Includes all flowering plants, conifers, ferns and fern-allies.
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198 common names
Show only taxa with photos
Index to common names:
hackberry,
hairgrass,
halimolobos,
halogeton,
hardgrass,
hardheads,
harebell,
hareleaf,
hawkbit,
hawksbeard,
hawkweed,
hawthorn,
hazelnut,
heartweed,
heath-grass,
heather,
hedge-hyssop,
hedge-nettle,
hedge-parsley,
helianthella,
heliotrope,
hellebore,
helleborine,
hellroot,
helmet,
hemlock,
hemlock-parsley,
hemp,
hemp nettle,
hen,
hen-nettle,
henbane,
henbit,
herb-bennet,
herb-Robert,
hesperochiron,
high-bush cranberry,
hoary-aster,
hoarycress,
hogbite,
hogweed,
holly,
holly-fern,
holy-clover,
honesty,
honey locust,
honeysuckle,
hops,
hopsage,
horehound,
hornwort,
horse-chestnut,
horse-nettle,
horsebrush,
horseradish,
horsetail,
horseweed,
hound's-tongue,
howellwort,
huckleberry,
hulsea,
hungerweed,
hutchinsia,
hyacinth,
hydrilla,
hymenopappus,
hyssop
(Celtis reticulata)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east through Southern Rockies to Kansas, Oklahoma and Texas.
Habitat: Open slopes and rocky bluffs.
Origin: Native
Flowers: April-May
Growth Duration: Perennial
(Deschampsia danthonioides)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the the Rocky Mountains; apparently introduced in Alaska, Yukon Territory, Arizona, New Mexico, and the eastern U.S.; disjunct in Chile and Argentina.
Habitat: Mesic to damp open slopes, ledges, vernal pools, scablands, stream banks, and roadsides.
Origin: Native
Flowers: May-July
Growth Duration: Annual
(Aira praecox)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California; also in eastern North America.
Habitat: Gravelly prairies, sea bluffs and dunes near the coast, also in other disturbed, open areas at low elevations.
Origin: Introduced from Europe
Flowers: April-September
Growth Duration: Annual
(Corynephorus canescens)
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to northwestern Washington.
Habitat: Moist disturbed, open areas at low elevations.
Origin: Introduced from Europe
Flowers: May-July
Growth Duration: Annual
(Vahlodea atropurpurea)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, east across Canada to the Atlantic Coast.
Habitat: Mountain meadows, streambanks, and lake margins to alpine ridges.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Aira caryophyllea)
Distribution: Occurring west of the Cascades crest in Washington and east in the Columbia River Gorge; British Columbia to California, east to Idaho and Wyoming, also in the southeastern U.S. and northeastern North America.
Habitat: Balds, prairies, meadows, forest openings, roadsides, wastelots, and other open areas at low to middle elevations.
Origin: Introduced Eurasia and North Africa
Flowers: May-August
Growth Duration: Annual
(Deschampsia elongata)
Distribution: Occurring on both sides of the Cascades in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Moist sandy or gravelly banks and slopes, and borders of streams and lakes.
Origin: Native
Flowers: June-July
Growth Duration: Perennial
(Deschampsia cespitosa)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the northern Great Plains, Great Lakes region, and eastern North America.
Habitat: From coastal marshes and moist prairies to alpine ridges, talus slopes, mountain meadows, and moist areas in the mountains in general.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
(Sandbergia perplexa)
Distribution: Occurring east of the Cascades crest in Washington, where known only from Douglas County; disjunct in central Washington, otherwise to western Idaho to southwestern Montana.
Habitat: Sagebrush desert, typically on lithosol.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
(Halogeton glomeratus)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Rocky Mountains.
Habitat: Fields, roadsides, wastelots, and other distrubed areas.
Origin: Introduced from Eurasia
Flowers: July-September
Growth Duration: Annual
(Sclerochloa dura)
Distribution: Occurring east 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.
Origin: Introduced from Europe
Flowers: April-June
Growth Duration: Annual
(Rhaponticum repens)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Disturbed dry slopes, meadows, fields, forest openings, and other disturbed, open places from low to middle elevations.
Origin: Introduced from central Asia
Flowers: June-September
Growth Duration: Perennial
(Campanula lasiocarpa)
Distribution: Occurring west of the Cascades crest in central Washington; Alaska to Washington, east to Northwest Territories and Alberta.
Habitat: Subalpine and alpine rock crevices and heathlands.
Origin: Native
Flowers: July-August
Growth Duration: Perennial
(Campanula parryi)
Distribution: Occurring in the Cascades Range and Olympic Mountains in Washington, where disjunct; central Idaho and adjacent Montana south in Rocky Mountains to Arizona and New Mexico.
Habitat: In subalpine and alpine areas.
Origin: Native
Flowers: July-August
Growth Duration: Perennial
(Campanula scabrella)
Distribution: Occurring chiefly east of the Cascades crest in Washington; disjunct in Washington and California from core distribution in Idaho and Montana.
Habitat: Open, rocky areas at high elevations.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Campanula rapunculoides)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to Oregon, east across much of North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
(Lagophylla ramosissima)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Montana, Idaho, and Nevada.
Habitat: Dry, open areas in sagebrush plains and foothills.
Origin: Native
Flowers: May-July
Growth Duration: Annual
(Leontodon autumnalis)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to Oregon, east to Idaho and Montana; also in eastern North America.
