Asteraceae
Aster Family
Synonyms:
Compositae [HC]
129 genera
430 species
115 subspecies and varieties
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Achillea millefoliummilfoil, yarrow
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast; circumboreal
Habitat: Common in open, dry to somewhat moist areas from low to high elevations; tolerant of disturbance.
Origin: Both native and introduced populations
Flowers: February-October
Achillea ptarmicapearl yarrow
Distribution: Reported from Washington but no specimens seen; Alaska to Oregon, east in scattered locations across North America to the Atlantic Coast.
Habitat: Roadsides, wastelots, and other disturbed open areas where occasinally escaping from cultivation.
Origin: Introduced from Eurasia
Flowers: May-August
Adenocaulon bicolorpathfinder, trailplant
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
Ageratina occidentaliswestern boneset, western snakeroot
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Montana, Utah, and Nevada.
Habitat: Rocky places at various altitudes.
Origin: Native
Flowers: June-August
Agoseris ×agrestisfield agoseris
Origin: Native
Agoseris apargioidesseaside agoseris
Distribution: Occurring west of the Cascades crest in Washington along the outer coast. Washington to California.
Habitat: Coastal dunes and beach heads.
Origin: Native
Flowers: June-August
var. maritima – seaside agoseris
Agoseris aurantiacaorange agoseris
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, Great Plains, and Quebec.
Habitat: Meadows and forest openings at from middle elevations to the alpine.
Origin: Native
Flowers: June-August
var. aurantiaca – orange agoseris, slender agoseris
var. carnea – pink agoseris
Agoseris ×elatatall agoseris, tall goat-chicory
Distribution: Occurring on both sides of the Cascades crest in Washington; south-central British Columbia to California.
Habitat: Meadows and open woods, from the valleys to middle elevations in the mountains.
Origin: Native
Flowers: June-July
Agoseris glaucapale agoseris, short-beaked agoseris
Distribution: Occurring chiefly east of the Cascades crest in Washington; Yukon Territory to California, east to the Rocky Mountains, northern Great Plains, and Great Lakes region.
Habitat: Open forests and open areas, from low to high elevations in the mountains.
Origin: Native
Flowers: May-August
var. dasycephala – pale goat-chicory
var. glauca – pale agoseris, short beaked agoseris
Agoseris grandifloralarge-flowered agoseris
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana, Idaho and Nevada.
Habitat: Prairies, balds, meadows, and forest openings, often where seasonally dry, from low to middle elevations in the mountains.
Origin: Native
Flowers: May-August
var. grandiflora – large flowered agoseris, large flower goat-chicory
var. leptophylla – Puget Sound agoseris
Agoseris heterophyllaannual agoseris
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Idaho, Montana, Utah, and Arizona.
Habitat: Dry, open areas at low to mid-elevations.
Origin: Native
Flowers: April-July
Agoseris monticolamountain agoseris, Sierra Nevada agoseris
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Nevada.
Habitat: Mesic meadows in the subalpine and alpine, often in soils of volcanic origin.
Origin: Native
Flowers: July-August
Agoseris retrorsaspear leaved agoseris, spear leaf goat-chicory
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Nevada, Utah, and Arizona.
Habitat: Sagebrush desert, grassy slopes, and ponderosa pine forest openings at low to middle elevations.
Origin: Native
Flowers: May-June
Ambrosia acanthicarpaflat spine bur-ragweed, annual bursage, bur ragweed
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Great Plains.
Habitat: Sandy soils, dunes, and other well-drained soils in open areas at low to middle elevations, often locally common.
Origin: Native
Flowers: July-October
Ambrosia artemisiifoliaannual ragweed, common ragweed
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, pastures, wastelots, and other dry, disturbed, open areas at low elevations.
Origin: Introduced from eastern North America
Flowers: August-October
Ambrosia chamissonissilver beachweed, beach bur, cutleaf beach bur, silver bur-ragweed
Distribution: Occurring along the marine coastline beaches in Washington; British Columbia, south along the coast, to California.
Habitat: Common on sandy beaches above high tide level.
Origin: Native
Flowers: June-September
Ambrosia psilostachyaperennial ragweed, western ragweed
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Native
Flowers: July-October
Ambrosia trifidagiant ragweed
Distribution: Occurring chiefly east of the Cascades crest; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, wastelots, and other disturbed sites, often where moist.
Origin: Native
Flowers: July-October
Anaphalis margaritaceapearly everlasting
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast except for extreme southeastern U.S.
Habitat: Dry to somewhat moist open areas, from low elevations to the subalpine.
Origin: Native
Flowers: July-September
Anisocarpus madioideswoodland tarplant, woodland tarweed
Distribution: Occurring west of the Cascades crest in lowland western Washington; Southern British Columbia to southern California.
Habitat: Open woods and woodland edge, and thickets.
Origin: Native
Flowers: May-July
Antennaria alpinaalpine pussytoes
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
Antennaria anaphaloidestall pussytoes
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
Antennaria corymbosaflat topped pussytoes, meadow pussytoes
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
Antennaria dimorphacushion pussytoes, low pussytoes
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
Antennaria flagellarisstoloniferous pussytoes, whip pussytoes
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
Antennaria geyeriGeyer's pussytoes, pinewoods pussytoes
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
Antennaria howelliiHowell's pussytoes
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
ssp. howellii – Howell's pussytoes
ssp. neodioica – northern pussytoes
Antennaria lanatawoolly pussytoes
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
Antennaria luzuloidessilvery-brown pussytoes, woodrush pussytoes
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
ssp. luzuloides – silvery brown pussytoes, woodrush pussytoes
Antennaria mediaalpine pussytoes, Rocky Mountain pussytoes
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
Antennaria microphyllalittle-leaf pussytoes, rosy pussytoes, white pussytoes
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
Antennaria monocephalapygmy pussytoes, single-headed pussytoes
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
Antennaria parvifolialittle-leaf pussytoes, Nuttall's pussytoes
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
Antennaria pulcherrimashowy pussytoes
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
Antennaria racemosaHooker's pussytoes, raceme pussytoes
Distribution: Widely distributed in mountainous areas on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, and Wyoming.
Habitat: Dry to damp rocky slopes, forest openings, and ledges from low to middle elevations in the mountains.
Origin: Native
Flowers: May-August
Antennaria stenophyllanarrowleaved pussytoes
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
Antennaria umbrinellabrown-bract pussytoes, umber pussytoes
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
Anthemis arvensiscorn chamomile, field chamomile
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to the northern Great Plains in the U.S, widespread from the midwestern U.S. to eastern North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas generally at low elevations.
Origin: Introduced from Europe
Flowers: June-August
Anthemis cotulamayweed chamomile, stinking chamomile, dogfennel
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, ditches, wastelots, and other disturbed areas generally at low elevations.
Origin: Introduced from Europe
Flowers: May-October
Arctium lappagreat burdock, greater burdock
Distribution: Known from a few scattered locations in Washington; British Columbia to California, in Montana, east from California to Colorado and Arizona, also across Canadian Great Plains to Great Lakes region and northeastern North America.
Habitat: Roadsides, ditches, forest openings and edge, wastelots, and other disturbed areas generally at low elevations.
Origin: Introduced from Eurasia
Flowers: August-October
Arctium minuscommon burdock, lesser burdock
Distribution: Occurring on both sides of the Cascades crest in Washington; British to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, wastelots, and other disturbed open areas at low to middle elevations.
Origin: Introduced
Flowers: July-October
Arnica chamissonisleafy arnica, meadow arnica, narrowleaf arnica, silvery arnica, leafy leapordbane
Distribution: Occurring both sides of the Cascades, including the northeastern corner of Washington; Alaska to California, east to the Rocky Mountains, east across Canada to the Atlantic Coast.
Habitat: Meadows and wet places from middle elevations to the subalpine.
Origin: Native
Flowers: June-September
Arnica cordifoliaheart-leaf arnica, heart-leaf leopardbane
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, and the Great Lakes region.
Habitat: Light forest understory, openings, and edge, from low elevations to the subalpine.
Origin: Native
Flowers: April-July
Arnica discoidearayless arnica, rayless leopardbane
Distribution: Occurring in the Cascades Mountains of Klickitat and Skamania counties in Washington; Washington to California, east to Nevada.
Habitat: Forest openings from middle elevations to the subalpine.
Origin: Native
Flowers: June-August
Arnica fulgenshillside arnica, orange arnica, shining leopardbane
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Meadows and open slopes from the foothills to middle elevations in the mountains
Origin: Native
Flowers: May-July
Arnica gracilisslender arnica, slender leopardbane
Distribution: Occurring on both sides of the Cascades crest in the mountainous areas in Washington; British Columbia to Oregon, east to Alberta, Montana, Wyoming, and Utah.
Habitat: Dry, rocky slopes and meadows, from the subalpine to alpine.
Origin: Native
Flowers: June-August
Arnica lanceolataclasping arnica, stream bank arnica
Distribution: Occurring on both sides of the Cascades crest in Washington, including the Olympic Mountains and the northeastern region; Alaska to California, east to the Rocky Mountains, also in northeastern North America.
Habitat: Streambanks, moist woods and meadows from middle elevations to the subalpine.
Origin: Native
Flowers: June-August
ssp. prima – clasping arnica, streambank arnica, streambank leopardbane
Arnica latifoliabroad-leaved arnica, mountain arnica, daffodil leopardbane
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Common in forest openings and meadows, and open, rocky areas from middle to high elevations in the mountains.
Origin: Native
Flowers: June-August
Arnica longifolialongleaf arnica, seep spring arnica, spear-leaf leopardbane
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Rocky soil in seeps or springs, cliffs, or riverbanks, from middle elevations to the alpine.
Origin: Native
Flowers: July-September
Arnica molliscordilleran arnica, hairy arnica, cordilleran leopardbane
Distribution: Occurring on both sides of the Cascades crest and in the Olympic Mountains in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Moist meadows from middle elevations to the alpine.
Origin: Native
Flowers: June-September
Arnica nevadensisNevada arnica, Sierra arnica, Sierran leopardbane
Distribution: Occurring in the Cascades and Olympic mountains in Washington; Washington to California, east to Nevada.
Habitat: Open, rocky slopes and forest openings in the subalpine and alpine.
Origin: Native
Flowers: June-August
Arnica ovatasticky arnica, sticky-leaf arnica
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Montana and Utah.
Habitat: Rocky places from middle elevations to the subalpine and alpine.
Origin: Native
Flowers: July-September
Arnica parryiParry's arnica
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to California, east to the Rocky Mountains.
Habitat: Open woods and meadows, from middle elevations to the alpine.
Origin: Native
Flowers: June-August
Arnica rydbergiiRydberg's arnica, subalpine arnica, subalpine leopardbane
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to northern California, east to Alberta and Colorado.
Habitat: Dry meadows and open slopes at high elevations in the mountains.
Origin: Native
Flowers: June-August
Arnica sororiabunch arnica, twin arnica, twin leopardbane
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, and Wyoming.
Habitat: From low elevation prairies and grasslands to coniferous forest openings at middle elevations.
Origin: Native
Flowers: May-July
Artemisia absinthiumabsinthe, oldman, wormwood
Distribution: Occurring 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, ditches, wastelots, and other disturbed open areas.
