Vascular Plants

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

Browse by common name:
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Common names beginning with P:
Indian paint (Blitum capitatum)
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast primarily in the northern half of North America.
Habitat: Open areas at low to middle elevations.
Origin: Native
Flowers: June-August
Growth Duration: Annual
Annual paintbrush (Castilleja minor)
Distribution: Occurring east of the Cascades crest in Washington; south-central British Columbia to California, east to the Rocky Mountains.
Habitat: Alkaline marshes and meadows, mostly at low elevations.
Origin: Native
Flowers: June-September
Growth Duration: Annual, Biennial
Attenuate paintbrush (Castilleja attenuata)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California and Arizona.
Habitat: Drier areas at low elevations.
Origin: Native
Flowers: April-June
Growth Duration: Annual
Chambers's Indian paintbrush (Castilleja chambersii)
Distribution: Occurring west of the Cascades crest in Washington in Pacific County; southwestern Washington to northwestern Washington.
Habitat: Forest openings, embankments, and rock outcroppings typically where moist.
Origin: Native
Flowers: June-July
Growth Duration: Perennial
Cliff paintbrush (Castilleja rupicola)
Distribution: Occurring chiefly west of the Cascades crest in Washington; southern British Columbia to Oregon.
Habitat: Rock crevices and rocky slopes, usually above timberline.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Coast paintbrush (Castilleja litoralis)
Distribution: Occurring west of the Cascades crest in southwestern Washington; southwestern Washington to California.
Habitat: Seaside bluffs, coastal scrub, dune swales, possibly parasitic on Gaultheria shallon.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Common paintbrush (Castilleja miniata)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and Great Lakes region.
Habitat: Mountain meadows and slopes; also on coastal bluffs; widespread and common.
Origin: Native
Flowers: May-September
Growth Duration: Perennial
Cusick's paintbrush (Castilleja cusickii)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Nevada, east to Alberta, Montana, and Wyoming.
Habitat: Open areas, lower valleys to subalpine meadows.
Origin: Native
Flowers: April-August
Growth Duration: Perennial
Deer paintbrush (Castilleja cervina)
Distribution: Occurring east of the Cascades crest in northeastern Washington; British Columbia to Washington, east to northern Idaho, and possibly western Montana.
Habitat: Grasslands and woodlands at moderate to mid-elevations
Origin: Native
Flowers: June-July
Growth Duration: Perennial
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
Growth Duration: Perennial
Golden paintbrush (Castilleja levisecta)
Distribution: Occurring west of the Cascades crest in Washngton; Vancouver Island to the Willamette Valley of Oregon.
Habitat: Meadows and prairies at low elevations.
Origin: Native
Flowers: April-September
Growth Duration: Perennial
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
Growth Duration: Perennial
Obscure paintbrush (Castilleja cryptantha)
Distribution: Endemic to Mt. Rainier National Park and immediate vicinity in Washington.
Habitat: Moist subalpine meadows.
Origin: Native
Flowers: July-August
Growth Duration: Perennial
Pacific paintbrush (Castilleja litoralis)
Distribution: Occurring west of the Cascades crest in southwestern Washington; southwestern Washington to California.
Habitat: Seaside bluffs, coastal scrub, dune swales, possibly parasitic on Gaultheria shallon.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Scarlet paintbrush (Castilleja miniata)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and Great Lakes region.
Habitat: Mountain meadows and slopes; also on coastal bluffs; widespread and common.
Origin: Native
Flowers: May-September
Growth Duration: Perennial
Small-flowered paintbrush (Castilleja parviflora)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta.
Habitat: Subalpine meadows and forest openings at high elevations.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Suksdorf's paintbrush (Castilleja suksdorfii)
Distribution: Occurring on both sides of the Cascades crest from mainly from Mt. Adams south; In Washington chiefly in the Cascades from Mt. Adams south, occasionally north to Whatcom County; Washington to Crater Lake, Oregon.
Habitat: Subalpine meadows and forests along streams and wet areas.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Thin paintbrush (Castilleja tenuis)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Idaho and Nevada..
Habitat: Vernally moist meadows and other moist sites, from the lowlands to moderate elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Annual
Thompson's paintbrush (Castilleja thompsonii)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon.
Habitat: Dry sagebrush deserts to high mountain ridges.
Origin: Native
Flowers: May-September
Growth Duration: Perennial
Victoria's paintbrush (Castilleja victoriae)
Distribution: Occurring west of the Cascades crest in Washington in San Juan County; Victoria, British Columbia area to the San Juan Islands.
Habitat: Seasonally moist balds.
Origin: Native
Flowers: May-June
Growth Duration: Annual
Yellow paintbrush (Castilleja lutescens)
Distribution: Occurring east of the Cascades crest in eastern Washington; eastern Washington to northeastern Oregon, east to northwestern Montana.
Habitat: Low, dry grasslands and woodlands, occasionally to high elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Paiuteweed (Suaeda calceoliformis)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska 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
Growth Duration: Annual
Pampas grass (Cortaderia selloana)
Distribution: Occurring west of the Cascades crest in Washington; Washington to California, in scattered states eastward to Atlantic Coast.
Habitat: Disturbed, open soil of wastelots, abandoned fields, and roadsides at low elevations, often near coast.
Origin: Introduced from central South America
Flowers: May-July
Growth Duration: Perennial
Purple pampas grass (Cortaderia jubata)
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Disturbed, open areas at low elevation.
Origin: Introduced from northern South America
Flowers: June-September
Growth Duration: Perennial
Hairy perennial panicgrass (Dichanthelium acuminatum)
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: 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
Growth Duration: Perennial
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
Growth Duration: Perennial
Fall panicum (Panicum dichotomiflorum)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlanitc Coast.
Habitat: Disturbed, often wet sites including stream banks and roadsides.
Origin: Introduced from eastern and central Washington
Flowers: May-September
Growth Duration: Annual, Perennial
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
Growth Duration: Perennial
European field pansy (Viola arvensis)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas where escaping from cultivation.
Origin: Introduced from Europe
Flowers: March-June
Growth Duration: Annual
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
Growth Duration: Perennial
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
Growth Duration: Biennial
American parsley-fern (Cryptogramma acrostichoides)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Great Lakes region, Colorado, and New Mexico.
