Washington to the Great Lakes region and northeastern North America; Greenland.
Habitat: Moist forest understory.
Origin: Native
Flowers: May-July
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
Flowers: March-May
Treelike puncturebract (Oxytheca dendroidea)
Origin: Native
Flowers: June - August
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
Flowers: July-September
Common purslane (Portulaca oleracea)
Distribution: Introduced from southern Europe and widely distributed in the United States.
Habitat: Gardens, disturbed soil
Origin: Introduced from Europe
Flowers: June - Frost
Sea purslane (Honckenya peploides)
Distribution: Occuring west of the Cascades crest in the coastal counties in Washington; Alaska to northern Oregon, east across Canada to coastal northeastern North America; Greenland and arctic Eurasia.
Habitat: Coastal beaches, strands, and sand dunes.
Origin: Native
Flowers: May-September
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
Flowers: June-August
Rosy pussypaws (Calyptridium roseum)
Distribution: Occurring east of the Cascades crest in Benton County, Washington, where disjunct from the main range of the species; central Oregon to California, east to southern Idaho and Utah; disjunct in south-central Washington.
Habitat: Sagebrush desert to montane forest openings.
Origin: Native
Flowers: May-July
Alpine pussytoes (Antennaria alpina)
Distribution: Occurring in the North Cascades Mountains in Washington; Alaska to Washington, Montana, and Wyoming, east across Canada; circumboreal.
Habitat: Alpine meadows.
Origin: Native
Flowers: July-September
Alpine pussytoes (Antennaria media)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains; circumboreal
Habitat: On rocky slopes and ridges, and in talus and pumice, from subalpine to alpine meadows.
Origin: Native
Flowers: June-September
Brown-bract pussytoes (Antennaria umbrinella)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Saskatchewan, Montana, Wyoming, and Colorado.
Habitat: Forest openings at middle elevations to subalpine meadows.
Origin: Native
Flowers: May-August
Cushion pussytoes (Antennaria dimorpha)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Nebraska.
Habitat: Dry, open places in sagebrush desert to ponderosa pine forest openings, often on lithosol.
Origin: Native
Flowers: April-May
Flat topped pussytoes (Antennaria corymbosa)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Rocky Mountains.
Habitat: Streamsides, willow thickets and moist meadows in subalpine and alpine areas.
Origin: Native
Flowers: June-August
Geyer's pussytoes (Antennaria geyeri)
Distribution: Occurring east of the Cascades crest in southern Washington; southern Washington to California, east to Nevada.
Habitat: Rocky slopes with ash, sand, or pumice soils, lithosols, and open forest.
Origin: Native
Flowers: June-July
Hooker's pussytoes (Antennaria racemosa)
Distribution: Widely distributed in mountainous areas on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, and Wyoming.
Habitat: Dry to damp rocky slopes, forest openings, and ledges from low to middle elevations in the mountains.
Origin: Native
Flowers: May-August
Howell's pussytoes (Antennaria howellii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Rocky or sandy slopes, dry to moist grasslands, and forest openings at low to middle elevations.
Origin: Native
Flowers: May-July
Little-leaf pussytoes (Antennaria microphylla)
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common east of the crest; Alaska to California, east to the Rocky Mountains and northern Great Plains, Great Lakes region, and eastern Canada.
Habitat: Dry to moist habitats, including meadows, ponderosa pine forest openings, rocky slopes, and floodplains from the lowlands to the alpine.
Origin: Native
Flowers: June-August
Little-leaf pussytoes (Antennaria parvifolia)
Distribution: Occurring east of the Cascades crest in northeastern Washington; British Columbia to Oregon, east to the Rocky Mountains, Great Plains, and Great Lakes region.
Habitat: Meadows, open forest, gravelly slopes, and sandy flats from the lowlands middle elevations in the mountains.
Origin: Native
Flowers: May-July
Low pussytoes (Antennaria dimorpha)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Nebraska.
Habitat: Dry, open places in sagebrush desert to ponderosa pine forest openings, often on lithosol.
Origin: Native
Flowers: April-May
Meadow pussytoes (Antennaria corymbosa)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Rocky Mountains.
Habitat: Streamsides, willow thickets and moist meadows in subalpine and alpine areas.
Origin: Native
Flowers: June-August
Narrowleaved pussytoes (Antennaria stenophylla)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Nevada, east to central Idaho.
Habitat: Rocky slopes, flats, lithosol areas, and dry grasslands in sagebrush desert.
Origin: Native
Flowers: April-June
Nuttall's pussytoes (Antennaria parvifolia)
Distribution: Occurring east of the Cascades crest in northeastern Washington; British Columbia to Oregon, east to the Rocky Mountains, Great Plains, and Great Lakes region.
Habitat: Meadows, open forest, gravelly slopes, and sandy flats from the lowlands middle elevations in the mountains.