Origin: Introduced from Eurasia
Flowers: July-September
Artemisia annuasweet Annie, sweet sagewort, annual wormwood
Distribution: Occurring in scattered locations east of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed open places.
Origin: Introduced from Eurasia
Flowers: August-October
Artemisia arbusculadwarf sagebrush, low sagebrush
Distribution: Occurring east of the Cascades crest in Washington; central Washington to California, east to the Rocky Mountains.
Habitat: Open, dry plains and hills in sagebrush desert.
Origin: Native
Flowers: July-September
ssp. arbuscula – little sagebrush, low sagebrush
Artemisia biennisbiennial wormwood
Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; Alaska to California, east across most of North America to the Atlantic Coast, where considered introduced.
Habitat: Roadsides, fields, irrigation ditches, streambanks, and other disturbed open areas, especially in sandy soil.
Origin: Native
Flowers: August-October
Artemisia campestrisPacific sagewort, northern wormwood
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast; also in Eurasia.
Habitat: Open places, often in sandy or rocky soil, from low elevations to alpine.
Origin: Native
Flowers: July-September
var. borealis – northern wormwood
var. scouleriana – Pacific sagewort, Scouler's wormwood
var. wormskioldii – Columbia Islands sagewort, Wormskiold's wormwood sagewort
Artemisia canahoary sagebrush, silver sagebrush
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Meadows and forest openings from low to middle elevations in the mountains.
Origin: Native
Flowers: July-September
ssp. bolanderi – Bolander's hairy sagebrush
Artemisia douglasianaDouglas's mugwort, Douglas's sagewort, Douglas's wormwood
Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, east to Nevada.
Habitat: Mostly along stream banks and river bottoms.
Origin: Native
Flowers: July-September
Artemisia dracunculusdragon sagewort, tarragon, dragon wormwood
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Great Plains and Great Lakes region.
Habitat: Sagebrush desert to ponderosa pine forest openings at middle elevations.
Origin: Native
Flowers: July-October
Artemisia frigidaprairie sagebrush, prairie sagewort
Distribution: Occurring east of the Cascades crest in Washington; Alaska to Washington, east to the Great Plains, Great Lakes region, and northeastern North America.
Habitat: Dry, open sagebrush plains and foothills.
Origin: Native
Flowers: July-September
Artemisia furcatathree-forked mugwort, forked wormwood
Distribution: Occurring in the Cascades and Olympic Mountains of Washington; Alaska to Washington, east to Northwest Territories, Alberta, and Nunavut.
Habitat: Open, rocky ledges and talus slopes in the subalpine and alpine.
Origin: Native
Flowers: July-September
Artemisia ludovicianawestern mugwort, prairie sage
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Meadows and open slopes, from the lowlands to the alpine.
Origin: Native
Flowers: June-October
ssp. candicans – gray sagewort
ssp. incompta – intermediate sagewort, mountain wormwood
ssp. lindleyana – Lindley's western mugwort, Lindley's prairie sage
ssp. ludoviciana – western mugwort, Louisiana sagewort, silver wormwood
Artemisia michauxianaMichaux's mugwort, lemon sagewort, Michaux's wormwood
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta and Wyoming.
Habitat: Rocky places in the mountains at rather high elevations.
Origin: Native
Flowers: May-August
Artemisia norvegicamountain sagewort, boreal wormwood
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains.
Habitat: Subalpine and alpine areas, typically where moist.
Origin: Native
Flowers: July-September
ssp. saxatilis – mountain sagewort
Artemisia rigidascabland sagebrush, stiff sagebrush
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho and Montana.
Habitat: Dry, rocky places from the plains and foothills to moderate elevations in the mountains.
Origin: Native
Flowers: September-October
Artemisia spiciformissnowfield sagebrush, spiked sagebrush
Distribution: Occurring east of the Cascades crest in Washington; central Washington to California, east to southwestern Montana, Wyoming, and Colorado.
Habitat: Cool, moist slopes, from middle elevations to subalpine.
Origin: Native
Flowers: July-September
Artemisia stellerianadusty miller, oldwoman, beach wormwood, Steller's wormwood
Distribution: Occurring west of the Cascades crest along the northeastern coast of the Olympic Peninsula in Washington; native to Alaska, also occurring from the Great Lakes region east to northeastern North America.
Habitat: Coastal dunes and beaches in developed coastal areas, where escaping from cultivation.
Origin: Introduced
Flowers: May-September
Artemisia suksdorfiicoastal mugwort, Suksdorf's sagewort, coastal wormwood
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California.
Habitat: Bluffs, beaches, rocky areas, and riverbanks, especially near the coast.
Origin: Native
Flowers: June-August
Artemisia tilesiiAleutian mugwort, Cascade wormwood
Distribution: Occurring in the Olympic and Cascade Mountains of Washington; Alaska to Oregon, east to Montana, and east across Canada to Quebec.
Habitat: Open rocky or gravelly, wet or dry sites, from middle elevations to the alpine, descending to sea level northward.
Origin: Native
Flowers: July-September
Artemisia tridentatabig sagebrush
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Dry plains and foothills to the subalpine, but not in lithosol or alkaline soil.
Origin: Native
Flowers: July-September
ssp. tridentata – big sagebrush
ssp. vaseyana – mountain big sagebrush, Vasey sagebrush
ssp. wyomingensis – Wyoming sagebrush
Artemisia tripartitacut-leaf sagebrush, threetip sagebrush
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon and Nevada, east to Idaho and Wyoming.
Habitat: Sagebrush desert and grasslands.
Origin: Native
Flowers: July-September
ssp. tripartita – cutleaf sagebrush, threetip sagebrush
Artemisia vulgarismugwort, lobed wormwood
Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; Alaska to Oregon, east to Montana, east across Canada to the Great Lakes region and eastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Eurasia
Flowers: August-October
Askellia pygmaealow hawksbeard
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
Baccharis pilularischaparral broom, coyote brush
Distribution: Occurring west of the Cascades crest in southern Washington; Washington to California, also in New Mexico.
Habitat: Coastal dunes, bluffs, and thickets.
Origin: Native
Flowers: August-September
ssp. consanguinea – chaparral broom
Balsamorhiza ×bonserihybrid balsamroot
Distribution: Local in eastern Washington where Balsamorhiza rosea is found
Habitat: Dry, rocky slopes at low elevation
Origin: Native
Balsamorhiza careyanaCarey's balsamroot
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to central Oregon.
Habitat: Open places, but not on lithosol, in the plains, foothills, and lower mountains.
Origin: Native
Flowers: March-July
Balsamorhiza careyana × Balsamorhiza hookerihybrid balsamroot
Origin: Native
Balsamorhiza deltoideadeltoid balsamroot, Puget balsamroot
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California.
Habitat: Prairies, open slopes, and forest edge at low elevations.
Origin: Native
Flowers: March-July
Balsamorhiza hookerihairy balsamroot, hare's head balsamroot, Hooker's balsamroot
Distribution: Occurring east of the Cascades crest in central Washington; Washington to California, east to western Montana, southern Idaho, and Nevada.
Habitat: Dry, open areas at low to moderate elevations, usually in lithosol (rocky, cobbly soil).
Origin: Native
Flowers: April-June
Balsamorhiza hookeri × Balsamorhiza sagittatahybrid balsamroot
Origin: Native
Balsamorhiza incanahoary balsamroot, woolly balsamroot
Distribution: Occurring east of the Cascades crest in the southeastern counties in Washington; southeastern Washington to adjacent Oregon, east through Idaho to Montana and Wyoming.
Habitat: Mesic meadows and slopes at lower to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
Balsamorhiza rosearosy balsamroot
Distribution: Occurring east of the Cascades crest in south-central Washington; south-central Washington to northeastern Oregon.
Habitat: Dry, rocky slopes at low elevation.
Origin: Native
Flowers: April-May
Balsamorhiza sagittataarrowleaf balsamroot
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Shrub-steppe, grasslands, and other open areas from low to middle elevations.
Origin: Native
Flowers: April-July
Balsamorhiza serrataserrrate balsamroot, toothed balsamroot
Distribution: Occurring east of the Cascades crest in south-central and southeastern Washington; Washington to California, east to Nevada.
Habitat: Rock outcrops and dry, rocky knolls.
Origin: Native
Flowers: April-June
Balsamorhiza ×terebinthaceawormwood balsamroot
Origin: Native
Balsamorhiza ×tomentosawooly hybrid balsamroot
Origin: Native
Bellis perennisEnglish daisy, lawn daisy
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, and in central and eastern U.S.
Habitat: Fields, parks, lawns, balds, wastelots, and other disturbed or cultivated areas, usually where moist.
Origin: Introduced
Flowers: March-September
Bidens amplissimaVancouver Island beggar-ticks
Distribution: Occurring west of the Cascades crest in the northern Puget Trough area in Washington; southwestern British Columbia to King County, Washington.
Habitat: Wetlands, estuaries, pond and stream margins.
Origin: Native
Flowers: July-October
Bidens beckiiBeck's water marigold
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to Oregon, east to Montana, east across Canada to the Great Lakes region and northeastern North America.
Habitat: Lowland ponds and lakes.
Origin: Native
Flowers: July-September
Bidens cernuanodding beggar-ticks, bur-marigold
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Stream banks, pond and lake edges, and other wet places at low elevations.
Origin: Native
Flowers: July-September
Bidens connatapurplestem beggars-ticks, swamp beggar-ticks
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to Idaho and Montana; native from central North America east to the Atlantic Coast.
Habitat: Marshes, shorelines and other wet, sunny areas.
Origin: Introduced from eastern North America
Flowers: August-September
Bidens frondosaleafy beggar-ticks, devil's pitchfork, sticktight
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
Bidens tripartitathree-lobed beggar-ticks
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast where native.
Habitat: Wet places, often where disturbed, primarily at low elevations.
Origin: Introduced from Eurasia and eastern North America
Flowers: August-October
Bidens vulgatatall beggar-ticks, western sticktight
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across all but the southwestern U.S. to the Atlantic Coast.
Habitat: Streamsides, ponds, lakes, ditches and other moist to wet waste places.
Origin: Introduced from British Columbia
Flowers: July-October
Blepharipappus scaberblepharipappus, rough eyelashweed
Distribution: Occurring east of the Cascades crest in southeastern Washington; southeastern Washington to California, east to Idaho and northwest Nevada.
Habitat: Grasslands, open slopes, forest edge, sagebrush desert, and other open areas at low elevations.
Origin: Native
Flowers: April-June
Boltonia asteroideswhite doll's daisy
Distribution: Occurring west of the Cascades crest along the lower Columbia River in southwestern Washington; southwestern Washington to adjacent northwestern Oregon, otherwise native from the Great Plains to the Atlantic Coast.
Habitat: Lowland flood plains and wet meadows.
Origin: Introduced from central and eastern North America
Flowers: July-September
var. recognita – white doll's daisy
Brickellia grandifloratasselflower brickellbush, large flowered tasselflower, large flowered thoroughwort
Distribution: Occasional east of the Cascades in Washington and Oregon.
Habitat: Openings in woods at moderate elevations, sometimes in plains.