Habitat: Cliff crevices and talus slopes at mid- to high elevations in the mountains
Origin: Native
Growth Duration: Perennial
Cascades parsley-fern (Cryptogramma cascadensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho and Montana
Habitat: Cliff crevices and talus slopes at mid- to high elevations in the mountains, occasionally descending to sea level in humid areas.
Origin: Native
Spores: May-September
Growth Duration: Perennial
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
Growth Duration: Annual
Small-fruited parsley-piert (Aphanes australis)
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to northwestern Oregon, also in southeastern U.S.
Habitat: Openings, shores, lawns, and other disturbed areas at low elevations.
Origin: Introduced from Europe
Flowers: March-May
Growth Duration: Perennial
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
Growth Duration: Annual
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
Growth Duration: Biennial
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
Growth Duration: Perennial
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
Growth Duration: Biennial
Partridgefoot (Luetkea pectinata)
Distribution: Occurring in the Olympic and Cascades mountains in Washington; Alaska to California, east to Northwest Territory, Alberta, Idaho, and Montana.
Habitat: Usually on sandy soil in moist or shady places, subalpine to alpine.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Beach pea (Lathyrus japonicus)
Distribution: Occurring west of the Cascades crest 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
Growth Duration: Perennial
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
Growth Duration: Annual
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
Growth Duration: Perennial
Peach (Prunus persica)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; southwestern British Columbia to California, east to Idaho; also in eastern North America.
Habitat: Thickets, shores, and disturbed ground.
Origin: Introduced from eastern Asia
Flowers: April-June
Growth Duration: Perennial
Common pear (Pyrus communis)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho, Montana, Utah and New Mexico; also from southcentral U.S. east and northeast to the Atlantic Coast.
Habitat: Grasslands, thickets, shorelines, and forest openings;
Origin: Introduced from Eurasia
Flowers: April-June
Growth Duration: Perennial
Western pearlflower (Heterocodon rariflorus)
Distribution: Occurring chiefly east of the Cascades crest 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
Growth Duration: Annual
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.
Growth Duration: Biennial, Perennial
Annual pearlwort (Sagina apetala)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, also occurring in Kansas.
Habitat: Waste ground.
Origin: Introduced from Europe
Flowers: May-June
Growth Duration: Annual
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.
Growth Duration: Biennial, Perennial
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
Growth Duration: Perennial
Stick-stemmed pearlwort (Sagina maxima)
Distribution: Occurring west of the Cascades crest in Washington, often along or near the coast; Alaska to California.
Habitat: Moist sand or rocks.
Origin: Native
Flowers: June-September
Growth Duration: Annual, Perennial
Western pearlwort (Sagina decumbens)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California.
Habitat: Moist soil at low elevations, but not typically coastal.
Origin: Native
Flowers: May-August
Growth Duration: Annual
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Angled peavine (Lathyrus angulatus)
Distribution: Occurring in scattered locations on both sides 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
Growth Duration: Annual
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Grass peavine (Lathyrus sphaericus)
Distribution: Occurring chiefly west of the Cascades crest along the southern border of Washington; British Columbia to California.
Habitat: Fields, roadsides, ditches, and other disturbed open areas.
Origin: Introduced
Flowers: May-June
Growth Duration: Annual
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
Growth Duration: Perennial
Marsh peavine (Lathyrus palustris)
Distribution: Occurring west of the Cascades crest along the Puget Sound and outer coast in Washington; Alaska to California, also in the Great Lakes region.
Habitat: Chiefly in tidelands along the coast.
Origin: Native
Flowers: April-July
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Annual
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
Growth Duration: Perennial
Pellitory-of-the-wall (Parietaria judiaca)
Origin: Introduced from Africa and Eurasia
Growth Duration: Perennial
Tinker's penny (Hypericum anagalloides)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to Baja California, east to Montana, Utah, and Nevada.
Habitat: Moist ground, from the coast to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Fendler's pennycress (Noccaea fendleri)
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington to California, east to the Rocky Mountains and Texas.
Habitat: Common in open, rocky areas from middle elevations to the subalpine.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Field pennycress (Thlaspi arvense)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Weed of waste ground, low to moderate elevations.
Origin: Introduced from Eurasia
Flowers: April-August
Growth Duration: Annual
Pennyroyal (Mentha pulegium)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California; also scattered in eastern North America.
Habitat: Moist, disturbed areas.
Origin: Introduced from Europe
Flowers: July-October
Growth Duration: Perennial
Blue Mountain penstemon (Penstemon venustus)
Distribution: Occurring east of the Cascades crest in Washington, where introduced in central Washington and native to the Blue Mountains region in southeastern Washington; Washington to California, east to Idaho and Utah.
Habitat: Open, rocky slopes, from the foothills to moderate elevations in the mountains.
Origin: Native and Introduced
Flowers: May-August
Growth Duration: Perennial
Broad-leaved penstemon (Penstemon ovatus)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to Oregon.
Habitat: Open woods below 3000 feet in elevation.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Bush penstemon (Penstemon fruticosus)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to Oregon, east to Alberta, Montana and Wyoming.
Habitat: Common in rocky, open or wooded areas, foothills to rather high elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
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
Growth Duration: Perennial
Crested-tongue penstemon (Penstemon eriantherus)
Distribution: Occurring east of the Cascades crest chiefly in central and northeastern Washington; southeastern 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
Growth Duration: Perennial
Davidson's penstemon (Penstemon davidsonii)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California and Nevada.
Habitat: Open, rocky areas, from middle to high elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Fuzzy-tongue penstemon (Penstemon eriantherus)
Distribution: Occurring east of the Cascades crest chiefly in central and northeastern Washington; southeastern 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
Growth Duration: Perennial
Gairdner's penstemon (Penstemon gairdneri)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho.
Habitat: Dry, open sagebrush desert and scablands, low to moderate elevations in the mountains.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
Glandular penstemon (Penstemon glandulosus)
Distribution: Occurring east of the Cascades crest in Washington; central Washington to north-central Oregon, and from southeastern Washington to eastern Oregon, east to Idaho.
Habitat: Open, often rocky hillsides and banks in the foothills, valleys, and lower mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Hot-rock penstemon (Penstemon deustus)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana and Utah.