Habitat: Roadsides, pastures, open fields and other disturbed areas primarily in the lowlands, but also found along roads at alpine elevations in the mountains (e.g., Mt. Baker area).
Origin: Introduced from Eurasia
Flowers: July-September
Growth Duration: Perennial
(Leontodon saxatilis)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, Nevada, and Arizona, also in central and eastern North America.
Habitat: Roadsides, meadows, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: July-September
Growth Duration: Annual, Perennial
(Crepis tectorum)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across the northern regions of the U.S. and Canada to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Annual
(Crepis bakeri)
Distribution: Occurring east of the Cascades crest in central Washington; central Washington to California.
Habitat: Dry slopes, sagebrush, and forest openings from the foothills to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crepis barbigera)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho.
Habitat: Sagebrush deserts to ponderosa pine forest openings at middle elevations.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crepis setosa)
Distribution: Occurring west of the Cascades crest in southwestern Washington; southwestern British Columbia to California, also in Montana and eastern U.S.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced
Flowers: June-August
Growth Duration: Annual
(Crepis runcinata)
Distribution: Occurring east of the Cascades crest in Washington; southeastern British Columbia to California, east to the Great Plains.
Habitat: Moist to dry meadows, marshes, seeps, shores, riverbanks, often where alkaline, from the lowlands to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crepis nicaeensis)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; southwestern British Columbia to southwestern Oregon, also in western Montana, the Great Lakes region, and northeastern North America.
Habitat: Roadsides, fields, pastures, forest openings, and other disturbed areas, often where at least seasonally moist.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Annual
(Crepis intermedia)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Open forest, grassland, meadows, rocky or sandy slopes, and ridges from low to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crepis intermedia)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Open forest, grassland, meadows, rocky or sandy slopes, and ridges from low to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crepis intermedia)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Open forest, grassland, meadows, rocky or sandy slopes, and ridges from low to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crepis acuminata)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Dry slopes and forest openings from the foothiils to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Askellia pygmaea)
Distribution: Occurring in the Olympic and Cascades mountains in Washington; Alaska to California, east to Nunavut and Colorado, also in northeastern Canada; Asia.
Habitat: Talus, scree, moraines, sandy or gravelly slopes, subalpine to alpine.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
(Crepis modocensis)
Distribution: Occurring east of the Cascades crest in Washington; central British Columbia to California, east to Montana, Wyoming, and Colorado.
Habitat: Common in shrub-steppe, sagebrush, and conifer forest openings.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crepis runcinata)
Distribution: Occurring east of the Cascades crest in Washington; southeastern British Columbia to California, east to the Great Plains.
Habitat: Moist to dry meadows, marshes, seeps, shores, riverbanks, often where alkaline, from the lowlands to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crepis modocensis)
Distribution: Occurring east of the Cascades crest in Washington; central British Columbia to California, east to Montana, Wyoming, and Colorado.
Habitat: Common in shrub-steppe, sagebrush, and conifer forest openings.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crepis tectorum)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across the northern regions of the U.S. and Canada to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Annual
(Crepis tectorum)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across the northern regions of the U.S. and Canada to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Annual
(Crepis setosa)
Distribution: Occurring west of the Cascades crest in southwestern Washington; southwestern British Columbia to California, also in Montana and eastern U.S.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced
Flowers: June-August
Growth Duration: Annual
(Crepis atribarba)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Nevada, east to the Rocky Mountains and northern Great Plains.
Habitat: Dry slopes, sagebrush, and forest openings from foothills to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crepis capillaris)
Distribution: Occurring chiefly west of the Cascades crest and east in the Columbia River Gorge in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas at low elevation.
Origin: Introduced from Europe
Flowers: May-November
Growth Duration: Annual, Biennial
(Crepis acuminata)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Dry slopes and forest openings from the foothiils to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crepis nicaeensis)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; southwestern British Columbia to southwestern Oregon, also in western Montana, the Great Lakes region, and northeastern North America.
Habitat: Roadsides, fields, pastures, forest openings, and other disturbed areas, often where at least seasonally moist.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Annual
(Crepis occidentalis)
Distribution: Occurring chiefly east of the Cascades crest in Washington; central British Columbia to California, east to the Rocky Mountains and northern Great Plains of Canada and the U.S.
Habitat: Dry, open places, mostly in the foothills and plains, but also found in the subalpine.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Hieracium triste)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains of Canada and the U.S.
Habitat: Meadows and other open places in the mountains, usually at high elevations.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Hieracium lachenalii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to northern Oregon; also in eastern North America.
Habitat: Open forest, fields, shores, wastelots, and other disturbed areas generally at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
(Hieracium lachenalii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to northern Oregon; also in eastern North America.
Habitat: Open forest, fields, shores, wastelots, and other disturbed areas generally at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
(Hieracium lachenalii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to northern Oregon; also in eastern North America.
Habitat: Open forest, fields, shores, wastelots, and other disturbed areas generally at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
(Hieracium ×floribundum)
Distribution: Occurring in scattered locations in lowland western Washington; Washington east to Montana and Wyoming; eastern North America.
Habitat: Disturbed areas at low elevations.
Origin: Introduced
Flowers: May-July
Growth Duration: Perennial
(Hieracium ×stoloniflorum)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; no other reports from North America.
Habitat: Lawns, roadsides, ditches, and other disturbed areas, where escaping from cultivation.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
(Hieracium scouleri)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, Wyoming, and Utah.