Origin: Native
Flowers: July-October
Brickellia microphyllasmall-leaved brickellbush
Distribution: Occurring east of the Cascades crest in southeastern Washington; southeastern Washington to California, east to Idaho, Wyoming, Colorado, and Arizona.
Habitat: Dry, rocky foothills, canyons, washes.
Origin: Native
Flowers: August-October
var. microphylla – small-leaved brickellbush, small-leaved brickellia
Brickellia oblongifolianarrow-leaved brickellbush, narrow-leaved thoroughwort
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California east to the Rocky Mountains.
Habitat: Dry, often rocky places from lowland sagebrush desert to middle elevations in the mountains.
Origin: Native
Flowers: May-August
var. oblongifolia – narrowleaf brickellia
Cacaliopsis nardosmiasilvercrown luina, tall silvercrown
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to California.
Habitat: Meadows, forest edge, forest openings, and light forest understory from low to middle elevations.
Origin: Native
Flowers: May-July
Calendula officinalispot marigold
Origin: Introduced
Canadanthus modestusfew-flowered aster, great northern aster
Distribution: Widely distributed on both sides of the Cascades crest in the mountainous areas of Washington; Yukon Territory to Oregon, east to the northern Great Plains and Great Lakes region.
Habitat: Streambanks, pond and lake margins, and moist woods at middle-elevations in the mountains.
Origin: Native
Flowers: July-September
Carduus acanthoidesplumeless thistle, spiny plumeless thistle
Distribution: Occurring east of the Cascades crest in northeastern Washington; British Columbia to Washington, also in California, east to the northern Rocky Mountains, Great Plains, and eastern North America.
Habitat: Roadsides, fields, ditches, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: July-October
Carduus nutansmusk thistle, nodding thistle
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Eurasia
Flowers: June-October
Carduus pycnocephalusItalian plumeless thistle
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
ssp. pycnocephalus – Italian plumeless thistle
Carduus tenuiflorusslender flowered thistle, winged plumeless thistle
Distribution: Occurring west of the Cascades crest in southwestern Washington; Washington to California, also in the eastern U.S.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed areas at low elevations.
Origin: Introduced from Europe
Flowers: June-July
Centaurea benedictablessed thistle
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Rocky Mountains, also in eastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Eurasia
Flowers: June-August
Centaurea calcitrapapurple starthistle, red starthistle
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to New Mexico, also in eastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced
Flowers: July-September
Centaurea cyanusbachelor's button, garden cornflower
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, meadows, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced from the Mediterranean region
Flowers: May-October
Centaurea diffusadiffuse knapweed, tumble knapweed, white knapweed
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to California, east across much of the U.S. and Canada to northeastern North America.
Habitat: Roadsides, fields, meadows, ditches, wastelots, and other disturbed, open areas; noxious.
Origin: Introduced from the eastern Mediterranean region
Flowers: July-September
Centaurea ×gerstlauerihybrid knapweed, meadow knapweed, protean knapweed
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho and Montana; also in eastern North America.
Habitat: Roadsides, fields, ditches, meadows, wastelots, and other disturbed open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-September
Centaurea ibericaIberian knapweed, Iberian starthistle
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, also in Wyoming and Kansas.
Habitat: Roadsides, fields, dry meadows, ditches, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: June-August
Centaurea jaceabrown knapweed, brownray knapweed
Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to the Rocky Mountains, also from the Great Lakes region east to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, meadows, shores, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: July-September
Centaurea macrocephalaglobe knapweed
Distribution: Occurring east of the Cascades crest in Washington; central Washington to Montana, also in Colorado, and Great Lakes region to northeastern North America.
Habitat: Roadsides and meadows.
Origin: Introduced from Eurasia
Flowers: June-September
Centaurea melitensisMaltese starthistle, tocalote
Distribution: Occurring chiefly west of the Cascades in Washington; British Columbia to California and Mexico, east to Texas and eastern North America.
Habitat: Roadsides, meadows, balds, fields, ditches, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from the Mediterranean region
Flowers: June-September
Centaurea montanamountain bluet, mountain cornflower, montane starthistle
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to Oregon, east to Montana, Idaho, and Utah, also from Great Lakes region to northeastern North America.
Habitat: Roadsides, fields, ditches, shores, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: May-August
Centaurea nigrablack knapweed, lesser knapweed
Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to Montana, also Great Lakes region east to northeastern North America.
Habitat: Roadsides, fields, meadows, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: July-September
Centaurea nigrescensshort fringed knapweed, Tyrol knapweed
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana and Wyoming, also from Great Lakes region east to northeastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: July-September
Centaurea solstitialisyellow star-thistle
Distribution: Occurring chiefly east of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, meadows, grassy slopes, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: July-September
Centaurea stoebespotted knapweed
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Forest openings, meadows, fields, roadsides, wastelots, and other disturbed open areas from low to middle elevations.
Origin: Introduced from Europe
Flowers: June-October
ssp. australis – spotted knapweed
Centaurea trichocephalafeatherhead knapweed
Origin: Introduced
Centaurea ×varnensishybrid diffuse knapweed, sand knapweed
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho; also in eastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-August
Centromadia pungenscommon spikeweed
Distribution: Occurring east of the Cascades crest in central and south-central Washington; central Washington to California, where native east to Idaho, Nevada, and Arizona.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open places at low to middle elevations.
Origin: Introduced from California
Flowers: July-Sept.
ssp. pungens – common spikeweed, western spikeweed
Chaenactis douglasiihoary chaenactis, hoary false-yarrow
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Sagebrush desert flats and slopes, ponderosa pine forest openings, and meadows near the subalpine.
Origin: Native
Flowers: May-September
var. douglasii – dustymaidens, hoary false yarrow
Chaenactis thompsoniiThompson's pincushion
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
Chondrilla junceahogbite, rush skeletonweed, gum succory
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
Chrysothamnus viscidiflorusgreen rabbit-brush
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the northern Great Plains.
Habitat: Sagebrush desert to ponderosa pine forest openings.
Origin: Native
Flowers: July-September
ssp. lanceolatus – sticky-leaf rabbitbrush, yellow rabbitbrush
ssp. viscidiflorus – sticky flowered rabbitbrush, sticky-leaf rabbitbrush, yellow rabbitbrush
Cichorium intybuschicory, wild succory
Distribution: Widely distributed 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, ditches, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: July-October
Cirsium arvenseCanadian thistle, creepiing thistle
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, pastures, prairies, grasslands, wastelots, and other disturbed areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: May-October
Cirsium brevifoliumPalouse thistle
Distribution: Occurring east of the Cascades crest in eastern and southeastern Washington; eastern Washington to northeast Oregon and adjacent Idaho.
Habitat: Palouse grassland remnants, dry rocky slopes, and roadsides.
Origin: Native
Flowers: June-October
Cirsium brevistylumclustered thistle, short-styled thistle
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to northern California, east to Montana.
Habitat: Slopes, open forest, and moist meadows from low to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Cirsium eduleedible thistle
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon.
Habitat: Forest openings and edge, meadows, roadsides, and other open areas at low to middle elevations in the mountains.
Origin: Native
Flowers: July-September
var. edule – edible thistle, Indian thistle, Macoun's thistle
var. wenatchense – Wenatchee thistle
Cirsium flodmaniiFlodman's thistle
Distribution: British Columbia to north-central Washington,south in the Rocky Mountains from Alberta, east to the Great Plains and Great Lakes region.
Habitat: Grasslands, stream banks, and roadsides at low to middle elevations.
Flowers: June-August
Cirsium hookerianumHooker's thistle, white thistle
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Washington, east to Alberta, Montana, and Wyoming.
Habitat: Moist lowlands, open slopes and fields.
Origin: Native
Flowers: July-August
Cirsium inamoenumGreene's thistle
Distribution: Occurring east of the Cascades crest in southeastern Washington; southeastern Washington to California, east to Idaho, Wyoming, and Utah.
Habitat: Grassland, sagebrush desert, and dry rocky slopes from low to middle elevations.
Origin: Native
Flowers: June-August
var. inamoenum – Greene's thistle
Cirsium remotifoliumfew-leaf thistle, Pacific fringed thistle, remote-leaved thistle, weak thistle
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; Washington to California.
Habitat: Meadows, stream banks, open for, brushy slopes, from low to middle elevations in the mountains.
Origin: Native
Flowers: June-September
Cirsium scariosumelk thistle, meadow thistle
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Wet meadows, moist, sometimes alkaline ground, and forest openings from the foothills to fairly high elevations in the mountains.
Origin: Native
Flowers: June-August
Cirsium undulatumwavy leaf thistle
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Michigan and Texas.
Habitat: Dry hillsides and plains at low elevations.
Origin: Native
Flowers: May-September
Cirsium vulgarebull thistle, common thistle
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Roadsides, fields, forest edge, ditches, balds, prairies, wastelots, and other disturbed, open areas.
Origin: Introduced from Eurasia
Flowers: June-September
Columbiadoria halliiColumbia River daisy, Hall's goldenweed
Distribution: Occurring in the east end of the Columbia River Gorge in Washington; Washington to Oregon.
Habitat: Dry, open or sparsely wooded slopes at low elevations.
Origin: Native
Flowers: August-October
Conyza bonariensisSouth American conyza
Distribution: Occurring west of the Cascades crest in lowland western Washington; Washington to California, eastward in the southern U.S. to the Atlantic Coast.
Habitat: Roadsides, fields, wastelots, and disturbed open areas at low elevations.
Origin: Introduced from South America
Flowers: June-August
Conyza canadensisCanadian fleabane, horseweed
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
Coreopsis grandiflorabigleaf tickseed
Origin: Introduced
Coreopsis lanceolatalance-leaved tickseed
Origin: Introduced
Coreopsis tinctoriacalliopsis, Columbia coreopsis
Distribution: Occurring chiefly east of the Cascades crest and along the lower Columbia River in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Open and disturbed areas at low to mid elevations where seasonally moist.
Origin: Native
Flowers: June-August
Cota austriacaAustrian chamomile
Distribution: Occurring east of the Cascades crest in Washington, where known from the Pullman area; not known from elsewhere in North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced
Flowers: July-August
Cota tinctoriagolden chamomile, yellow chamomile
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across the central and northern regions of North America to the Atlantic Coast.
Habitat: Roadsides, fields, wastelots, and other disturbed, open areas.
Origin: Introduced
Flowers: July-September
Cotula coronopifoliabrass buttons, common brass buttons
Distribution: Occurring west of the Cascades crest along the Puget Sound, outer coast, and lower Columbia River shorelines. Alaska to California, east to Nevada and Arizona, also in northeastern North America.
Habitat: Tidal flats.
Origin: Introduced from South Africa
Flowers: June-September
Crepis acuminatalong-leaved hawksbeard, tapertip hawksbeard
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
Crepis atribarbaslender hawksbeard
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
Crepis bakeriBaker's hawksbeard
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
Crepis barbigerabearded hawksbeard
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
Crepis capillarissmooth hawksbeard
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
Crepis intermediagray hawksbeard, intermediate hawksbeard, limestone hawksbeard
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
Crepis modocensislow hawksbeard, Modoc hawksbeard
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
Crepis nicaeensisFrench hawksbeard, Turkish hawksbeard
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
Crepis occidentaliswestern hawksbeard
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
Crepis runcinatadandelion hawksbeard, meadow hawksbeard
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
ssp. runcinata – dandelion hawksbeard, meadow hawksbeard
Crepis setosabristly hawksbeard, rough hawksbeard
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
Crepis tectorumannual hawksbeard, narrow leaf hawksbeard, rooftop hawksbeard
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
Crocidium multicaulegold-star, spring-gold
Distribution: Occurring on both sides the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to Idaho.