Habitat: Open rocky roadsides, hillsides, and rock outcrops, sometimes in dry meadows, lowland to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Lyall's penstemon (Penstemon lyallii)
Distribution: Reported from east of the Cascades crest in northeastern Washington, but no specimens seen; southeastern British Columbia to northeastern Washington, east to Alberta, northern Idaho, and western Montana.
Habitat: Rocky slopes, talus, and rock outcrops.
Origin: Native
Flowers: June-July
Growth Duration: Perennial
Richardson's penstemon (Penstemon richardsonii)
Distribution: Occurring chiefly 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
Growth Duration: Perennial
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
Growth Duration: Perennial
Sand dune penstemon (Penstemon acuminatus)
Distribution: Occurring east of the Cascades crest 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
Growth Duration: Perennial
Sharp-leaved penstemon (Penstemon acuminatus)
Distribution: Occurring east of the Cascades crest 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
Growth Duration: Perennial
Showy penstemon (Penstemon speciosus)
Distribution: Occurring east of the Cascades crest in Washington; Washington 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
Growth Duration: Perennial
Shrubby penstemon (Penstemon fruticosus)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to Oregon, east to Alberta, Montana and Wyoming.
Habitat: Common in rocky, open or wooded areas, foothills to rather high elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Small-flowered penstemon (Penstemon procerus)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Moist forest openings at moderate elevations to rocky slopes at high elevations.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Water pepper (Persicaria hydropiperoides)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia 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
Growth Duration: Perennial
Alkali peppergrass (Lepidium dictyotum)
Distribution: Occurring east of the Cascades crest in Washington; Washington 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
Growth Duration: Annual
Branched peppergrass (Lepidium ramosissimum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the northern Great Plains and northeastern North America.
Habitat: Sagebrush, ponderosa pine forest openings, roadsides, fields, and other disturbed open areas.
Origin: Native
Flowers: June-August
Growth Duration: Annual, Biennial, Perennial
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
Growth Duration: Perennial
Clasping-leaved peppergrass (Lepidium perfoliatum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Disturbed areas, such as overgrazed land and waste areas, usually where dry.
Origin: Introduced from Eurasia
Flowers: March-June
Growth Duration: Annual, Biennial
Common peppergrass (Lepidium densiflorum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
Growth Duration: Annual, Biennial
Elongate peppergrass (Lepidium densiflorum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
Growth Duration: Annual, Biennial
Field peppergrass (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
Growth Duration: Annual, Biennial
Hairy-fruited peppergrass (Lepidium densiflorum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
Growth Duration: Annual, Biennial
Large-fruited peppergrass (Lepidium densiflorum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
Growth Duration: Annual, Biennial
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
Growth Duration: Perennial
Prairie peppergrass (Lepidium densiflorum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
Growth Duration: Annual, Biennial
Round-leaved peppergrass (Lepidium perfoliatum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Disturbed areas, such as overgrazed land and waste areas, usually where dry.
Origin: Introduced from Eurasia
Flowers: March-June
Growth Duration: Annual, Biennial
Shining peppergrass (Lepidium nitidum)
Distribution: Known from Klickitat County in Washington; south-central Washington to California.
Habitat: Dry, open areas at low elevation.
Origin: Native
Flowers: March-April
Growth Duration: Annual
Upright peppergrass (Lepidium strictum)
Distribution: Occurring west of the Cascades crest in Washington; western Washington to southwestern Oregon.
Habitat: Disturbed ground at low elevations.
Origin: Introduced from Europe
Flowers: April-May
Growth Duration: Annual
Veiny peppergrass (Lepidium dictyotum)
Distribution: Occurring east of the Cascades crest in Washington; Washington 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
Growth Duration: Annual
Yellow-flowered peppergrass (Lepidium perfoliatum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Disturbed areas, such as overgrazed land and waste areas, usually where dry.
Origin: Introduced from Eurasia
Flowers: March-June
Growth Duration: Annual, Biennial
Peppermint (Mentha ×piperita)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho, further east across much of North America to the Atlantic Coast.
Habitat: Banks of streams and ditches, bottom lands and moist roadsides.
Origin: Introduced from Europe
Flowers: July-September
Growth Duration: Perennial
Oblong pepperweed (Lepidium oblongum)
Distribution: Occurring west of the Cascades crest in northwestern Washington, where possibly not fully naturalized; northwestern Washington and southwestern Oregon; native to the southern U.S. and Central America.
Habitat: Roadsides and wastelots.
Origin: Introduced from the southern U.S. and Central America
Flowers: May-July
Growth Duration: Annual
Purple-anther pepperweed (Lepidium heterophyllum)
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington; southwestern 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
Growth Duration: Perennial
Smith's pepperweed (Lepidium heterophyllum)
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington; southwestern 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
Growth Duration: Perennial
Tall pepperweed (Lepidium virginicum)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Beach strand, grassy balds, grasslands, and other open areas at low elevations.
Origin: Native
Flowers: March-June
Growth Duration: Annual
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
Growth Duration: Perennial
Forked pepperwort (Lepidium oxycarpum)
Distribution: Occurring west of the Cascades crest in the San Juan Islands; disjunct in southern Vancouver Island and adjacent San Juan Islands, otherwise occurring in central California.
Habitat: Vernal pools and saline soils.
Origin: Native
Flowers: March-May
Growth Duration: Annual
Hoary pepperwort (Lepidium draba)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, sagebrush desert, wastelots, and disturbed areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: April-August
Growth Duration: Perennial
Nelson's pepperwort (Marsilea oligospora)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Montana, Wyoming, and Utah.
Habitat: Ponds and marshes, in wet depressions in sagebrush and less commonly on river margins.
Origin: Native
Spores: June-October
Growth Duration: Perennial
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
Growth Duration: Annual, Biennial
Pepperwort (Marsilea vestita)
Distribution: Occurring chiefly east of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to the Great Plains and southeastern U.S.
Habitat: Ponds, vernal pools, and floodplains from low to middle elevations.
Origin: Native
Spores: April-October
Growth Duration: Perennial
Sharpfruited pepperwort (Lepidium oxycarpum)
Distribution: Occurring west of the Cascades crest in the San Juan Islands; disjunct in southern Vancouver Island and adjacent San Juan Islands, otherwise occurring in central California.
Habitat: Vernal pools and saline soils.