Origin: Native
Flowers: May-July
Pinewoods pussytoes (Antennaria geyeri)
Distribution: Occurring east of the Cascades crest in southern Washington; southern Washington to California, east to Nevada.
Habitat: Rocky slopes with ash, sand, or pumice soils, lithosols, and open forest.
Origin: Native
Flowers: June-July
Pygmy pussytoes (Antennaria monocephala)
Distribution: Reported from the North Cascades in Washington; Alaska to British Columbia, east to Alberta, Montana, and Wyoming; also in the Russian Far East.
Habitat: Alpine meadows, ridges, and rocky outcroppings.
Origin: Native
Flowers: July-September
Raceme pussytoes (Antennaria racemosa)
Distribution: Widely distributed in mountainous areas on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, and Wyoming.
Habitat: Dry to damp rocky slopes, forest openings, and ledges from low to middle elevations in the mountains.
Origin: Native
Flowers: May-August
Rocky Mountain pussytoes (Antennaria media)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains; circumboreal
Habitat: On rocky slopes and ridges, and in talus and pumice, from subalpine to alpine meadows.
Origin: Native
Flowers: June-September
Rosy pussytoes (Antennaria microphylla)
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common east of the crest; Alaska to California, east to the Rocky Mountains and northern Great Plains, Great Lakes region, and eastern Canada.
Habitat: Dry to moist habitats, including meadows, ponderosa pine forest openings, rocky slopes, and floodplains from the lowlands to the alpine.
Origin: Native
Flowers: June-August
Showy pussytoes (Antennaria pulcherrima)
Distribution: Occurring east of the Cascades crest in Washington; Alaska to Washington, east to the Rocky Mountains, east across Canada to the Atlantic Coast.
Habitat: Streams, wet thickets and meadows, and peatlands from middle elevations to the alpine.
Origin: Native
Flowers: May-August
Silvery-brown pussytoes (Antennaria luzuloides)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and South Dakota.
Habitat: Sagebrush grasslands at low elevations to dry, rocky slopes at middle elevations in the mountains.
Origin: Native
Flowers: May-July
Single-headed pussytoes (Antennaria monocephala)
Distribution: Reported from the North Cascades in Washington; Alaska to British Columbia, east to Alberta, Montana, and Wyoming; also in the Russian Far East.
Habitat: Alpine meadows, ridges, and rocky outcroppings.
Origin: Native
Flowers: July-September
Stoloniferous pussytoes (Antennaria flagellaris)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Idaho, Wyoming, South Dakota, and Nevada.
Habitat: Sagebrush desert to dry, open areas at middle elevations, often in lithosol.
Origin: Native
Flowers: April-July
Tall pussytoes (Antennaria anaphaloides)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia, including southern Vancouver Island, to Oregon, east to Sasketchewan, Montana, Colorado, and Nevada.
Habitat: Grassy hillsides, open woodlands, and ponderosa pine forest openings from the foothills to middle elevations in the mountains.
Origin: Native
Flowers: June-July
Umber pussytoes (Antennaria umbrinella)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Saskatchewan, Montana, Wyoming, and Colorado.
Habitat: Forest openings at middle elevations to subalpine meadows.
Origin: Native
Flowers: May-August
Whip pussytoes (Antennaria flagellaris)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Idaho, Wyoming, South Dakota, and Nevada.
Habitat: Sagebrush desert to dry, open areas at middle elevations, often in lithosol.
Origin: Native
Flowers: April-July
White pussytoes (Antennaria microphylla)
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common east of the crest; Alaska to California, east to the Rocky Mountains and northern Great Plains, Great Lakes region, and eastern Canada.
Habitat: Dry to moist habitats, including meadows, ponderosa pine forest openings, rocky slopes, and floodplains from the lowlands to the alpine.
Origin: Native
Flowers: June-August
Woodrush pussytoes (Antennaria luzuloides)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and South Dakota.
Habitat: Sagebrush grasslands at low elevations to dry, rocky slopes at middle elevations in the mountains.
Origin: Native
Flowers: May-July
Woolly pussytoes (Antennaria lanata)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Wyoming, and Utah.
Habitat: Dry or moist subalpine to alpine meadows, rocky slopes, and ridges.
Origin: Native
Flowers: July-September
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
Flowers: May-August
Spreading pygmyleaf (Loeflingia squarrosa)
Distribution: Occurring east of the Cascades crest in Washington, where disjunct in Benton County. southeastern Oregon to California, east to the southern Rocky Mountains and southern Great Plains.
Habitat: Dry, sandy, or gravelly desert areas.
Origin: Native
Flowers: May-June
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
Flowers: April-August
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
Flowers: June - August
Toothleaf pyrola (Pyrola dentata)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana and Wyoming.
Habitat: Montane coniferous forest understory.
Origin: Native
Flowers: June-August
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