Habitat: Dry, open areas from low to middle elevations, especially common in sagebrush.
Origin: Native
Flowers: March-May
Crupina vulgarisbearded creeper, crupina
Distribution: Occurring east of the Cascades crest in Washington; central and southeastern Washington to California, east to adjacent Idaho; also in eastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: April-July
Cyclachaena xanthiifoliacarelessweed, burweed marsh-elder, tall marsh-elder
Distribution: Ocurring east of the Cascades crest in Washington; British Columbia to California, east across much of North America to the Atlantic Coast.
Habitat: Bottomlands and other moist, open, often disturbed areas.
Origin: Introduced from south-central Canada and the central U.S.
Flowers: August-October
Dieteria canescenshoary-aster
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
var. incana – hoary-aster, tall hoary-aster
Eatonella niveawhite Eatonella, white false tickhead
Distribution: Occurring east of the Cascades crest in central Washington; Washington to California, east to Idaho and Nevada.
Habitat: Dry, sandy, or volcanic desert areas.
Origin: Native
Flowers: May-July
ssp. ruthenicus – southern globe thistle
Erechtites minimusAustralian bornweed, toothed coast burnweed
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Roadsides, fields, riverbanks, ditches, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced from Australia
Flowers: June-September
Ericameria bloomeriBloomer's goldenweed, rabbitbrush goldenweed
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to Idaho and Nevada.
Habitat: Dry, rocky slopes and open woods, from the foothills to moderate elevations in the mountains.
Origin: Native
Flowers: July-September
Ericameria greeneiGreene's heath goldenrod, Greene's goldenweed
Distribution: East of the Cascade crest in Washington; from northern Washington to California, and in the Wallowa Mountains of Oregon.
Habitat: Open or sparsely wooded slopes at rather high elevations in the mountains.
Origin: Native
Flowers: July-August
Ericameria nauseosacommon rabbit-brush
Distribution: Chiefly east of the Cascades in Washington; British Columbia to Oregon, east to Montana.
Habitat: Dry, open areas from the plains to moderate elevations in the mountains.
Origin: Native
Flowers: August-September
var. nana – little rabbitbrush
var. speciosa – rubber rabbitbrush
Ericameria resinosaColumbian heath goldenrod, Columbia goldenweed
Distribution: Occurring east of the Cascades crest in Washington; Washington south to Oregon, east to Idaho.
Habitat: Basalt cliffs and rock crevices in the plains and foothills, extending up to 6000 feet on the east slope of the Cascades.
Origin: Native
Flowers: July-September
Erigeron acrisbitter fleabane
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the northern Great Plains, Great Lakes region, and northeastern North America; circumboreal.
Habitat: Meadows, forest openings, and open slopes from middle elevations to the subalpine.
Origin: Native
Flowers: June-September
var. kamtschaticus – Kamchatka bitter fleabane
Erigeron aliceaeAlice's fleabane, Eastwood's fleabane
Distribution: Occurring west of the Cascades crest in the Olympic Mountains and southward in Washington; Washington to California.
Habitat: Moist to fairly dry, sandy, open areas at middle elevations in the mountains.
Origin: Native
Flowers: June-August
Erigeron annuusannual fleabane, eastern daisy fleabane, sweet scabrous fleabane
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho and Utah, not recorded for Montana, also from Great Plains east to the Atlantic.
Habitat: Moist, disturbed areas from the lowlands to middle elevations.
Origin: Native? Introduced in OR, status as a native in BC uncertain
Flowers: June-September
Erigeron aureusgolden fleabane
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Washington, east to Alberta.
Habitat: Exposed rocky areas, cliffs, and ridges in subalpine to alpine areas.
Origin: Native
Flowers: June-August.
Erigeron basalticusbasalt fleabane
Distribution: Occurring east of the Cascades crest where endemic to Kittitas and Yakima counties in Washington.
Habitat: Cliff crevices in rocky canyons.
Origin: Native
Flowers: May-July
Erigeron bloomeriBloomer's fleabane, scabland fleabane
Distribution: Occurring east of the Cascades crest in central and southeastern Washington; central Washington to California, east to Idaho and Nevada.
Habitat: Dry, open, rocky areas at low to moderate elevations
Origin: Native
Flowers: June-August
var. bloomeri – Bloomer's fleabane, scabland fleabane
Erigeron caespitosustufted fleabane
Distribution: Occurring east of the Cascades crest in Washington; Alaska to Washington, Idaho, Utah, and Arizona, east to the northern Great Plains.
Habitat: Dry, open, and often rocky places in sagebrush
Origin: Native
Flowers: June-August
Erigeron chrysopsidisdwarf yellow fleabane
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Idaho and Nevada.
Habitat: Shrub-steppe to open slopes of forests at middle elevations.
Origin: Native
Flowers: May-July
var. chrysopsidis – dwarf yellow fleabane, golden fleabane
Erigeron composituscutleaf daisy, dwarf mountain fleabane, fernleaf fleabane, trifid mountain fleabane
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the northern Great Plains, also in northern and eastern Canada.
Habitat: Sandy riverbanks at low elevations to rocky outcrops at mid- to high elevation in the mountains
Origin: Native
Flowers: May - August
Erigeron corymbosusfoothill fleabane, longleaf fleabane
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to eastern Oregon, east to Montana, Wyoming, and Utah.
Habitat: Open, usually dry places, often among sagebrush.
Origin: Native
Flowers: June-August
Erigeron davisiiDavis's daisy, Davis's fleabane
Origin: Native
Erigeron disparipilusSnake River fleabane, white cushion fleabane
Distribution: Occurring east of the Cascades crest in the Snake River area in southeastern Washington; southeastern Washington to southeastern Oregon, east to southwestern Idaho.
Habitat: Dry, rocky hillsides at low to middle elevations.
Origin: Native
Flowers: May-July
Erigeron divergens
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Great Plains of the U.S.
Habitat: Meadows, grasslands, riverbanks, and forest openings from low to middle elevations.
Origin: Native
Flowers: May-July
Erigeron eatoniiEaton's fleabane
Distribution: Occurring east of the Cascades crest in central and southeastern Washington; central Washington to California, east to the Rocky Mountains.
Habitat: Grasslands, sagebrush, dry slopes, and forest openings at low to middle elevations.
Origin: Native
Flowers: May-July
var. villosus – Eaton's shaggy fleabane
Erigeron elatusswamp fleabane
Distribution: Reported east of the Cascades crest in north-central Washington; Alaska to Washington, east across Canada to the Atlantic Coast.
Habitat: Wet meadows, edges of ponds, and forested wetlands.
Origin: Native
Flowers: July-August
Erigeron filifoliusPeck's threadleaf fleabane
Distribution: Occurring east of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to Montana, Idaho, and Utah.
Habitat: Sagebrush plains, dry slopes, and grasslands.
Origin: Native
Flowers: May-July
Erigeron flettiiFlett's fleabane, Olympic Mt. fleabane
Distribution: Occurring in the Olympic Mountains in Washington, where endemic.
Habitat: Cliffs and other rocky places in the subalpine and alpine.
Origin: Native
Flowers: June-August
Erigeron glacialisglacier fleabane
Distribution: Widely distributed in the mountains throughout Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Moist, open areas at mid- to high elevations in the mountains.
Origin: Native
Flowers: July-September
var. glacialis – subalpine fleabane
Erigeron howelliiHowell's fleabane
Distribution: Known only from Skamania County in Washington; Skamania County, WA to Clackamas and Multnomah counties in Oregon.
Habitat: Moist, rocky places in the lowlands.
Origin: Native
Flowers: April-June
Erigeron inornatusCalifornia rayless fleabane
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Nevada.
Habitat: Dry slopes and forest openings, often where sandy or rocky.
Origin: Native
Flowers: July-August
var. inornatus – California rayless fleabane
Erigeron karvinskianus
Origin: Introduced
Erigeron leibergiiLeiberg's fleabane
Distribution: Occurring east of the Cascades crest in In the Wenatchee Mountains of Okanogan, Chelan and Kittitas counties; British Columbia to Washington.
Habitat: Cliffs and rocky places at moderate to high elevations in the mountains.
Origin: Native
Flowers: June-August
Erigeron linearisdesert yellow daisy, lineleaf fleabane
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to Montana, Wyoming, and Utah.
Habitat: Dry, open, often rocky areas at low to middle elevations.
Origin: Native
Flowers: May-July
Erigeron lonchophyllusshort-rayed fleabane, spear-leaved fleabane
Distribution: Occurring east of the Cascades crest in northern Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern Canada.
Habitat: Streambanks, bogs, ponds, wet meadows, ditches, gravelly places along roads at middle to high elevations.
Origin: Native
Flowers: July-August
Erigeron nivalisnorthern daisy
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Rocky soil areas from middle elevations in the mountains to the subalpine.
Origin: Native
Flowers: June-August
Erigeron oreganusgorge daisy, Oregon fleabane
Distribution: Columbia River Gorge, more common on the Oregon side.
Habitat: Moist shady cliffs and ledges.
Origin: Native
Erigeron peregrinuswandering fleabane
Distribution: Ours the var. thompsonii, which is endemic to the Olympic Peninsula. Most of the counties and specimen localities displayed here refer to Erigeron peregrinus var. peregrinus specimens, which is a misapplication of this name to what we now call Erigeron glacialis ssp. glacialis.
Habitat: Montane forests to subalpine meadows and bogs.
Origin: Native
Flowers: June-August
var. thompsonii – Thompson's wandering fleabane
Erigeron philadelphicusPhiladelphia daisy, Philadelphia fleabane
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Moist, open forests at low to mid-elevations.
Origin: Native
Flowers: April-August
var. philadelphicus – Philadelphia daisy, Philadelphia fleabane
Erigeron piperianusPiper's fleabane
Distribution: Columbia plains of south-central and southeast Washington
Habitat: Dry, open places, often in sandy soil among sagebrush.
Origin: Native
Flowers: May - June
Erigeron poliospermushairy-seeded daisy, cushion fleabane
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to western Idaho.
Habitat: Dry, open, typically rocky areas, often with sagebrush.
Origin: Native
Flowers: April-June
var. cereus – Kittitas fleabane
var. poliospermus – hairy seeded daisy, cushion fleabane
Erigeron pumilusshaggy fleabane
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Great Plains.
Habitat: Open places in the foothills, valleys and plains, often among sagebrush.
Origin: Native
Flowers: May-July
var. intermedius – shaggy fleabane
var. pumilus – shaggy fleabane
Erigeron salishiiSalish daisy, star peak fleabane
Distribution: British Columbia and Washington.
Habitat: Cliffs, ridges, ledges and gravelly slopes at mid- to high elevations in the mountains.
Origin: Native
Flowers: July - September
Erigeron speciosusshowy daisy, showy fleabane, splendid fleabane
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon, Nevada, and Arizona, east to the Rocky Mountains and northern Great Plains.