Origin: Native
Flowers: March-May
Growth Duration: Annual
Water-clover pepperwort (Marsilea vestita)
Distribution: Occurring chiefly east of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to the Great Plains and southeastern U.S.
Habitat: Ponds, vernal pools, and floodplains from low to middle elevations.
Origin: Native
Spores: April-October
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Annual
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
Growth Duration: Annual
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
Growth Duration: Annual
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
Growth Duration: Biennial, Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Annual
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
Growth Duration: Annual
Varileaf phacelia (Phacelia heterophylla)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Widespread in dry, open places from the foothills to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Biennial, Perennial
Virgate phacelia (Phacelia heterophylla)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Widespread in dry, open places from the foothills to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Biennial, Perennial
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
Growth Duration: Perennial
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
Growth Duration: Biennial, Perennial
Summer pheasant's-eye (Adonis aestivalis)
Distribution: Occurring east of the Cascades crest in Washington; central Washington to California, east to Montana, Idaho, and Utah.
Habitat: Disturbed areas.
Origin: Introduced from Europe
Flowers: May-July
Growth Duration: Annual
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Henderson's phlox (Phlox hendersonii)
Distribution: Occurring in the Olympic Mountains and in the Cascades east of the crest in Washington; Washington to Oregon.
Habitat: Open, often rocky areas, mid- to high elevations in the mountains.
Origin: Native
Flowers: July-August
Growth Duration: Perennial
Hood's phlox (Phlox hoodii)
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Dry, open places in the plains and foothills, often in lithosol, occasionally to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Annual
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
Growth Duration: Perennial
Spreading phlox (Phlox diffusa)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California.
Habitat: Open, often rocky areas, mid- to high elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Sticky phlox (Phlox viscida)
Distribution: Occurring east of the Cascades crest in southeastern Washington; southeastern Washington to northeastern Oregon, east to adjacent Idaho.
Habitat: Open areas in grasslands and ponderosa pine forest.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Pickerel-weed (Pontederia cordata)
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to Oregon; native to central and eastern and North America.
Habitat: Lakeshores and pond margins, where often escaping from cultivation.
Origin: Introduced from central and eastern North America
Flowers: July-September
Growth Duration: Perennial
Pickleweed (Salicornia pacifica)
Distribution: Occurring west of the Cascades crest along the coast in Washington; Alaska to Baja California.
Habitat: Salt marshes and beaches along coast.
Origin: Native
Flowers: June-October
Growth Duration: Perennial
Pigeonberry (Phytolacca americana)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, where introduced; native to central and eastern North America.
Habitat: Roadsides, pastures, clearings, disturbed areas.
Origin: Introduced from central and eastern North America
Flowers: June-August
Growth Duration: Perennial
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
Growth Duration: Perennial
Green pigweed (Amaranthus hybridus)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from eastern North America
Flowers: July-October
Growth Duration: Annual
Pigweed (Chenopodium album)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Fields, roadsides, forest edge, wastelots, and other disturbed areas.
Origin: Introduced from Europe, but some populations in the Midwest may be native to North America, according to FNA
Flowers: June-September
Growth Duration: Annual
Prostrate pigweed (Amaranthus blitoides)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast; cosmopolitan.
Habitat: Dry, disturbed areas
Origin: Introduced from central United States
Flowers: June - September
Growth Duration: Annual
Redroot pigweed (Amaranthus retroflexus)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from eastern and central North America
Flowers: July-October
Growth Duration: Annual
Rough pigweed (Amaranthus retroflexus)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from eastern and central North America
Flowers: July-October
Growth Duration: Annual
Smooth pigweed (Amaranthus hybridus)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from eastern North America
Flowers: July-October
Growth Duration: Annual
White pigweed (Amaranthus albus)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east across much of North America to the Atlantic Coast.
Habitat: Dry, disturbed areas.
Origin: Introduced from tropical America
Flowers: June-September
Growth Duration: Annual
American pillwort (Pilularia americana)
Distribution: Occurring east of the Cascades in far eastern Washington; disjunct in eastern Washington, otherwise Oregon to California, also in the central and southeastern U.S.
Habitat: Shallow ponds, vernal pools, and reservoir margins.
Origin: Native
Spores: June-October
Growth Duration: Perennial
False pimpernel (Lindernia dubia)
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: Disturbed, open soil, often where moist near ponds, lakes, and streams, from low to middle elevations.
Origin: Native
Flowers: May-October
Growth Duration: Annual
Scarlet pimpernel (Lysimachia arvensis)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east across much of North America to the Atlantic Coast.
Habitat: Roadsides, fields, wastelots, and other disturbed, open areas.
Origin: Introduced from Eurasia
Flowers: May-June
Growth Duration: Annual, Biennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Alva Day's pincushion-plant (Navarretia sinistra)
Distribution: Occurring east of the Cascades crest in central Washington; 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
Growth Duration: Annual
Divaricate pincushion-plant (Navarretia divaricata)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana and Nevada.
Habitat: Dry, open places from the foothills to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Annual
Marigold pincushion-plant (Navarretia tagetina)
Distribution: Occurring east of the Cascades crest in Washington in Klickitat County; south-central Washington to California.
Habitat: Dry, open places at low elevations.
Origin: Native
Flowers: May-June
Growth Duration: Annual
Mountain pincushion-plant (Navarretia divaricata)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana and Nevada.
Habitat: Dry, open places from the foothills to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Annual
Yellow pincushion-plant (Navarretia breweri)
Distribution: Occurring east of the Cascades crest in Washington; central Washington to California, east to Wyoming and Arizona.
Habitat: Dry, open areas and meadows, from the foothills to middle elevations in the mountains
Origin: Native
Flowers: May-July
Growth Duration: Annual
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Western white pine (Pinus monticola)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, and Nevada.
Habitat: Moist valleys and drier slopes, near sea level to mid-elevations in the mountains
Origin: Native
Cones: May-June (cones)
Growth Duration: Perennial
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
Growth Duration: Perennial
White-bark pine (Pinus albicaulis)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana and Wyoming.
Habitat: Generally near timberline, preferring south-facing slopes.