Habitat: Mostly dry places in open woods, from foothills to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Hieracium longiberbe)
Distribution: Occurring in the Columbia River Gorge in Washington; south-central Washington to adjacent north-central Oregon; endemic to the Columbia River Gorge.
Habitat: Dry rocky slopes and ledges.
Origin: Native
Flowers: June-July
Growth Duration: Perennial
(Hieracium caespitosum)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho, Montana, and Wyoming; also occurring throughout eastern North America.
Habitat: Moist pastures, forest openings, roadsides, and springs, from the lowlands to middle elevations in the mountains, usually where disturbed.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
(Hieracium maculatum)
Distribution: Occurring west of the Cascades crest in lowland western Washington; southwestern British Columbia to western Washington.
Habitat: Lawns, railroads, wastelots, and other disturbed areas at low elevations.
Origin: Introduced from Europe
Flowers: June-August
(Hieracium pilosella)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to Oregon; also in northeastern North America.
Habitat: Roadsides, dry prairies, quarries, lawns, railroads, and other disturbed, open sites.
Origin: Introduced from Europe
Flowers: April-August
Growth Duration: Perennial
(Hieracium umbellatum)
Distribution: Occurring east of the Cascades crest and in the Columbia River Gorge in Washington; Alaska to northwestern Oregon, east across the northern half of North America to the Atlantic Coast; circumboreal.
Habitat: Moist places in thickets and open woods.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
(Hieracium aurantiacum)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across southern Canada and northern U.S; widely distributed throughout eastern U.S.
Habitat: Roadsides, fields, meadows, pastures, forest edge, wastelots, and other disturbed areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
(Hieracium sabaudum)
Distribution: Occurring west of the Cascades crest in Washington; southern British Columbia to Washington; also in eastern North America.
Habitat: Roadsides, sandy fields, and other disturbed areas.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
(Hieracium scouleri)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, Wyoming, and Utah.
Habitat: Mostly dry places in open woods, from foothills to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Hieracium triste)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains of Canada and the U.S.
Habitat: Meadows and other open places in the mountains, usually at high elevations.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Hieracium piloselloides)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to northeastern Oregon.
Habitat: Roadsides, meadows, forest openings, and other disturbed areas.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
(Hieracium umbellatum)
Distribution: Occurring east of the Cascades crest and in the Columbia River Gorge in Washington; Alaska to northwestern Oregon, east across the northern half of North America to the Atlantic Coast; circumboreal.
Habitat: Moist places in thickets and open woods.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
(Hieracium murorum)
Distribution: Occurring in scattered locations west of the Cascades crest in Washington; southern British Columbia to northern Oregon.
Habitat: Roadsides, open forest, railroads, and other disturbed areas.
Origin: Introduced from Europe
Flowers: April-June
Growth Duration: Perennial
(Hieracium flagellare)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to Washington, east to Idaho; also in eastern North America.
Habitat: Roadsides, dry meadows, railroads, and other disturbed, open areas at low elevations.
Origin: Introduced from Europe
Flowers: May-September
Growth Duration: Perennial
(Hieracium albiflorum)
Distribution: Widely distributed in forested areas on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern Canada.
Habitat: Open woods from low to middle elevations.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
(Hieracium albiflorum)
Distribution: Widely distributed in forested areas on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern Canada.
Habitat: Open woods from low to middle elevations.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
(Hieracium glomeratum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to Washington.
Habitat: Open forest, meadows, disturbed ground, roadsides, stream banks, and gravel pits generally at low elevations.
Origin: Introduced from Europe
Flowers: May-August
Growth Duration: Perennial
(Crataegus douglasii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Saskatchewan, Idaho and Montana, also in the Great Lakes region.
Habitat: Thickets, open forests, forest edges, and riparian zones, from lowlands to middle elevations.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
(Crataegus castlegarensis)
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to California, east to Idaho, Montana, and Utah.
Habitat: Grasslands, riparian zones, thickets, openings, and seeps.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crataegus douglasii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Saskatchewan, Idaho and Montana, also in the Great Lakes region.
Habitat: Thickets, open forests, forest edges, and riparian zones, from lowlands to middle elevations.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
(Crataegus monogyna)
Distribution: Occurring chiefly west of the Cascades crest in Washington; southern British Columbia to California, east to Montana, also in the Great Lakes region and eastern North America.
Habitat: Roadsides, fields, pastures, meadows, thickets, and forest edge and understory at low elevations, often associated with disturbance. Seeds readily dispersed by birds.
Origin: Introduced from Europe
Flowers: April-June
Growth Duration: Perennial
(Crataegus chrysocarpa)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Thickets, dry slopes, shrub-steppe, riparian zones, forest openings.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
(Crataegus gaylussacia)
Distribution: Occurring on both sides of the Cascades crest in Washington; disjunct in southeast Alaska, otherwise southern British Columbia to California, east to Montana.
Habitat: Thickets, grasslands, riparian zones, shores, and meadows, from lowl to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
(Crataegus macracantha)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to northeastern Oregon, east to the Rocky Mountains, and further east across the U.S. and Canada to the Atlantic Coast.
Habitat: Thickets, riparian zones, and pastures.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crataegus laevigata)
Distribution: Known only from the San Juan Islands in Washington.
Origin: Introduced from northern Europe
Growth Duration: Perennial
(Crataegus okennonii)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Washington, east to Idaho and Montana.
Habitat: Thickets, riparian zones, and grasslands.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crataegus okanaganensis)
Distribution: Occurring east of the Cascades crest in Washington in northern Washington; southern British Columbia to northern Washington, east to northern Idaho.