Habitat: Prairies and forest openings from the lowlands to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Erigeron strigosusbranched daisy, daisy fleabane
Distribution: Widely distributed in Washington; widespread throughout much of North America.
Habitat: Moderately dry places at low to moderate elevations.
Origin: Native
Flowers: May-October
var. septentrionalis – prairie fleabane
var. strigosus – branching daisy, daisy fleabane
Erigeron subtrinervisthree-veined fleabane
Distribution: Washington to the Dakotas, south to Colorado, but not found in Oregon
Habitat: Moderately dry, open places at moderate to mid-elevations in the mountains
Origin: Native
Flowers: July - August
Eriophyllum lanatumcommon woolly sunflower
Distribution: Widely distributed throughout Washington; British Columbia to California, east Montana, Wyoming, and Utah.
Habitat: Dry, open, often rocky areas at low to mid-elevations.
Origin: Native
Flowers: May-August
var. integrifolium – Oregon sunshine
var. lanatum – common eriophyllum, common wooly sunflower
Eucephalus engelmanniiEngelmann's aster
Distribution: Distributed on both sides of the Cascades in Washington; British Columbia south to Nevada, east to Alberta and south to Colorado.
Habitat: Open woods, foothills to high elevations in the mountains.
Origin: Native
Flowers: June-September
Eucephalus glaucescensKlickitat aster
Distribution: Occurring on both sides of the Cascades crest in Washington; endemic (only occurring in) Washington.
Habitat: Forest openings and meadows at low to moderate elevations.
Origin: Native
Flowers: July-October
Eucephalus ledophyllusCascade aster
Distribution: Cascade Mountains from northern Washington to southern Oregon.
Habitat: Meadows and open woods, mid-elevations up to timberline in the mountains.
Origin: Native
Flowers: July-September
var. ledophyllus – Cascade aster
Eucephalus paucicapitatusOlympic Mountain aster
Distribution: Olympic Mountains of Washington and Vancouver Island, British Columbia.
Habitat: Open slopes, mid- to high elevations.
Origin: Native
Flowers: July-September
Eurybia conspicuashowy aster, western showy aster, eastern showy wood-aster
Distribution: Northeast Oregon and eastern Washington, east to Wyoming and north to Saskatchewan
Habitat: Open woods, foothills to mid-elevations in the mountains
Origin: Native
Flowers: July - September
Eurybia integrifoliathick stemmed aster
Distribution: Occurring in the northeastern and southeastern regions of Washington; Washington south to California, east to Montana, Wyoming, and Utah.
Habitat: Dry meadows, open coniferous forests, and riparian areas at mid to higher elevations.
Origin: Native
Flowers: June-September
Eurybia meritaarctic aster, Behring wood aster, Siberian aster, subalpine aster
Origin: Native
Flowers: July - August
Eurybia radulinarough leaved aster
Distribution: Chiefly on the east side of the Cascades in Washington from low to moderate elevations; south to central California.
Habitat: Open woods.
Origin: Native
Flowers: July-September
Eurybia sibiricaarctic aster, Behring wood aster, Siberian aster, Siberian wood-aster
Distribution: Circumboreal; found in northern Rocky mountains, Pacific Northwest, and northward through Alberta, British Columbia, Yukon and Northwest Territories, and Alaska.
Habitat: In Washington, this species is found in alpine and subalpine meadows.
Origin: Native
Flowers: July - August
Euthamia graminifoliafragrant goldenrod, grass leaved goldenrod
Origin: Native
Euthamia occidentaliswestern goldenrod, western goldentop
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains and Great Plains of the U.S.
Habitat: Low, ususally moist ground in the valleys and plains.
Origin: Native
Flowers: July-October
Eutrochium maculatumspotted Joe-pye weed
Distribution: Known only from Whatcom County in Washington; Southern British Columbia to Washington, east across the Rocky Mountains and Great Plains to the Atlantic Coast.
Habitat: Swamps and other moist, open places, from sea level to the high plains.
Origin: Native
Flowers: July-September
var. bruneri – joe-pye weed, joepyeweed
Filago arvensisfield cottonrose, cudweed, field filago, field cotton rose
Distribution: Occurring east of the Cascades crest in Washington; Alaska to Oregon, east to Sasketchewan, Nebraska, Minnesota and Michigan.
Habitat: Dry, open waste land and overgrazed ranges.
Origin: Introduced
Flowers: July-September
Filago vulgarisGerman filago
Origin: Introduced from Europe
Gaillardia aristatablanket flower, great flowered gaillardia
Distribution: Chiefly east of the Cascades in Washington; British Columbia south to Oregon.
Habitat: Dry, open areas at low to mid-elevations.
Origin: Native
Flowers: May-September
Galinsoga parviflora
Distribution: Sparingly introduced in Klickitat County.
Habitat: Waste places
Origin: Introduced from Central and South America
Flowers: June-October
var. parviflora – small flowered galinsoga, gallant soldier
Galinsoga quadriradiataciliate galinsoga, shaggy galinsoga, quickweed, shaggy soldier
Distribution: Introduced and sparingly established in western Washington; occurring throughout most of North America except intermountain west from Idaho to Texas.
Habitat: Gardens and waste places.
Origin: Introduced from Central and South America
Flowers: June-October
Gamochaeta ustulatapurple cudweed, spoon-leaf cudweed
Distribution: Widespread west of the Cascades in Washington; British Columbia south to California.
Habitat: Usually in sandy soil, often in disturbed areas.
Origin: Native
Flowers: May-October
Gnaphalium palustrelowland cudweed, western marsh cudweed
Distribution: Widely distributed throughout Washington; British Columbia south to California, east to the Great Plains.
Habitat: Open areas at low elevations where moist at least in spring.
Origin: Native
Flowers: May-October
Gnaphalium uliginosummarsh cudweed
Distribution: Widespread throughout Washington; Alaska south to Oregon, east across the central U.S. and Canada to the Atlantic Coast.
Habitat: Moist areas, streambanks and waste ground.
Origin: Introduced
Flowers: July-October
Grindelia hirsutulaColumbia gumplant, Oregon gumplant, coastal gumweed, Columbia gumweed, Idaho gumweed, low gumweed, resinweed
Distribution: From the coast to mid elevations; both sides of the Cascades in Washington. British Columbia south to California, east to New York and Quebec.
Habitat: Coastal bluffs, forest openings, alluvial areas, disturbed sites.
Origin: Native
Flowers: May-October
Grindelia integrifoliaPuget Sound gumweed, Willamette Valley gumweed
Distribution: Occurring west of the Cascades crest in Washington at low elevations; British Columbia to northern California.
Habitat: Salt marshes, rocky shores along the coast, coastal headlands and bluffs, and various non-maritime habitats in the Puget Trough.
Origin: Native
Flowers: June-March
Grindelia squarrosacurlycup gumweed, serrate resinweed
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east across southern Canada and most of the United States to the Atlantic Coast.
Habitat: Dry, open, often sandy places, at low elevations.
Origin: Introduced
Flowers: June-September
Guizotia abyssinica
Distribution: Eastern portion of Washington; California and scattered areas of central and eastern North America.
Habitat: Disturbed sites at low elevations.
Origin: Introduced
Flowers: June-September
Gutierrezia sarothraekindlingweed, matchweed, broom snakeweed
Distribution: East of the Cascades in Washington, chiefly in southeastern part of state; Alberta to Manitoba, south to California and Texas.
Habitat: Dry, open places in the foothills, valleys and plains.
Origin: Native
Flowers: July-September
Helenium autumnalecommon sneezeweed, large flowered sneezeweed, mountain sneezweed
Distribution: British Columbia to Quebec, south to Arizona and Florida
Habitat: Stream banks and other moist, low ground in the valleys and foothills.
Origin: Native
Flowers: July - September
Helianthella unifloraRocky Mountain helianthella
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
var. douglasii – Douglas helianthella, false sunflower
Helianthus annuuscommon sunflower
Distribution: Occurring chiefly east of the Cascades in Washington, but also on west side where escaped from cultivation.
Habitat: Open, dry to moderately moist soil; foothills, valleys and waste land.
Origin: Native and introduced populations in Washington
Flowers: June-September
Helianthus ciliaris
Origin: Introduced
Helianthus cusickiiCusick's sunflower, turniproot sunflower
Distribution: In Washington, from Chelan County south between the Cascades and the Columbia River, eastern Oregon and adjacent Idaho, and northeastern California.
Habitat: Dry, open plains and foothills.
Origin: Native
Flowers: April - August
Helianthus grosseserratussawtooth sunflower
Origin: Introduced from eastern North America along railroads at Bingen and near Spokane
Helianthus maximilianinarrow leaved sunflower
Distribution: Introduced from east of the Rockies to British Columbia, Idaho, and eastern Washington.
Habitat: Dry, open places, often on waste ground.
Origin: Introduced
Flowers: July-September
Helianthus nuttalliiNuttall's sunflower
Distribution: Chiefly east of the Cascades: Western and Mid-western United States and adjacent Canada
Habitat: Meadows and other moist places, low to moderate elevations in the mountains
Origin: Native
Flowers: July - September
ssp. nuttallii – cordilleran sunflower, Nuttall's sunflower
Helianthus petiolarisprairie sunflower
Origin: Introduced from further east
Flowers: June - September
Helianthus tuberosusJerusalem artichoke
Distribution: Introdued and widespread in eastern United States; uncommon in the Pacific Northwest.
Habitat: Moist soil and waste places.
Origin: Introduced
Flowers: August - October
Hemizonella minimasmallhead tarplant, least tarweed, small-head tarweed, smallhead tarweed
Distribution: Both sides of the Cascades in Washington; southern British Columbia south to California, east to northern Idaho.
Habitat: Dry, open ponderosa pine woods and prairies.
Origin: Native
Flowers: May-July
Heterotheca oregonaOregon goldenaster
Distribution: British Columbia to California, east base of the Cascades to the coast.
Habitat: Sand and gravel bars along rivers, low to moderate elevations.
Origin: Native
Flowers: June-Sept.
Heterotheca villosahairy goldaster
Distribution: Widespread in Washington and Oregon, chiefly east of the Cascades; east to Michigan
Habitat: Open, sunny areas, often in sandy soil, low to moderate elevations
Origin: Native
Flowers: June-September
var. foliosa – leafy goldenaster
var. minor – hairy goldenaster, hispid goldenaster
var. villosa – hairy goldaster, hairy goldenaster
Hieracium albiflorumwhite flowered hawkweed, white hawkweed
Distribution: British Columbia to California, east to Colorado
Habitat: Open woods at moderate to mid-elevations in the mountains.
Origin: Native
Flowers: June - August
Hieracium aurantiacumorange hawkweed
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
Hieracium caespitosumyellow king devil, meadow hawkweed
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia south to Washington, east to Idaho, Montana, and Wyoming; also occurring throughout eastern North America.
Habitat: Moist places from the lowlands to moderate elevations in the mountains, usually where the soil has been disturbed.