Origin: Native
Cones: June-July
Growth Duration: Perennial
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
Growth Duration: Perennial
California pinefoot (Pityopus californicus)
Origin: Native
Flowers: June - July
Growth Duration: Perennial
Pinegrass (Calamagrostis rubescens)
Distribution: Occurring east of the Cascades crest in Washington; 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: June-August
Growth Duration: Perennial
Fringed pinesap (Pleuricospora fimbriolata)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Washington to California.
Habitat: Uncommon in coniferous forests at mid-elevations.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Deptford pink (Dianthus armeria)
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, forest edge, wastelots, and other disturbed areas at low elevation.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Annual, Biennial
Maiden pink (Dianthus deltoides)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, east across Canada and from the midwestern U.S. to the Atlantic Coast.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: April-July
Growth Duration: Perennial
Windmill pink (Silene gallica)
Distribution: Occurring west of the Cascades crest in lowland western Washington; British Columbia to California, east to the Rocky Mountains; also in eastern North America.
Habitat: Weed of disturbed soil and wasteland.
Origin: Introduced from Europe
Flowers: May-July
Growth Duration: Annual
Pinkfairies (Clarkia pulchella)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to South Dakota.
Habitat: Dry, open slopes, low to middle elevations.
Origin: Native
Flowers: May-June
Growth Duration: Annual
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
Growth Duration: Perennial
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
Growth Duration: Perennial
White-topped pitcher plant (Sarracenia leucophylla)
Distribution: Occurring west of the Cascades crest in Washington; native to the southeastern United States.
Habitat: Swamps, bogs and seeps.
Origin: Introduced from southeast United States
Flowers: May-July
Growth Duration: Perennial
Purple pitcher-plant (Sarracenia purpurea)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to Washington; native to the Great Lakes region and eastern North America.
Habitat: Swamps, bogs and seeps.
Origin: Introduced from central and eastern North America
Flowers: May-July
Growth Duration: Perennial
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
Growth Duration: Annual
Flax-leaved plainsmustard (Sisymbrium linifolium)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Arizona (not including California), east to the Rocky Mountains.
Habitat: Sagebrush-steppe communities, rock crevices.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
Salmon River plainsmustard (Sisymbrium linifolium)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Arizona (not including California), east to the Rocky Mountains.
Habitat: Sagebrush-steppe communities, rock crevices.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
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
Growth Duration: Perennial
Gopher plant (Euphorbia lathyris)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California east to Idaho, Montana, Arizona, and Texas; widely distributed in eastern North America.
Habitat: Disturbed soil and wasteland.
Origin: Introduced from Eurasia
Flowers: April-May
Growth Duration: Annual
Money plant (Lunaria annua)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia 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
Growth Duration: Annual
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
Growth Duration: Perennial
Oyster plant (Tragopogon porrifolius)
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, fields and waste places, usually where moist.
Origin: Introduced from Europe
Flowers: April-August
Growth Duration: Biennial
Yellow pitcher plant (Sarracenia flava)
Distribution: Occurring west of the Cascades crest, where intentionally planted; native in the southeastern United States.
Habitat: Swamps, bogs and seeps.
Origin: Introduced from southeast United States
Flowers: May-June
Growth Duration: Perennial
Alaska plantain (Plantago macrocarpa)
Distribution: Occurring west of the Cascades crest along the outer coast in Washington; Alaska to Oregon.
Habitat: Coastal wetlands.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
Buck-horn plantain (Plantago coronopus)
Distribution: Occurring west of the Cascades crest along the coast in Washington; British Columbia to California; also in Manitoba, Texas, and northeastern U.S.
Habitat: Occasional at low elevations along the coast in sandy or disturbed areas.
Origin: Introduced from Eurasia and northern Africa
Flowers: May-October
Growth Duration: Annual, Biennial
Common plantain (Plantago major)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: April-August
Growth Duration: Perennial
English plantain (Plantago lanceolata)
Distribution: Occuring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast; cosmopolitan.
Habitat: Roadsides, fields, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: April-August
Growth Duration: Perennial
Great plantain (Plantago major)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: April-August
Growth Duration: Perennial
Large-fruited plantain (Plantago macrocarpa)
Distribution: Occurring west of the Cascades crest along the outer coast in Washington; Alaska to Oregon.
Habitat: Coastal wetlands.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
Mexican plantain (Plantago subnuda)
Distribution: Occurring west of the Cascades crest in coastal southwestern Washington; Washington to California.
Habitat: Tidal flats and coastal bluffs.
Origin: Native
Flowers: May-September
Growth Duration: Perennial
Sand plantain (Plantago arenaria)
Distribution: Occurring west of the Cascades crest in lowland southwestern Washington; British Columbia to California, also in Idaho and central and eastern North America.
Habitat: Sandy areas of roadsides, fields, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: June-October
Growth Duration: Annual
Sea plantain (Plantago maritima)
Distribution: Occurring west of the Cascades crest along the coast in Washington; British Columbia to California.
Habitat: Salt marshes, bluffs and cliffs along the coast.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Seaside plantain (Plantago maritima)
Distribution: Occurring west of the Cascades crest along the coast in Washington; British Columbia to California.
Habitat: Salt marshes, bluffs and cliffs along the coast.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Slender plantain (Plantago elongata)
Distribution: Occurring west of the Cascades crest along the coast of western Washington and in the Columbia River Gorge; British Columbia to California, east to Minnesota and Texas.
Habitat: Moist, somewhat saline areas.
Origin: Native
Flowers: April-June
Growth Duration: Annual
Tall coastal plantain (Plantago subnuda)
Distribution: Occurring west of the Cascades crest in coastal southwestern Washington; Washington to California.
Habitat: Tidal flats and coastal bluffs.
Origin: Native
Flowers: May-September
Growth Duration: Perennial
Woolly plantain (Plantago patagonica)
Distribution: Occurring chiefly east of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east across most of North America to the Atlantic Coast; also in South America.
Habitat: Dry, open places at low to middle elevations.
Origin: Native
Flowers: April-June
Growth Duration: Annual
Long-horn plectritis (Plectritis macrocera)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Vernally moist, open areas; common in shrub-steppe
Origin: Native
Flowers: March-June
Growth Duration: Annual
Long-spurred plectritis (Plectritis ciliosa)
Distribution: Occurring east of the Cascades crest in Klickitat County in Washington Klickitat County, Washington, and southwestern Oregon to California.
Habitat: Vernally moist, open slopes and meadows.