Habitat: Mesic thickets, riparian zones, and shorelines.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crataegus monogyna)
Distribution: Occurring chiefly west of the Cascades crest in Washington; southern British Columbia to California, east to Montana, also in the Great Lakes region and eastern North America.
Habitat: Roadsides, fields, pastures, meadows, thickets, and forest edge and understory at low elevations, often associated with disturbance. Seeds readily dispersed by birds.
Origin: Introduced from Europe
Flowers: April-June
Growth Duration: Perennial
(Crataegus ×cogswellii)
Distribution: Occurring west of the Cascades crest in Washington; western Washington to the Willamette Valley in Oregon.
Habitat: Wet prairie, thickets, and shores, generally occurring near where both parent species occur.
Origin: Introduced
Flowers: May-July
Growth Duration: Perennial
(Crataegus phippsii)
Distribution: Occurring east of the Cascades crest in north-central Washington; southern British Columbia to northern Washington, also in Montana but not known from Idaho.
Habitat: Floodplains, open forests, and thickets.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crataegus tenuior)
Distribution: Occurring east of the Cascades crest in north-central Washington; south-central British Columbia to north-central Washington.
Habitat: Grasslands, thickets, and forest openings.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crataegus gaylussacia)
Distribution: Occurring on both sides of the Cascades crest in Washington; disjunct in southeast Alaska, otherwise southern British Columbia to California, east to Montana.
Habitat: Thickets, grasslands, riparian zones, shores, and meadows, from lowl to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
(Crataegus macracantha)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to northeastern Oregon, east to the Rocky Mountains, and further east across the U.S. and Canada to the Atlantic Coast.
Habitat: Thickets, riparian zones, and pastures.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Crataegus laevigata)
Distribution: Known only from the San Juan Islands in Washington.
Origin: Introduced from northern Europe
Growth Duration: Perennial
(Corylus cornuta)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern North America.
Habitat: Forest edge and openings, thickets, and rocky slopes at low to middle elevations.
Origin: Native
Flowers: January-March
Growth Duration: Perennial
(Corylus avellana)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to Oregon, also known from western Idaho.
Habitat: Abandoned plantings, roadsides, waste sites, forest edge.
Origin: Introduced from Europe
Flowers: January-April
Growth Duration: Perennial
(Persicaria maculosa)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: A weedy species, usually on moist, cultivated or otherwise disturbed soil.
Origin: Introduced from Eurasia
Flowers: March-September
Growth Duration: Perennial
(Danthonia decumbens)
Distribution: Occurring west of the Cascades crest in southwestern Washington; southwestern British Columbia to California; also in northeastern Canada.
Habitat: Marshy margins, dunes, dry meadows, damp, disturbed
ground.
Origin: Introduced from Europe
Flowers: July-September
Growth Duration: Perennial
(Danthonia decumbens)
Distribution: Occurring west of the Cascades crest in southwestern Washington; southwestern British Columbia to California; also in northeastern Canada.
Habitat: Marshy margins, dunes, dry meadows, damp, disturbed
ground.
Origin: Introduced from Europe
Flowers: July-September
Growth Duration: Perennial
(Harrimanella stelleriana)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to Washington.
Habitat: Rocky slopes and seeps, alpine to subalpine
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Calluna vulgaris)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, also along the Atlantic Coast.
Habitat: Disturbed, open areas, where escaping from cultivation.
Origin: Introduced from Europe
Flowers: April-June
Growth Duration: Perennial
(Gratiola neglecta)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: In shallow water and on muddy shores, and in other wet places in the valleys and plains.
Origin: Native
Flowers: June-August
Growth Duration: Annual
(Gratiola ebracteata)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to western Montana.
Habitat: Shallow water and muddy shores, and in other wet places in the valleys and plains.
Origin: Native
Flowers: May-August
Growth Duration: Annual
(Gratiola neglecta)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: In shallow water and on muddy shores, and in other wet places in the valleys and plains.
Origin: Native
Flowers: June-August
Growth Duration: Annual
(Stachys cooleyae)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California.
Habitat: Forest understory, openings, and margins from low to moderate elevations in the mountains; often where moist.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Stachys arvensis)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California; also along the Gulf Coast and in the northeastern U.S.
Habitat: Weed in disturbed areas, typically where moist.
Origin: Introduced from Europe
Flowers: April-June
Growth Duration: Annual
(Stachys mexicana)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California.
Habitat: Forest understory, openings, and margins, often where moist.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Stachys rigida)
Distribution: Occurring west of the Cascades crest in Washington; southwestern Washington to California.
Habitat: Stream banks and moist bottom lands, mostly at low elevations.
Origin: Native
Flowers: July-August
Growth Duration: Perennial
(Stachys pilosa)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east across much of North America to the Atlantic Coast.
Habitat: Swamps, marshes, wetlands and riparian areas.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Yabea microcarpa)
Distribution: Occurring on both sides of the Cascades crest in Washington and in the Columbia River Gorge. British Columbia to Baja California, east to Idaho, Utah, and New Mexico.
Habitat: Along streams, open woodlands, and vernally moist slopes at low elevations.
Origin: Native
Flowers: April-June
Growth Duration: Annual
(Yabea microcarpa)
Distribution: Occurring on both sides of the Cascades crest in Washington and in the Columbia River Gorge. British Columbia to Baja California, east to Idaho, Utah, and New Mexico.
Habitat: Along streams, open woodlands, and vernally moist slopes at low elevations.