Origin: Introduced from Europe
Flowers: June-August
Hieracium flagellarewhip hawkweed
Origin: Introduced from Europe
Hieracium ×floribundumflowery hawkweed
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
Hieracium glomeratumyellow devil hawkweed
Origin: Introduced
Hieracium lachenaliicommon hawkweed, English hawkweed, European hawkweed
Distribution: Uncommon introduction west of the Cascades in Washington and Oregon
Habitat: Disturbed areas
Origin: Introduced from Europe
Flowers: June - August
Hieracium longiberbelong bearded hawkweed
Distribution: Columbia River Gorge, Washington and Oregon.
Habitat: Hillsides and rock crevices.
Origin: Native
Flowers: June - July
Hieracium maculatummottled hawkweed
Origin: Introduced from Europe
Hieracium murorumwall hawkweed
Distribution: In scattered locations in lowland western Washington; British Columbia south to Washington; occurring throughout northeastern North America.
Habitat: Distrurbed areas and forest edge.
Origin: Introduced from Europe
Flowers: April-June
Hieracium pilosellamouse ear hawkweed
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to Oregon; northeastern North America.
Habitat: Disturbed areas, forest openings, prairies, meadows, and roadsides.
Origin: Introduced from Europe
Flowers: June-August
Hieracium piloselloidestall hawkweed
Origin: Introduced from Europe
Hieracium sabaudumsavoy hawkweed
Origin: Introduced from Europe
Hieracium scoulerihound tongue hawkweed, Scouler's hawkweed, woolly weed
Distribution: Widely distributed throughout Washington; British Columbia south to California, chiefly in the Cascade-Sierra Nevada region.
Habitat: Mostly dry places in open woods, foothills to moderate or sometimes higher elevations in the mountains.
Origin: Native
Flowers: June-August
Hieracium stoloniflorumforked hawkweed
Origin: Introduced from Europe
Hieracium tristealpine hawkweed, slender hawkweed
Distribution: Occurring throughout the mountainous areas in Washington; Alaska south to California, east 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
Hieracium umbellatumnarrowleaf hawkweed, umbellate hawkweed
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska south to northwest 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
Hulsea nanadwarf alpinegold, dwarf hulsea
Distribution: Known from the Mt. Rainier and Mt. Adams area in Washington; Washington south to California.
Habitat: Generally around volcanic mountains above timberline.
Origin: Native
Flowers: July-September
Hymenopappus filifoliusColumbia cut-leaf, fineleaf hymenopappus
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to the Great Plains of Canada and the U.S.
Habitat: Dry, often sandy places in the foothills and plains.
Origin: Native
Flowers: May-July
var. filifolius – Columbia cutleaf
Hypochaeris glabrasmooth cat's-ear
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California, also from Texas to the northeastern U.S.
Habitat: Roadsides, rocky balds, meadows, wastelots, and other disturbed open areas at low elevations, often where sandy.
Origin: Introduced from Europe
Flowers: May-June
Hypochaeris radicatahairy cat's-ear, rough cat's-ear
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, and further east across most of North America to the Atlantic Coast.
Habitat: Disturbed areas, grassy balds, prairies, grasslands, lawns, and roadsides.
Origin: Introduced from Europe
Flowers: May-October
Inula heleniumelecampane, inula
Distribution: Known in Washington from a single location east of the Cascades crest in Washington; British Columbia to California, also in central and eastern North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced from Asia
Flowers: June-September
Ionactis stenomeresRocky Mountain ankle-aster, Rocky Mountain aster
Distribution: Southeast British Columbia and northeast Washington, and adjacent Idaho and Montana.
Habitat: Open hillsides and forest openings, moderate to fairly high elevations in the mountains.
Origin: Native
Flowers: Late June - Early September
Iva axillarisdeeproot, deer root, poverty weed
Distribution: Chiefly east of the Castades, southern British Columbia to California, east to Manitoba and Oklahoma.
Habitat: Dry, often alkaline places, in the valleys, plains and foothills.
Origin: Native
Flowers: May - September
Jacobaea maritimasilver ragwort
Origin: Introduced
Jacobaea vulgaristansy ragwort
Distribution: Widely distributed on both sides of the Cascades in Washington; British Columbia to California, east to Montana, also in eastern North America.
Habitat: Roadsides, fields, pastures, forest edges, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: June-September
Jaumea carnosafleshy jaumea, marsh jaumea
Distribution: Coastal, southern Vancouver Island, British Columbia, to southern California.
Habitat: Tidal flats and marshes.
Origin: Native
Flowers: July - September
Lactuca biennistall blue lettuce, wild blue lettuce
Distribution: Alaska to Newfoundland, south to California and North Carolina.
Habitat: Moist places.
Origin: Native
Flowers: July - August
Lactuca canadensisCanadian wild lettuce, Florida blue lettuce
Distribution: Widespread in eastern United States; occasionally introduced in the Pacific Northwest.
Habitat: Fields, woodlands and waste places.
Origin: Introduced from eastern North America
Flowers: July - September
Lactuca ludovicianaLouisiana lettuce, prairie lettuce, western lettuce
Origin: Introduced
Flowers: July - September
Lactuca salignaleast lettuce, willow lettuce
Distribution: Occurring in scattered locations in Washington; Washington south to California, east across the southwestern U.S. to the central U.S. and northeastern North America.
Habitat: Disturbed areas, roadsides, and meadows.
Origin: Introduced
Flowers: August-October
Lactuca sativagarden lettuce
Distribution: Occurring in scattered locations in Washington; Washington south to California, east to Idaho; in scattered locations in the central U.S., more commonly distributed in eastern North America.
Habitat: Disturbed areas, often escaping from cultivation.
Origin: Introduced
Flowers: July-September
Lactuca serriolaprickly lettuce
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Roadsides, fields, forest edge, wastelots, and other disturbed places.
Origin: Introduced from Europe
Flowers: July-September
Lactuca tataricablue lettuce
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Great Plains, Great Lakes region, and northeastern North America.
Habitat: Meadows, thickets, and other moist places at low to middle elevations.
Origin: Native
Flowers: June-September
ssp. pulchella – blue lettuce
Lactuca virosagreat lettuce, tall lettuce, wild lettuce
Distribution: Occurring west of the Cascades crest in lowland areas in Washington; also in California, Mississippi, and Maryland.
Habitat: Roadsides, ditches, sidewalks, wastelots, and other disturbed, open areas at low elevations.
Origin: Introduced from Europe
Flowers: May-October
Lagophylla ramosissimaslender hareleaf, common rabbitleaf
Distribution: Occurring east of the Cascades in Washington; Washington south to California, east to Montana, Idaho, and Nevada.
Habitat: Dry, open areas of foothills and plains.
Origin: Native
Flowers: May-July
Lapsana communiscommon nipplewort
Distribution: Occurring on both sides of the Cascades crest in Washington, but more often west of the crest; Alaska to California, east across much of North America to the Atlantic Coast.
Habitat: Disturbed areas including roadsides, wastelots, fields, and forest edge.
Origin: Introduced from Eurasia
Flowers: May-July
Lasthenia glaberrimasmooth goldfields, smooth lasthenia
Distribution: West of the Cascades, southwest Washington south to central California.
Habitat: Wet or muddy ground at low elevations, including venral pools.
Origin: Native
Flowers: May-July
Lasthenia maritimamaritime goldfields, seaside goldfields
Distribution: Coastal southern British Columbia to California.
Habitat: Rocky beaches.
Origin: Native
Lasthenia minorcoastal goldfields
Origin: Native
Layia glandulosawhite layia, white daisy tidytips
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Idaho, Utah, Arizona and New Mexico.
Habitat: Dry, open areas from sagebrush desert to low elevations in the mountains.
Origin: Native
Flowers: April-June
Leontodon autumnalisautumn hawkbit
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
Leontodon saxatilishairy hawkbit
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia south to California, Nevada, and Arizona, also in central and eastern North America.
Habitat: Roadsides, wastelots, meadows, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: July-September
ssp. saxatilis – lesser hawkbit
Leucanthemum ×superbumShasta daisy
Distribution: Occurring in lowlands in western Washington; British Columbia to Oregon, also in eastern North America.
Habitat: Disturbed areas where often escaped from cultivation.
Origin: Introduced
Flowers: May-August
Leucanthemum vulgareoxeye daisy
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Open, disturbed areas including roadsides, pastures, prairies, grasslands and wastelots.
Origin: Introduced from Eurasia
Flowers: May-October
Logfia gallicadaggerleaf cottonweed
Origin: Introduced
Logfia minimalittle cottonrose, small cudweed
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to Oregon, also in eastern North America.
Habitat: Heaths, sandy soils, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: June-Sept.
Luina hypoleucalittleleaf luina, silverback luina, littleleaf silverback
Distribution: In the Olympic and Cascade mountains in Washington; British Columbia south to California.
Habitat: Open, rocky areas, moist to somewhat dry, moderate to high elevations in the mountains.
Origin: Native
Flowers: June-October
Lygodesmia juncearush skeletonplant
Distribution: Known from Spokane County in Washington; southeastern British Columbia to eastern Washington, Idaho and Nevada, east to Great Plains and Great Lakes region.
Habitat: Dry, open places, often in sandy soil.
Origin: Native
Flowers: June-September
Madia citriodoralemon scented tarplant, lemon scented tarweed, lemon tarweed
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Nevada.
Habitat: Dry, open hillsides and foothills.
Origin: Native
Flowers: May-June
Madia eleganscommon madia, autumn showy tarweed
Distribution: Southwest Washington, south through western Oregon to California.
Habitat: Dry, open places, often becoming a roadside weed.
Origin: Native
Flowers: July - September
Madia exiguathreadstem madia, little tarplant, little tarweed
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common east of the crest; British Columbia to California, east to Montana, Idaho, and Nevada.
Habitat: Dry, open woods, grasslands, roadsides, and other open areas where often disturbed, from the plains and foothills, occasionally up to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Madia glomeratamountain tarplant, cluster tarweed, mountain tarweed
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to south to California, east to the Rocky Mountains and across northern U.S. and southern Canada to the Atlantic Coast.
Habitat: Common in dry, open places from the foothills to mid-elevations in the mountains.
Origin: Native
Flowers: July-September
Madia gracilisgrassy tarplant, common tarweed, slender tarweed
Distribution: Widely distributed throughout Washington; British Columbia south to California, east to Montana, Idaho, Nevada, and Utah.
Habitat: Dry, open areas from shrub-steppe to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Madia sativaChilean tarplant, coast tarweed
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California.
Habitat: Dry, open places at low elevations, often along roadsides or other disturbed sites.
Origin: Native
Flowers: June-September
Matricaria chamomillawild chamomile, scented mayweed
Distribution: Widespread across the United States and southern Canada.
Habitat: Roadsides, dry waste sites.
Origin: Introduced
Flowers: Late April - June
Matricaria discoideapineapple weed
Distribution: Widely distributed throughout Washington; widely distributed throughout much of North America.
Habitat: Disturbed areas, moist to dry.
Origin: Native
Flowers: May-September
Micropus californicuscottontop, Q-tips
Distribution: Occurring east of the Cascades crest in south-central Washington; Washington to California.
Habitat: Dry, open areas at low to moderate elevations.
Origin: Native
Flowers: April-May
var. californicus – cottontop, Q-tips
Microseris bigeloviicoast microseris, coastal silverpuffs
Origin: Native
Flowers: May - June
Microseris borealisapargidium, bog microseris, northern silverpuffs
Distribution: Occurring west of the Cascades crest in Washington; southern Alaska south to northern California.