Origin: Native
Flowers: April-May
Growth Duration: Annual
Rosy plectritis (Plectritis congesta)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; southwestern British Columbia 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
Growth Duration: Annual
Shortspur white plectritis (Plectritis brachystemon)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; southern British Columbia to California.
Habitat: Coastal bluffs, lowland prairies, balds at low elevations in the mountains.
Origin: Native
Flowers: April-June
Growth Duration: Annual
White plectritis (Plectritis macrocera)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Vernally moist, open areas; common in shrub-steppe
Origin: Native
Flowers: March-June
Growth Duration: Annual
American plum (Prunus americana)
Distribution: Occurring east of the Cascades crest in southcentral and southeastern Washington; Washington to Oregon, east to the Rocky Mountains, and further east across North America to the Atlantic Coast.
Habitat: Along watercourses, and on open or wooded, moist or dry areas from the plains into the lower mountains.
Origin: Native and introduced from further east of Washington
Flowers: April-May
Growth Duration: Perennial
Cherry plum (Prunus cerasifera)
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington, but also in southeastern Washington; British Columbia to California, east to Idaho; also in northeastern North America.
Habitat: Open, disturbed areas typically at low elevations.
Origin: Introduced
Flowers: March-April
Growth Duration: Perennial
Cultivated plum (Prunus domestica)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Washington 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 from Eurasia
Flowers: March-May
Growth Duration: Perennial
Flowering plum (Prunus cerasifera)
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington, but also in southeastern Washington; British Columbia to California, east to Idaho; also in northeastern North America.
Habitat: Open, disturbed areas typically at low elevations.
Origin: Introduced
Flowers: March-April
Growth Duration: Perennial
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
Growth Duration: Perennial
Wild plum (Prunus americana)
Distribution: Occurring east of the Cascades crest in southcentral and southeastern Washington; Washington to Oregon, east to the Rocky Mountains, and further east across North America to the Atlantic Coast.
Habitat: Along watercourses, and on open or wooded, moist or dry areas from the plains into the lower mountains.
Origin: Native and introduced from further east of Washington
Flowers: April-May
Growth Duration: Perennial
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
Growth Duration: Annual
Podfern (Aspidotis densa)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho, Montana, South Dakota, western Wyoming, and northern Utah; disjunct in Quebec.
Habitat: Cliff crevices and moist, rocky slopes, foothills to near timberline, often on serpentine
Origin: Native
Growth Duration: Perennial
Fish poison (Croton setigerus)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Baja California, east to western Idaho and Nevada.
Habitat: Dry, often sandy or rocky areas.
Origin: Native
Flowers: June-August
Growth Duration: Annual
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 from Europe
Flowers: April-August
Growth Duration: Biennial
Western poison ivy (Toxicodendron radicans)
Distribution: Occurring east of the Cascades crest in Washington; occurring 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
Growth Duration: Perennial
Pacific poison-oak (Toxicodendron diversilobum)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to Nevada.
Habitat: Open woods at low elevations.
Origin: Native
Flowers: April-July
Growth Duration: Perennial
Pokeberry (Phytolacca americana)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, where introduced; native to central and eastern North America.
Habitat: Roadsides, pastures, clearings, disturbed areas.
Origin: Introduced from central and eastern North America
Flowers: June-August
Growth Duration: Perennial
Pokeweed (Phytolacca americana)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, where introduced; native to central and eastern North America.
Habitat: Roadsides, pastures, clearings, disturbed areas.
Origin: Introduced from central and eastern North America
Flowers: June-August
Growth Duration: Perennial
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
Growth Duration: Annual
Elegant polemonium (Polemonium elegans)
Distribution: Occurring in the Olympics and Cascades mountains in Washington; British Columbia to Washington.
Habitat: Open, often rocky areas, middle to high elevations in the mountains.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Great polemonium (Polemonium carneum)
Distribution: Occurring west of the Cascades crest on the Olympic Peninsula and southwestern Washington; Olympic Peninsula to California.
Habitat: Thickets, woodlands and forest openings, from near sea level to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Salmon polemonium (Polemonium carneum)
Distribution: Occurring west of the Cascades crest on the Olympic Peninsula and southwestern Washington; Olympic Peninsula to California.
Habitat: Thickets, woodlands and forest openings, from near sea level to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Showy polemonium (Polemonium pulcherrimum)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: High elevations in the mountains, often in open areas above timberline.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Sticky polemonium (Polemonium viscosum)
Distribution: Occurring east of the Cascades crest in Washington, where known only from Okanogan County. British Columbia 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
Growth Duration: Perennial
Washington polemonium (Polemonium pectinatum)
Distribution: Occurring east of the Cascades crest, where endemic to central and eastern Washington.
Habitat: Moist bottom lands in scabland habitat.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
Western polemonium (Polemonium occidentale)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Great Lakes region.
Habitat: Wet meadows and stream banks middle elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Irregular polypody (Polypodium amorphum)
Distribution: Occurring chiefly west of the Cascades crest in Washington; southern British Columbia to northern Oregon.
Habitat: Cliff crevices, mostly montane to subalpine.
Origin: Native
Spores: April-August
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Western polypody (Polypodium hesperium)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Moist cliffs, ledges and rock crevices, lowlands to middle elevations in the mountains
Origin: Native
Growth Duration: Perennial
Berchtold's pondweed (Potamogeton berchtoldii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
Habitat: Often in acidic waters, lakes, slow streams, sloughs, marshes.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Blunt-leaved pondweed (Potamogeton obtusifolius)
Distribution: Occurring west of the Cascades crest in Washington; Alaska to Washington, east across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Lakes, slow streams, and alkaline water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Broad-leaved pondweed (Potamogeton amplifolius)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Lakes and ponds, tolerant of deep waters.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Clasping-leaved pondweed (Potamogeton richardsonii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Standing or slow-moving water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
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
Growth Duration: Perennial
Eel-grass pondweed (Potamogeton zosteriformis)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia 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: June-August
Growth Duration: Perennial
Fennel-leaved pondweed (Stuckenia pectinata)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Shallow to deep, fresh to brackish water.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
Fern pondweed (Potamogeton robbinsii)
Distribution: Occurring on both sides of the Cascades crest in Washington; 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
Growth Duration: Perennial
Fibrous-stipuled pondweed (Potamogeton fibrillosus)
Distribution: Occurring west of the Cascades crest in Washington; Washington to California, east to Idaho, Wyoming, and Utah.