Origin: Native
Flowers: April-June
Growth Duration: Annual
(Torilis arvensis)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California, east to Idaho and Nevada, widespread from the U.S. midwest to the Atlantic Coast.
Habitat: Roadsides, forest edge, thickets, fields, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: July-September
Growth Duration: Annual
(Torilis japonica)
Distribution: Occurring chiefly west of the Cascades crest in Washington; southwestern British Columbia to California, also in south-central and eastern North America.
Habitat: Forest understory and edge, thickets, fields, roadsides, wastelots, and other disturbed areas at low elevations.
Origin: Introduced
Flowers: April-July
Growth Duration: Annual
(Torilis japonica)
Distribution: Occurring chiefly west of the Cascades crest in Washington; southwestern British Columbia to California, also in south-central and eastern North America.
Habitat: Forest understory and edge, thickets, fields, roadsides, wastelots, and other disturbed areas at low elevations.
Origin: Introduced
Flowers: April-July
Growth Duration: Annual
(Helianthella uniflora)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon and Nevada, east to the Rocky Mountains.
Habitat: Dry, open woods and meadows from low to middle elevations.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Heliotropium curassavicum)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Saline places at low evelevations, often in the beds of dried ponds.
Origin: Native
Flowers: June-September
Growth Duration: Annual, Perennial
(Heliotropium curassavicum)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Saline places at low evelevations, often in the beds of dried ponds.
Origin: Native
Flowers: June-September
Growth Duration: Annual, Perennial
(Veratrum insolitum)
Distribution: Occurring in the Columbia River Gorge in Washington; south-central Washington to northern California.
Habitat: Open prairies to thickets, and forested or open rocky slopes.
Origin: Native
Flowers: July - September
Growth Duration: Perennial
(Helleborus foetidus)
Distribution: Currently only known from lowland western Washington.
Habitat: Disturbed sites near urban or suburban areas, where escaped from cultivation.
Origin: Introduced from Eurasia
Flowers: February-April
Growth Duration: Perennial
(Epipactis helleborine)
Distribution: Occurring west of the Cascades crest in lowland areas in Washington; British Columbia to California, in scattered locations across North America to the Atlantic Coast, where more common.
Habitat: Moist to dry forest edge and understory, often where disturbed.
Origin: Introduced from Eurasia
Flowers: June-October
Growth Duration: Perennial
(Epipactis helleborine)
Distribution: Occurring west of the Cascades crest in lowland areas in Washington; British Columbia to California, in scattered locations across North America to the Atlantic Coast, where more common.
Habitat: Moist to dry forest edge and understory, often where disturbed.
Origin: Introduced from Eurasia
Flowers: June-October
Growth Duration: Perennial
(Epipactis gigantea)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Baja California, east to the Rocky Mountains and in scattered locations in the Great Plains.
Habitat: Stream banks, lake margins, around springs and seeps, especially in thermal waters in otherwise desert regions.
Origin: Native
Flowers: April-July
Growth Duration: Perennial
(Orobanche minor)
Distribution: Occurring in scattered locations west of the Cascades crest in Washington; Washington to Oregon, and reported from Idaho; also in Texas and along the East Coast of the U.S.
Habitat: Lawns, fields, pastures, forest edge, and other grassy areas at low elevations.
Origin: Introduced from Europe
Flowers: May-July
Growth Duration: Annual
(Impatiens glandulifera)
Distribution: Occurring west of the Cascades crest in Washington; Alaska to California, east to Idaho; also in eastern North America.
Habitat: Escaped from cultivation in disturbed forest edge at low elevations.
Origin: Introduced from Asia
Flowers: July-September
Growth Duration: Annual
(Tsuga mertensiana)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Montana.
Habitat: Middle to high elevations in the mountains
Origin: Native
Cones: June-July (cones)
Growth Duration: Perennial
(Tsuga heterophylla)
Distribution: Occurring chiefly west of the Cascades crest and in the northeast counties in Washington; Alaska to California, also in southeastern British Columbia, northern Idaho and western Montana.
Habitat: Moist, deep forests from sea level to middle elevations in the mountains
Origin: Native
Cones: May-June
Growth Duration: Perennial
(Conioselinum pacificum)
Distribution: Occurring west of the Cascades crest along the marine coast in Washington; Alaska to California.
Habitat: Bluffs and rocky or sandy beaches along the seashore.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Cannabis sativa)
Distribution: Occurring in scattered locations on both sides of the Cascades crest, but not likely persisting anywhere; occurring sporadically in other areas of North America.
Habitat: Illegal plantings in forest openings, roadsides, wastelots, and other disturbed areas, where escaping from cultivation.
Origin: Introduced from Asia
Flowers: June-September
Growth Duration: Annual
(Galeopsis bifida)
Distribution: Occurring east of the Cascades crest, where known from Kittitas County in Washington; Alaska to Washington, east across the northern U.S. and Canada to Atlantic Coast.
Habitat: Disturbed areas, roadsides, and irrigation channels.
Origin: Introduced from Eurasia
Flowers: July-August
Growth Duration: Perennial
(Galeopsis tetrahit)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to Montana, east across Canada and parts of midwestern U.S. to the Atlantic Coast.
Habitat: Disturbed meadows, roadsides, forest edge, and other moist places.
Origin: Introduced from Eurasia
Flowers: July-August
Growth Duration: Annual
(Atriplex prostrata)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, in scattered location across Canada and the U.S. to the Atlantic Coast.