Habitat: Sphagnum bogs and wet meadows in the mountains.
Origin: Native
Flowers: June-August
Microseris laciniatacut-leaved microseris
Distribution: Washington to California, from the eastern foothills of the Cascades to the coast.
Habitat: Usually in fairly moist meadows.
Origin: Native
Flowers: May - July
ssp. laciniata – cutleaf microseris, cut leaved scorzonella
ssp. leptosepala – cut-leaved silverpuffs, cutleaf silverpuffs
Microseris nutansnodding microseris, nodding scorzonella, nodding silverpuffs
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Slopes, meadows, flats, and forest openings,often in somewhat moist places, from low to middle elevations.
Origin: Native
Flowers: April-July
Mycelis muraliswall lettuce
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common on the west side; British Columbia to Oregon; eastern North America.
Habitat: Roadsides and waste ground from the lowlands to mid-elevations in the mountains.
Origin: Introduced from Europe
Flowers: July-September
Nabalus alatuswestern white lettuce, western rattlesnakeroot
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; Alaska to Oregon, east to Alberta, Idaho, and Montana.
Habitat: Streambanks, forest edge, and moist, shaded places from the lowlands to middle elevations in the mountains.
Origin: Native
Flowers: July-September
Nestotus stenophyllusnarrowleaf goldenweed
Distribution: Occurring east of the Cascades crest in central Washington; Washington to California, east to Idaho and Nevada.
Habitat: Dry, rocky soil, often with sagebrush.
Origin: Native
Flowers: May-July
Nothocalais alpestrisalpine lake agoseris
Distribution: In the Cascades of Washington, mostly from Mt. Rainier south; Washington south to California.
Habitat: Open slopes and meadows from mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Nothocalais troximoidesweevil prairie dandelion, false agoseris
Distribution: East of the Caascades crest in Washington; British Columbia south to California, east to Montana, Wyoming and Utah.
Habitat: Dry, open areas in lowlands and foothills, especially in lithosol.
Origin: Native
Flowers: April-June
Onopordum acanthiumcotton thistle, Scotch thistle, Scots thistle
Distribution: Chiefly east of the Cascades in Washington, but also on the west side; introduced throughout nearly all of North America.
Habitat: Noxious weed of dry, open areas and stream banks.
Origin: Introduced from Eurasia
Flowers: June-August
Oreostemma alpigenum
Distribution: Alpine areas of Olympic and Cascade Mountains; British Columbia to California, east to Wyoming.
Habitat: High mountain meadows.
Origin: Native
Flowers: June-September
var. alpigenum – alpine aster, tundra mountaincrown
Packera bolanderiBolander's groundsel
Distribution: Along the coast from the estuary of the Columbia River to California.
Habitat: Bluffs, woodlands and beaches.
Origin: Native
Flowers: June-July
var. harfordii – Harford's ragwort
Packera canawoolly groundsel
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Saskatchewan and Nebraska.
Habitat: Dry, open, often rocky places, from the foothills to above timberline.
Origin: Native
Flowers: May-August
Packera conterminadwarf arctic butterweed
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Washington, east to Alberta and Montana.
Habitat: Open, rocky areas in the high mountains.
Origin: Native
Flowers: July-September
Packera flettiiFlett's groundsel
Distribution: From the foothills to the tops of the Olympic Mountains in Washington, and also at high elevations in the Cascades in the vicinity of Mount Rainier.
Habitat: Open, rocky places, especilly on talus slopes.
Origin: Native
Flowers: June - August
Packera indecorarayless mountain butterweed, elegant groundsel, rayless mountain groundsel
Distribution: Alaska to Washington, east to Montana
Habitat: Uncommon in moist woods and on stream banks, moderate elevations in the mountains
Origin: Native
Flowers: July - August
Packera macouniiPuget butterweed, long rayed groundsel, Macoun's groundsel, Siskiyou Mountain ragwort
Distribution: West of the Cascades, British Columbia to southern Oregon, mostly in the Puget Trough.
Habitat: Open woods and dry, open places.
Origin: Native
Flowers: May - July
Packera pauciflorarayless alpine butterweed, rayless alpine groundsel
Distribution: Alaska, east across Canada to Labrador, south to northern Washington and Idaho.
Habitat: Alpine and sub-alpine meadows and moist cliffs.
Origin: Native
Flowers: July - August
Packera pauperculaCanadian butterweed, balsam groundsel
Distribution: Occurring east of the Cascades in Washington; British Columbia south to Oregon and New Mexico, east to Labrador and Virginia.
Habitat: Meadows, moist cilffs and woods, foothills to moderate elevations in the mountains.
Origin: Native
Flowers: May-October
Packera porteriPorter's groundsel
Origin: Native
Packera pseudaureastreambank butterweed
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to central Canada and midwestern U.S.
Habitat: Wet meadows, stream-banks and moist woodlands at moderate to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
var. pseudaurea – streambank butterweed, falsegold groundsel
Packera streptanthifoliaRocky Mountain butterweed, cleftleaf groundsel, Rocky Mountain groundsel
Distribution: Alaska to California, east to Colorado
Habitat: Moist to moderately dry open areas and woods, mid- to high elevations in the mountains
Origin: Native
Packera subnudaalpine meadow butterweed, few-leaved groundsel
Distribution: Occurring in the Cascade Mountains of Washington; Washington south to California, east to Montana and Wyoming.
Habitat: Alpine and subalpine wet meadows.
Origin: Native
Flowers: July-September.
var. subnuda – cleftleaf groundsel
Petasites frigidusalpine butterbur, sweet coltsfoot
Distribution: Occurring in forested and mountainous areas throughout Washington; Alaska to California, east across the northern half of North America to the Atlantic Coast; circumboreal.
Habitat: Meadows, swamps, and other wet places, from low elevations to the alpine.
Origin: Native
Flowers: March-August
var. frigidus – alpine butterbur, arctic butterbur, sweet coltsfoot
var. palmatus – western coltsfoot
var. sagittatus – arrowhead sweet coltsfoot, arrowleaf coltsfoot
var. ×vitifolius – hybrid coltsfoot, Wenatchee coltsfoot
Petasites japonicusJapanese coltsfoot
Distribution: Sparingly introduced in Washington
Habitat: Escaped from cultivation
Origin: Introduced
var. giganteus – Japanese sweet coltsfoot
var. japonicus – Japanese sweet coltsfoot
Picris hieracioideshawkweed oxtongue
Origin: Introduced from Europe
Pleiacanthus spinosusthorny skeletonweed
Origin: Introduced?
Pseudognaphalium californicumCalifornia cudweed, California everlasting, ladies tobacco, ladies' tobacco
Origin: Native
Flowers: June - July
Pseudognaphalium luteoalbumweedy cudweed, red-tip rabbit-tobacco, jersey rabbit tobacco
Distribution: Locally introduced, chiefly west of the Cascades.
Habitat: Disturbed waste ground.
Origin: Introduced
Flowers: June - October
Pseudognaphalium macouniisticky cudweed, winded cudweed, Macoun's rabbit-tobacco, Macoun's rabbit tobacco
Origin: Native
Pseudognaphalium stramineumcotton batting cudweed
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to the Great Plains of the U.S.; also in scattered states along the Atlantic Coast.
Habitat: Open, usually moist places, often in disturbed soil.
Origin: Native
Flowers: June-October
Pseudognaphalium thermaleslender cudweed, northwestern rabbit-tobacco
Distribution: Occurring on both sides of the Cascades crest in Washingotn; British Columbia south to California, east to Montana and Utah.
Habitat: Dry, sandy banks and ditches, open woods of ponderosa pine and Douglas fir, and mixed deciduous forests.
Origin: Native
Flowers: June-September
Psilocarphus brevissimusdwarf woolly-marbles
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Dried beds of vernal pools.
Origin: Native
Flowers: May-July
var. brevissimus – dwarf woollyheads
Psilocarphus elatiortall woollyheads
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho and Montana.
Habitat: Dried beds of vernal pools and other open, moist places.
Origin: Native
Flowers: May-August
Psilocarphus oregonusOregon woollyheads
Distribution: Occurring east of the Cascades in Washington; Washington south to California, east to Idaho and Nevada.
Habitat: Dried beds of vernal pools.
Origin: Native
Flowers: May-July
Psilocarphus tenellusslender woollyheads
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho.
Habitat: Dry or seasonally moist barren or wooded slopes or flats, often on disturbed sites.
Origin: Native
Flowers: March-August
Pyrrocoma carthamoideslarge-flowered goldenweed
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Idaho, Montana, Wyoming, and Nevada.
Habitat: Open hillsides and meadows, from the valleys and plains to moderate elevations in the mountains.
Origin: Native
Flowers: July-August
var. carthamoides – Columbia goldenweed, rayless goldenweed
var. cusickii – narrowhead goldenweed
Pyrrocoma hirtahairy goldenweed, sticky goldenweed
Distribution: Mountains of central Washington, and the mountains of northeast Oregon and adjacent Washington and Idaho, south to northeast California.
Habitat: Meadows and open or sparsely wooded slopes in the foothills to moderate elevations in the mountains.
Origin: Native
Flowers: July - August
var. sonchifolia – large sticky goldenweed
Pyrrocoma liatriformisPalouse goldenweed
Distribution: Occurring in the Palouse region of southeastern Washington.
Habitat: Grassy hillsides and prairies.
Origin: Native
Flowers: July-August
Pyrrocoma scaberulapalouse goldenweed
Distribution: Occurring in the southeastern corner of Washington, northeast Oregon and into Idaho.
Habitat: Grasslands and open hillsides at low to mid elevations.
Origin: Native
Flowers: July-August
Rainiera strictatongue leaved luina, Rainiera, false silverback
Distribution: Occurring on both sides of the Cascades crest in south-central Washington; Washington south to Oregon.
Habitat: Meadows and moist, open hillsides at mid- to high elevations in the mountains.
Origin: Native
Flowers: July-August
Ratibida columniferaprairie coneflower, redspike Mexican-hat, Upright prairie coneflower
Distribution: Southeast British Columbia and Montana, east to Minnesota and south to Texas.
Habitat: Prairies, plains and waste ground.
Origin: Introduced
Flowers: June-August
Rhaponticum repenshardheads, creeping knapweed, Russian knapweed
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
Rigiopappus leptocladusbristlehead, false wireweed
Distribution: Pacific Northwest to Utah and California; chiefly east of the Columbia River in Washington
Habitat: Dry, open areas at low elevations; sagebrush and grasslands areas
Origin: Native
Flowers: April - June
Rudbeckia alpicolashowy coneflower, Washington showy coneflower, Wenatchee Mountain showy coneflower
Distribution: Endemic to the Wenatchee Mountains east of the Cascades crest in Washington.
Habitat: Thickets, bogs, and along streams in the mountains.
Origin: Native
Flowers: June-August
Rudbeckia hirta
Distribution: Found in most of the United States, but native in the central states and introduced in the Pacific Northwest.
Habitat: Open meadows and disturbed places.
Origin: Introduced from farther east in United States
Flowers: June - August
var. pulcherrima – blackeyed Susan
Rudbeckia laciniatagreen-headed coneflower, tall coneflower
Distribution: Montana and southern Idaho, east to Quebec, then south to Florida.