Habitat: Warm, shallow water, lakes, springs, streams.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Flat-stalked pondweed (Potamogeton friesii)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to Washington, east to Alberta, Idaho, Montana, Wyoming, and Utah, northern Great Plains, Great Lakes region, and eastern North America.
Habitat: Lakes, slow streams, and alkaline water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Flat-stem pondweed (Potamogeton zosteriformis)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia 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: June-August
Growth Duration: Perennial
Floating pondweed (Potamogeton natans)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, Great Plains, Great Lakes Region, and eastern North America.
Habitat: In rather shallow, standing water, often where brackish.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Floating-leaved pondweed (Potamogeton natans)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, Great Plains, Great Lakes Region, and eastern North America.
Habitat: In rather shallow, standing water, often where brackish.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Grassy pondweed (Potamogeton gramineus)
Distribution: Occurring 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: Standing or running water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Horned pondweed (Zannichellia palustris)
Distribution: Occurring on both sides of the Cascades crest in Washington Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Fresh to brackish, standing to slow-flowing water, sea level to moderate elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Illinois pondweed (Potamogeton illinoensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; Northwest Territories to California, east across much of North America to the Atlantic Coast.
Habitat: Ponds and lakes, usually in rather deep, quiet water.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Large-leaved pondweed (Potamogeton amplifolius)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Lakes and ponds, tolerant of deep waters.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Leafy pondweed (Potamogeton foliosus)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Standing to moving, shallow water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Loddon's pondweed (Potamogeton nodosus)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Mexico; east over most of the United States to the Atlantic Coast.
Habitat: Shallow to rather deep water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Long-leaved pondweed (Potamogeton nodosus)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Mexico; east over most of the United States to the Atlantic Coast.
Habitat: Shallow to rather deep water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Narrowleaf pondweed (Potamogeton strictifolius)
Distribution: Occurring east of the Cascades crest in Washington, where known only from Okanogan County; Yukon Territory to Washington, east across the northern U.S. and Canada to eastern North America.
Habitat: Alkaline water, lakes and slow streams.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
Northern pondweed (Potamogeton alpinus)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains; also in eastern North America.
Habitat: Calm water of lakes and slow streams.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Reddish pondweed (Potamogeton alpinus)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains; also in eastern North America.
Habitat: Calm water of lakes and slow streams.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Ribbon-leaved pondweed (Potamogeton epihydrus)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains; also in northeastern North America; Europe.
Habitat: Shallow to deep water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Richardson's pondweed (Potamogeton richardsonii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Standing or slow-moving water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Robbin's pondweed (Potamogeton robbinsii)
Distribution: Occurring on both sides of the Cascades crest in Washington; 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
Growth Duration: Perennial
Sago pondweed (Stuckenia pectinata)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Shallow to deep, fresh to brackish water.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Variable pondweed (Potamogeton gramineus)
Distribution: Occurring 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: Standing or running water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
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
Growth Duration: Perennial
White-stalked pondweed (Potamogeton praelongus)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, Great Plains, Great Lakes region, and eastern North America.
Habitat: Deep water of lakes.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Whitestem pondweed (Potamogeton praelongus)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, Great Plains, Great Lakes region, and eastern North America.
Habitat: Deep water of lakes.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Scouler's popcorn flower (Plagiobothrys scouleri)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Wisconsin and New Mexico.
Habitat: Moist areas, foothills to mid-elevations in the mountains, seldom in alkaline areas.
Origin: Native
Flowers: May-August
Growth Duration: Annual
Alkali popcorn-flower (Plagiobothrys leptocladus)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington to Baja California, east to the Rocky Mountains and northern Great Plains.
Habitat: Moist clay flats and beds of drying pools; tolerant of alkali.
Origin: Native
Flowers: April-July
Growth Duration: Annual
Cognate popcorn-flower (Plagiobothrys cognatus)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains.
Habitat: Wet areas in grasslands, sagebrush, and forest openings.
Origin: Native
Flowers: April-July
Growth Duration: Annual
Fragrant popcorn-flower (Plagiobothrys figuratus)
Distribution: Occurring chiefly west of the Cascades and in the Columbia River Gorge in Washington; British Columbia to Oregon.
Habitat: Nonalkaline meadows, low ground, and moist fields.
Origin: Native
Flowers: May-July
Growth Duration: Annual
Harsh popcorn-flower (Plagiobothrys hispidulus)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to Wyoming, Utah, and Nevada.
Habitat: Moist to dry open areas at low to middle elevations.
Origin: Native
Flowers: May-July
Growth Duration: Annual
Matted popcorn-flower (Plagiobothrys cusickii)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to Idaho and Nevada.
Habitat: Wet areas and mudflats in sagebrush, grassland, and forest openings.
Origin: Native
Flowers: May-July
Growth Duration: Annual
Pacific popcorn-flower (Plagiobothrys tenellus)
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to Baja California, east to Idaho and Nevada.
Habitat: Dry, open places at low elevations.
Origin: Native
Flowers: April-June
Growth Duration: Annual
Rusty popcorn-flower (Plagiobothrys nothofulvus)
Distribution: Common in the east end of the Columbia River Gorge in Washington; Oregon to northern Baja California, east to Nevada.
Habitat: Open slopes, fields and roadsides.
Origin: Native
Flowers: March-May
Growth Duration: Annual
Slender popcorn-flower (Plagiobothrys tenellus)
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to Baja California, east to Idaho and Nevada.
Habitat: Dry, open places at low elevations.
Origin: Native
Flowers: April-June
Growth Duration: Annual
Slender-branched popcorn-flower (Plagiobothrys leptocladus)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington to Baja California, east to the Rocky Mountains and northern Great Plains.
Habitat: Moist clay flats and beds of drying pools; tolerant of alkali.
Origin: Native
Flowers: April-July
Growth Duration: Annual
Gray poplar (Populus ×canescens)
Origin: Introduced from Europe
Growth Duration: Perennial
Lombardy poplar (Populus nigra)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Old homesteads and fencerows at low elevation.