Habitat: Along the coast in saline soils, beaches, and strands; inland in alkaline soils.
Origin: Introduced from Eurasia
Flowers: June-September
Growth Duration: Annual
(Lamium maculatum)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to Oregon, east to Idaho; also in eastern North America.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: April-August
Growth Duration: Perennial
(Hyoscyamus niger)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington to Oregon, east across much of North America to the Atlantic Coast.
Habitat: Roadsides and waste places.
Origin: Introduced from Europe
Flowers: May-August
Growth Duration: Annual
(Lamium purpureum)
Distribution: Occurring chiefly west of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Roadsides, fields, lawns, parks, wastelots, and other disturbed areas at lower elevations.
Origin: Introduced from Eurasia
Flowers: March-July
Growth Duration: Annual
(Lamium maculatum)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to Oregon, east to Idaho; also in eastern North America.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: April-August
Growth Duration: Perennial
(Geum urbanum)
Distribution: In scattered locations on both sides of the Cascades crest in Washington; Washington to Oregon, east to Idaho and Utah.
Habitat: Disturbed areas in including, roadsides, wastelots, and fields.
Origin: Introduced from Eurasia
Flowers: May-September
Growth Duration: Perennial
(Geranium robertianum)
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; Alaska to California, east to Montana, further east in Canada, the Great Lakes region, and eastern North America.
Habitat: Forest understory and forest edges, riparian zones, and other lowland areas with natural or man-made disturbances.
Origin: Introduced from Europe
Flowers: March-August
Growth Duration: Annual, Biennial
(Hesperochiron californicus)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to western Montana, Wyoming, and Utah.
Habitat: Mostly in more or less alkaline meadows and flats, in plains, foothills and valleys.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
(Hesperochiron pumilus)
Distribution: Occurring east of the Cascade crest in Washington; Washington to California, east to the Rocky Mountains.
Habitat: Meadows and moist, open slopes from the foothills to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
(Viburnum opulus)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon, east across Canada and the northern U.S. to the Atlantic Coast.
Habitat: Moist woods at low to moderate elevations.
Origin: Native and introduced from Eurasia
Flowers: May-July
Growth Duration: Perennial
(Dieteria canescens)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to southern California, east to the Great Plains.
Habitat: Dry, open places in the plains and foothills, occasionally extending into the mountains.
Origin: Native
Flowers: July-October
Growth Duration: Perennial
(Lepidium chalepense)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Great Lakes region.
Habitat: Disturbed areas, especially where dry, often associated with agriculture.
Origin: Introduced from Asia
Flowers: May-June
Growth Duration: Perennial
(Lepidium appelianum)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the northern Great Plains, Great Lakes region, and eastern U.,S.
Habitat: Disturbed soil, waste areas, in dry and moist places.
Origin: Introduced from Asia
Flowers: April-August
Growth Duration: Perennial
(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
(Lepidium chalepense)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Great Lakes region.
Habitat: Disturbed areas, especially where dry, often associated with agriculture.
Origin: Introduced from Asia
Flowers: May-June
Growth Duration: Perennial
(Chondrilla juncea)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Montana; also occurring in eastern North America.
Habitat: Roadsides, fields, sagebrush desert, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: July-September
Growth Duration: Perennial
(Heracleum maximum)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America except in the southeastern U.S.
Habitat: Moist areas, including meadows and forest edge from low to middle elevations.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Heracleum mantegazzianum)
Distribution: Occurring west of the Cascades crest in the Puget Trough lowlands in Washington; southwestern British Columbia to Oregon, also in eastern North America.
Habitat: Disturbed areas often associated with residential development; Class A noxious weed.
Origin: Introduced from Eurasia
Flowers: June-July
Growth Duration: Perennial
(Ilex aquifolium)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, also in scattered locations in eastern North America.
Habitat: Spread by birds, mostly forested areas at low elevations.
Origin: Introduced from Europe
Flowers: April-June
Growth Duration: Perennial
(Polystichum braunii)
Distribution: Occurring east of the Cascades crest in Washington, where known only from Pend Oreille County; Alaska to northeastern Washington, east to northern Idaho, also from Great Lakes region to northeastern North America; interruptedly circumboreal.
Habitat: Moist coniferous forest, often where rocky.
Origin: Native
Spores: June-October
Growth Duration: Perennial
(Polystichum andersonii)
Distribution: Occurring chiefly west of the Cascades crest in Washington; southern Alaska to northern Oregon, northern Idaho, and northwest Montana.
Habitat: Deep woods and thickets in the mountains.
Origin: Native
Growth Duration: Perennial
(Onobrychis viciifolia)
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Great Plains, also in eastern North America,
Habitat: Roadsides, fields, wastelots, and other disturbed areas.
Origin: Introduced
Flowers: June-August
Growth Duration: Perennial
(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
(Gleditsia triacanthos)
Distribution: Occurring east of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, east across North America where native to the central and eastern regions.
Habitat: On edge of riparian zones, typically in areas with some level of disturbance.
Origin: Introduced from central and eastern North America
Flowers: April-June
Growth Duration: Perennial
(Lonicera involucrata)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Forest openings and edge, thickets, and marshes from low elevations to the subalpine.
Origin: Native
Flowers: April-August
Growth Duration: Perennial
(Lonicera etrusca)
Distribution: Occasional west of the Cascades crest in Washington; southern British Columbia to Oregon.
Habitat: Thickets, forest edge, wastelots, and other disturbed areas.