Origin: Introduced from Europe
Flowers: March-April
Growth Duration: Perennial
White poplar (Populus alba)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Disturbed areas often associated with urban and suburban areas, riparian zones.
Origin: Introduced from Eurasia
Flowers: March-May
Growth Duration: Perennial
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
Growth Duration: Annual, Perennial
Corn poppy (Papaver rhoeas)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across much of North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: May-July
Growth Duration: Annual
Long prickly-head poppy (Papaver argemone)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho.
Habitat: Fields, roadsides, wasteltots, and other disturbed areas.
Origin: Introduced from Europe
Flowers: May-June
Growth Duration: Annual
Long-headed poppy (Papaver dubium)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon east to Idaho; also in the central U.S. and eastern North America.
Habitat: Fields, dunes, marshy areas, roadsides, wastelots, and other disturbed sites.
Origin: Introduced from Eurasia
Flowers: May-July
Growth Duration: Annual
Opium poppy (Papaver somniferum)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across various parts of North America to the Atlantic Coast.
Habitat: Waste areas, roadsides, and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: May-July
Growth Duration: Annual
Welsh poppy (Parameconopsis cambrica)
Distribution: Occurring west of the Cascades crest in Washington; southern British Columbia to Washington, perhaps introduced elsewhere.
Habitat: Forest edges where disturbed.
Origin: Introduced from Europe
Flowers: May-June
Growth Duration: Biennial, Perennial
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
Growth Duration: Perennial
Duck potato (Sagittaria latifolia)
Distribution: Occurring on both sides of the Cascades in Washington; Vancouver Island, British Columbia to central California; central North America to the Atlantic Coast.
Habitat: Ditches, ponds, lakes, swampy areas.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
Nuttall's povertyweed (Blitum nuttallianum)
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Great Plains.
Habitat: Dry to moist, saline or alkaline soil, from the desert plains to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Annual
Red povertyweed (Micromonolepis pusilla)
Distribution: Occurring east of the Cascades crest in Washington; disjunct in central Washington, otherwise from southern Oregon to California, east to Nevada, Utah, Wyoming, and Colorado.
Habitat: Sagebrush-steppe desert, often where alkaline.
Origin: Native
Flowers: May-June
Growth Duration: Annual
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Small-flower 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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Foxtail pricklegrass (Crypsis alopecuroides)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, and in eastern North America.
Habitat: Sandy soils around drying lake margins and other seasonally moist, disturbed, open areas.
Origin: Introduced from n. Africa and Eurasia
Flowers: April-July
Growth Duration: Annual
Modest pricklegrass (Crypsis vaginiflora)
Distribution: Occurring east of the Cascades crest in Washington in the Grant County area; Washington to California, east to Idaho and Nevada.
Habitat: Fields, roadsides, rocky parking areas, wastelots, and other disturbed sites.
Origin: Introduced from the western Mediterranean
Flowers: July-September
Growth Duration: Annual
Brittle prickly-pear (Opuntia fragilis)
Distribution: Occurring chiefly west 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
Growth Duration: Perennial
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
Growth Duration: Perennial
Little prickly-pear (Opuntia fragilis)
Distribution: Occurring chiefly west 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
Growth Duration: Perennial
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
Growth Duration: Biennial
Hooker's evening primrose (Oenothera elata)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington 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
Growth Duration: Biennial, Perennial
Long-tubed evening primrose (Oenothera flava)
Distribution: Occurring east of the Cascades crest, where known historically from the south-central area. Washington to California, east to the Rocky Mountains and Great Plains.
Habitat: Hard-packed soil in swales or around vernal pools in the plains and lower foothills.
Origin: Native
Flowers: July-August
Growth Duration: Perennial
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
Growth Duration: Perennial
Floating primrose-willow (Ludwigia peploides)
Distribution: Occurring west of the Cascades crest in King County in Washington; otherwise northern 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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Princess tree (Paulownia tomentosa)
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to Oregon; also Great Lakes region to Texas, east to the Atlantic Coast.
Habitat: Disturbed, open areas often relatively close to sites where trees are being cultivated.
Origin: Introduced from Eurasia
Flowers: May-June
Growth Duration: Perennial
California privet (Ligustrum ovalifolium)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to Washington.
Habitat: Disturbed forest edge, thickets, wastelots, and other disturbed areas.
Origin: Introduced from Europe
Flowers: May-July
Growth Duration: Perennial
Common privet (Ligustrum vulgare)
Distribution: Occurring chiefly west of the Cascades in Washington; British Columbia to Texas, east to the Atlantic Coast
Habitat: At low elevations in forest understory, forest and prairie edges, and disturbed areas.
Origin: Introduced from Europe
Flowers: April-May
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
Treelike puncturebract (Oxytheca dendroidea)
Distribution: Occurring east of the Cascades crest in Washington; central Washington to California, east to southern Idaho, Wyoming, and Nevada; also in South America.
Habitat: Sandy areas in sagebrush desert.
Origin: Native
Flowers: June-August
Growth Duration: Annual
Long purples (Lythrum salicaria)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Noxious weed of standing water and wet ground.
Origin: Introduced from Europe
Flowers: July-September
Growth Duration: Perennial
Common purslane (Portulaca oleracea)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from Europe
Flowers: june-September
Growth Duration: Annual
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
Growth Duration: Perennial
Pussypaws (Calyptridium umbellatum)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Baja California, east to Montana, Wyoming and Utah.
Habitat: Ponderosa pine forest openings to alpine slopes.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
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.
Habitat: Sagebrush desert to montane forest openings.
Origin: Native
Flowers: May-July
Growth Duration: Annual
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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 elevations to the alpine.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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 elevations to the alpine.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
White pussytoes (Antennaria pulvinata)
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common east of the crest; Yukon Territory to northern Washington, east to Alberta and Montana.
Habitat: Alpine areas where rocky.
Origin: Native
Flowers: July-August
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Perennial
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
Growth Duration: Annual
Wrinkle-seed pygmyweed (Crassula aquatica)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska 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
Growth Duration: Annual
One-sided pyrola (Orthilia secunda)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across Canada and the northern half of the United States to the Atlantic Coast.
Habitat: Common in coniferous woods at moderate to mid-elevationn in the mountains
Origin: Native
Flowers: June-August
Growth Duration: Perennial
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
Growth Duration: Perennial