Origin: Introduced from the Mediterranean region
Flowers: June-August
Growth Duration: Perennial
(Lonicera hispidula)
Distribution: Occurring west of the Cascades crest in lowland western Washington; British Columbia to California.
Habitat: Forest understory and edge, thickets, balds, and open woodlands at low elevations.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Lonicera japonica)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Washington to California, scattered eastward across the U.S. to the Atlantic Coast.
Habitat: Disturbed areas, woods, and thickets.
Origin: Introduced from Asia
Flowers: May-July
Growth Duration: Perennial
(Lonicera ciliosa)
Distribution: Occurring in or near forested areas on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to Montana.
Habitat: Open to rather dense woods, low to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Lonicera hispidula)
Distribution: Occurring west of the Cascades crest in lowland western Washington; British Columbia to California.
Habitat: Forest understory and edge, thickets, balds, and open woodlands at low elevations.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Lonicera pileata)
Distribution: Occurring west of the Cascades crest in Washington, where sparingly escaped from cultivation.
Habitat: Escaping from cultivation in forest understory.
Origin: Introduced from Eurasia
Growth Duration: Perennial
(Lonicera conjugialis)
Distribution: Occurring chiefly east of the Cascades crest in Washington mostly from Mt. Adams south, though a historical record is known from Yakima County; south-central Washington to the Sierra Nevada of California.
Habitat: In woods, meadows and moist open slopes at mid-elevations in the mountains.
Origin: Native
Flowers: June-July
Growth Duration: Perennial
(Lonicera utahensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to the Rocky Mountains.
Habitat: From middle to high elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Lonicera ×bella)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to Oregon and Idaho, scattered localities in central North America, and more widespread in eastern North America.
Habitat: Forest edge and understory, riparian areas, and disturbed areas at low to moderate elevations.
Origin: Introduced
Flowers: April-June
Growth Duration: Perennial
(Lonicera tatarica)
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: Disturbed areas, woods, and thickets.
Origin: Introduced from Eurasia
Flowers: May-July
Growth Duration: Perennial
(Lonicera utahensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to the Rocky Mountains.
Habitat: From middle to high elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Humulus lupulus)
Distribution: Occurring on both sides of the Cascades crest in Washington; occasionally escaped from cultivation in many areas in North America.
Habitat: Fields, thickets, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: July-August
Growth Duration: Perennial
(Grayia spinosa)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Wyoming and Colorado.
Habitat: Foothills and desert valleys, often in alkaline soil.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
(Marrubium vulgare)
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: Fields, roadsides, thickets, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: June-October
Growth Duration: Perennial
(Ceratophyllum echinatum)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California; also from central North America to the Atlantic Coast.
Habitat: In standing to slow-moving water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
(Aesculus hippocastanum)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to Oregon, also in central and eastern North America.
Habitat: Disturbed forested areas, particularly in urban and suburban areas where the species is planted as a street tree.
Origin: Introduced from Europe
Flowers: May-June
Growth Duration: Perennial
(Solanum carolinense)
Distribution: Occurring east of the Cascades crest in Washington, where historically, sporadically introduced; Washington to California, east across much of North America to the Atlantic Coast.
Habitat: Fields, roadsides, orchards, wastelots, and other disturbed areas.
Origin: Introduced from the southeastern U.S.
Flowers: June-August
Growth Duration: Perennial
(Solanum elaeagnifolium)
Distribution: Occurring east of the Cascades crest in southeastern Washington; Washington to California, east across the southern half of the U.S. to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from Mexico and eastern United States
Flowers: June-August
Growth Duration: Perennial
(Tetradymia canescens)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains.
Habitat: Dry, open places in sagebrush.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
(Tetradymia canescens)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains.
Habitat: Dry, open places in sagebrush.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
(Armoracia rusticana)
Distribution: Occurring in scattered locations east of the Cascades crest in Washington; Alaska to California, east across the U.S. and Canada to the Atlantic Coast.
Habitat: Disturbed areas including fields, roadsides and wastelots.
Origin: Introduced from Eurasia
Flowers: May-July
Growth Duration: Perennial
(Equisetum arvense)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America, except for the south-central and southeastern U.S., to the Atlantic Coast.
Habitat: Moist to moderately dry, often disturbed places, from the lowlands to the subalpine.
Origin: Native
Spores: April-July
Growth Duration: Perennial
(Equisetum ×ferrissii)
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Dry to wet, often disturbed areas, including gravelly roadsides.
Origin: Native
Growth Duration: Perennial
(Equisetum arvense)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America, except for the south-central and southeastern U.S., to the Atlantic Coast.
Habitat: Moist to moderately dry, often disturbed places, from the lowlands to the subalpine.
Origin: Native
Spores: April-July
Growth Duration: Perennial
(Equisetum telmateia)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to northern Idaho; Europe, northern Africa, and the Middle East.
Habitat: Moist areas in the lowlands.
Origin: Native
Growth Duration: Perennial
(Equisetum palustre)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across the northern U.S. and Canada to the Atlantic Coast; circumboreal.
Habitat: Streambanks, wet meadows, and marshes, from the lowlands to moderate elevations in the mountains.
Origin: Native
Growth Duration: Perennial
(Equisetum ×nelsonii)
Origin: Native
(Equisetum fluviatile)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to Oregon, east to the northern Rocky Mountains and northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Shallow water, marshes and bogs, along muddy shores, from the lowlands to moderate elevations in the mountains.
Origin: Native
Spores: April-July
Growth Duration: Perennial
(Equisetum hyemale)
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: Moist to wet areas, lowlands to moderate elevations in the mountains
Origin: Native
Growth Duration: Perennial
(Equisetum scirpoides)
Distribution: Occurring east of the Cascades crest in northeastern Washington; Alaska to Washington, east across the northern U.S.and Canada to the Atlantic Coast; circumboreal.
Habitat: Moist, swampy places, especially in coniferous forests.
Origin: Native
Growth Duration: Perennial
(Equisetum ×litorale)
Origin: Native
Growth Duration: Perennial
(Equisetum fluviatile)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to Oregon, east to the northern Rocky Mountains and northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Shallow water, marshes and bogs, along muddy shores, from the lowlands to moderate elevations in the mountains.
Origin: Native
Spores: April-July
Growth Duration: Perennial
(Equisetum variegatum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to Oregon, east across southern Canada and the northern third of the United States to the Atlantic Coast; circumboreal.
Habitat: Wet places, from sea level to alpine.
Origin: Native
Growth Duration: Perennial
(Equisetum fluviatile)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to Oregon, east to the northern Rocky Mountains and northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Shallow water, marshes and bogs, along muddy shores, from the lowlands to moderate elevations in the mountains.
Origin: Native
Spores: April-July
Growth Duration: Perennial
(Equisetum sylvaticum)
Distribution: Occurring east of the Cascades crest in the northeastern counties in Washington; Alaska to Washington, east across southern Canada and the northern United States to the Atlantic Coast; circumboreal.
Habitat: Shady coniferous forests, bog edges, and swamps
Origin: Native
Growth Duration: Perennial
(Equisetum sylvaticum)
Distribution: Occurring east of the Cascades crest in the northeastern counties in Washington; Alaska to Washington, east across southern Canada and the northern United States to the Atlantic Coast; circumboreal.
Habitat: Shady coniferous forests, bog edges, and swamps
Origin: Native
Growth Duration: Perennial
(Conyza canadensis)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Roadsides, fields, balds, prairies, ditches, wastelots, and other disturbed, open areas at low elevations.
Origin: Native
Flowers: July-September
Growth Duration: Annual, Biennial
(Adelinia grandis)
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California.
Habitat: Forest openings and meadows at low to moderate elevations.
Origin: Native
Flowers: April-May
Growth Duration: Perennial
(Cynoglossum officinale)
Distribution: Widely distributed east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, forest edge, ditches, and other disturbed open areas; noxious weed.
Origin: Introduced from Eurasia
Flowers: May-July
Growth Duration: Biennial
(Adelinia grandis)
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California.
Habitat: Forest openings and meadows at low to moderate elevations.
Origin: Native
Flowers: April-May
Growth Duration: Perennial
(Howellia aquatilis)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Washington to California, east to Idaho and Montana.
Habitat: In ponds and lakes.
Origin: Native
Flowers: May-July
Growth Duration: Annual
(Vaccinium deliciosum)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho.
Habitat: Forest openings and mountain meadows, mid- to high elevations.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Vaccinium cespitosum)
Distribution: Widely distributed in the mountainous areas of Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Moist rocky ridges and meadows, mid- to high elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Vaccinium ovatum)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California.
Habitat: Coniferous forests at low elevations.
Origin: Native
Flowers: April-August
Growth Duration: Perennial
(Rhododendron menziesii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Idaho, Montana, and Wyoming.
Habitat: Forest understory and edges from middle elevations to the subalpine.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
(Vaccinium parvifolium)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California.
Habitat: Moist woods, forest edges and openings, from sea level to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
(Vaccinium membranaceum)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Great Lakes region.
Habitat: Common in dry to moist coniferous forests and open areas, moderate to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Vaccinium membranaceum)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Great Lakes region.
Habitat: Common in dry to moist coniferous forests and open areas, moderate to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
(Hulsea nana)
Distribution: Occurring on both sides of the Cascades crest in Washington from Mount Rainier south; central Washington to California (not in northeastern Oregon).
Habitat: Generally around volcanic mountains above timberline.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
(Ranunculus arvensis)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Idaho and Utah; also in areas of central and eastern U.S.
Habitat: Dry woodlands and waste ground.
Origin: Introduced from Europe
Flowers: May-June
Growth Duration: Annual
(Hornungia procumbens)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, central Canada, and Newfoundland.
Habitat: Open areas where seasonally moist.
Origin: Introduced from Europe, North Africa, and Asia
Flowers: March-June
Growth Duration: Annual
(Hornungia procumbens)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, central Canada, and Newfoundland.
Habitat: Open areas where seasonally moist.
Origin: Introduced from Europe, North Africa, and Asia
Flowers: March-June
Growth Duration: Annual
(Triteleia hyacinthina)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho.
Habitat: Sagebrush deserts and grassy, often rocky areas from low to middle elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
(Hydrilla verticillata)
Distribution: Occurring west of the Cascades crest in Washington, where known only from King County; Washington, California, and in the southern and eastern U.S.
Habitat: Ponds, lakes, and slow-moving streams at low elevation.
Origin: Introduced from Eurasia
Growth Duration: Perennial
(Hymenopappus filifolius)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Great Plains.
Habitat: Dry, often sandy places in the foothills and plains.
Origin: Native
Flowers: May-October
Growth Duration: Perennial
(Verbena hastata)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Marshes, wetlands, streamsides, and other riparian areas.
Origin: Native
Flowers: July-September
Growth Duration: Biennial, Perennial