Habitat: Streambanks and other moist places.
Origin: Introduced from farther east in United States
Flowers: July - September
var. ampla – tall coneflower
Rudbeckia occidentaliswestern chocolate come, western coneflower
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington south to California, east to the Rocky Mountains.
Habitat: Moist openings in forests at moderate to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Saussurea americanaAmerican sawwort
Distribution: Occurring in the Olympic and Cascade Mountains of Washington; Yukon Territory south to California, east to Alberta, Montana, and Idaho.
Habitat: Meadows and open, often rocky slopes, where moist, at mid- to high elevations in the mountains.
Origin: Native
Flowers: July-September
Senecio elmeriElmer's ragwort
Distribution: Occurring in the Cascade and Wenatchee Mountains of central and northern Washington; British Columbia south to Washington.
Habitat: Talus slopes and other rocky places in alpine areas.
Origin: Native
Flowers: July-September
Senecio fremontiidwarf mountain butterweed
Distribution: British Columbia to California, east to Colorado
Habitat: Open, rocky slopes at high elevations in the mountains
Origin: Native
Flowers: July - September
var. fremontii – dwarf mountain groundsel
Senecio hydrophiloidessweet marsh butterweed, stout meadow groundsel
Distribution: East of the Cascades, Okanogan County and adjacent British Columbia, south to eastern Oregon and east to western Montana.
Habitat: Wet meadows in the mountains and foothills, but not in alkali.
Origin: Native
Flowers: May - July
Senecio hydrophilusalkali marsh butterweed, water groundsel, alkali marsh ragwort
Distribution: East of the Cascades, British Columbia to California, east to South Dakota and Colorado.
Habitat: Swampy places in the valleys and foothills; tolerant of alkali.
Origin: Native
Flowers: June- September
Senecio integerrimusone-stemmed butterweed, western groundsel
Distribution: Occurring chiefly east of the Cascades crest in Washington, where widely distributed; British Columbia to California, east to the Great Plains and Great Lakes region.
Habitat: Meadows and seasonally moist open areas from low elevations to the subalpine.
Origin: Native
Flowers: May-July
var. exaltatus – one-stemmed butterweed, lambs-tongue groundsel, tall western groundsel
var. ochroleucus – white western groundsel
Senecio lugensblack-tipped groundsel
Distribution: Alaska and Yukon, south to the Olympic Mountains and the northern mountains in Wyoming; reported in Okanogan County, but otherwise not known in the Cascades.
Habitat: Wet meadows, grassy alpine slopes and rich northern woods.
Origin: Native
Flowers: July - August
Senecio neowebsteriOlympic Mountain ragwort
Distribution: Olympic Mountains of Washington at high elevations.
Habitat: Talus slopes and rocky places.
Origin: Native
Flowers: Aug.-Sept.
Senecio serratall butterweed, butterweed groundsel
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington south to California, east to the Rocky Mountains north of Arizona and New Mexico.
Habitat: Meadows and open, moist hillsides, foothills to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
var. serra – tall butterweed, butterweed groundsel
Senecio sylvaticuswood groundsel, woodland groundsel, woodland ragwort
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, also in eastern North America.
Habitat: Disturbed ground at low elevations.
Origin: Introduced from Europe
Flowers: May-September
Senecio triangularisarrowleaf groundsel, arrowleaf ragwort
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains.
Habitat: Moist places and streambanks, moderate to high elevations in the mountains, and low elvations west of the Cascades.
Origin: Native
Flowers: June-September
Senecio viscosussticky ragwort
Origin: Introduced
Senecio vulgariscommon groundsel, old man in the spring
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Roadsides, waste ground, lawns, and other disturbed, open sites.
Origin: Introduced from Europe
Flowers: February-May
Sericocarpus oregonensisOregon white topped aster
Distribution: Occurring in the Columbia River Gorge in Washington; Washington south to California.
Habitat: Grasslands, forest openings, and savanna.
Origin: Native
Flowers: July-September
ssp. oregonensis – Oregon white topped aster
Sericocarpus rigidusColumbian white-topped aster, Columbian whitetop aster, rigid white topped aster
Distribution: West of the Cascades from southern Vancouver Island, BC, to southwest Oregon, but chiefly in Washington.
Habitat: Prairies and open areas at low elevations.
Origin: Native
Flowers: July - August
Silybum marianummilk thistle
Distribution: Introduced weed now well established in California; occasional at scattered locations in the Pacific Northwest.
Habitat: Waste places.
Origin: Introduced from the Mediterranean region
Flowers: May - July
Solidago elongataCascade Canada goldenrod, West Coast goldenrod
Origin: Native
Solidago lepidawestern Canada goldenrod
Distribution: Both sides of the Cascades in Washington; British Columbia to Idaho and Nevada, east to the Rocky Mountains and Manitoba.
Habitat: Dry to moist areas in meadows and riparian areas, from low to middle elevations.
Origin: Native
Flowers: July-October
var. lepida – western Canada goldenrod
var. salebrosa – Canada goldenrod, meadow goldenrod, Rocky Mountains Canada goldenrod
Solidago missouriensisMissouri goldenrod
Distribution: Southern British Columbia and western Washington, east to Ontario and Tennesee.
Habitat: Rather dry, open places, from the valleys and plains to fairly high elevations in the mountains.
Origin: Native
Flowers: Late June - October
Solidago multiradiatanorthern goldenrod, Rocky Mountain goldenrod
Distribution: Alaska to California, east to Colorado
Habitat: Mountain meadows and open slopes at high elevations
Origin: Native
Flowers: July - August
Solidago simplexsticky goldenrod
Distribution: Occurring in the Olympic and Cascade Mountains in Washington; Alaska to California, east to Minnesota and Texas.
Habitat: Open, slightly moist areas from coastal dunes to alpine meadows.
Origin: Native
Flowers: June-September
var. nana – dwarf goldenrod
var. simplex – sticky goldenrod
Soliva sessilislawn burrweed, common soliva, prickly soliva
Distribution: Known from western Washington, Oregon, and British Columbia
Habitat: Disturbed areas, roadsides, lawns
Origin: Introduced from South America
Flowers: May-June
Sonchus arvensisfield sow-thistle, perennial sow-thistle
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: Balds, prairies, forest edge, stream banks, roadsides, fields, and other disturbed open areas generally at low elevations, often where moist.
Origin: Introduced from Europe
Flowers: July-October
ssp. arvensis – corn sow-thistle, field sow-thistle, perennial sow-thistle
ssp. uliginosus – field sow-thistle, marsh sow-thistle, wet ground sow-thistle
Sonchus asperprickly sow-thistle, spiny leaf sow-thistle
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common west of the crest; Alaska to California, east to the Atlantic Coast.
Habitat: Forest edge, balds, prairies, roadsides, ditches, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced from Europe
Flowers: June-October
Sonchus oleraceuscommon sow-thistle
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common west of the crest; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Forest edge, balds, prairies, roadsides, ditches, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced from Europe
Flowers: June-October
Stenotus lanuginosuswoolly goldenweed
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Idaho, Montana, and Nevada.
Habitat: Open, dry, often rocky places, from sagebrush desert to ponderosa pine forest openings at middle elevations in the mountains.
Origin: Native
Flowers: May-July
var. lanuginosus – woolly goldenweed, woolly stenotus
Stephanomeria exiguasmall wirelettuce
Origin: Native
Stephanomeria paniculatastiff branched stephanomeria, stiff branched wirelettuce
Distribution: Occurring east of the Cascades in Washington; Oregon and adjacent Idaho, south to California.
Habitat: Dry, open places in the plains and foothills.
Origin: Native
Flowers: July-September
Stephanomeria tenuifoliawire lettuce, narrowleaf stephanomeria
Distribution: East of the Cascades in Washington; southern British Columbia south to California, east to Texas and western Montana.
Habitat: Dry, often rocky places, from the foothills and plains to moderate elevations in the mountains.
Origin: Native
Flowers: June-September
Symphyotrichum ×amethystinumamethyst aster, hybrid aster
Origin: Introduced
Symphyotrichum ascendensintermountain aster, long leaved aster, long-leaved aster, western American aster, western aster
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Meadows, grasslands, and forest openings, often where moist.
Origin: Native
Flowers: July-October
Symphyotrichum borealenorthern bog aster, rush aster, slender white aster
Distribution: Alaska south to Idaho, east to Minnesota; rare in the Pacific Northwest.
Habitat: Cold bogs.
Origin: Native
Flowers: July - September
Symphyotrichum bracteolatumbracted aster, Eaton's aster, Oregon aster
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Sasketchewan and Rocky Mountain states.
Habitat: Moist to wet sunny places, wet thickets, along streams and ditches
Origin: Native
Flowers: July-September
Symphyotrichum campestrewestern meadow aster, Western meadow aster
Origin: Native
Symphyotrichum chilensecommon California aster, Pacific aster
Distribution: Both sides of the Cascades, Washington to California, east to Montana and New Mexico.
Habitat: Dry, open places in the valleys and plains, to moderate elevations in the mountains.
Origin: Native
Flowers: July-October
Symphyotrichum ciliatumalkali American aster, rayless alkali aster, rayless annual aster
Distribution: Occurring east of the Cascades in northern Washington; British Columbia south to northern Washington, east to Minnesota.
Habitat: Moist, usually saline ground, often along the shores of lakes and ponds.
Origin: Native
Flowers: August-September
Symphyotrichum ×columbianumhybrid aster
Origin: Native
Symphyotrichum ericoidesheath-leaved aster, tufted white prairie aster
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia and eastern Washington and Montana, south to Utah, Colorado and Nebraska.
Habitat: Open, wet or dry places in the valleys and plains; tolerant of alkali.
Origin: Native
Flowers: July-September
var. pansum – little gray aster, tufted white prairie aster, white heath aster
Symphyotrichum falcatumrough white prairie aster, western heath aster
Origin: Native
Symphyotrichum foliaceumalpine leafybract aster, Canby's leafybract aster, Cusick's American aster, Cusick's aster, Henderson's aster, Kootenai aster, leafy aster, leafy-bracted aster, Parry's aster
Distribution: Alaska to California, east to Colorado
Habitat: Open, usually moist areas, low to high elevations in the mountains.
Origin: Native
Flowers: July-September
Symphyotrichum frondosumalkali aster, short rayed aster, short-rayed alkali aster
Distribution: Eastern Washington, south to California and east to Wyoming and Utah.
Habitat: Moist, usually saline soil, often along the shores of lakes and ponds, or in vernally moist, alkaline bottoms.
Origin: Native
Flowers: August - October
Symphyotrichum halliiHall's aster
Distribution: West of the Cascades in Washington and, more commonly, in Oregon.
Habitat: Dry, open places in the valleys and plains.
Origin: Native
Flowers: July - October
Symphyotrichum jessicaeJessica's aster, Palouse aster
Distribution: The Palouse country of southeast Washington and adjacent Idaho.
Habitat: Streambanks and open places.
Origin: Native
Flowers: July - September
Symphyotrichum laeveGeyer's aster, smooth aster
Distribution: Eastern British Columbia, eastern Washington and northeast Oregon, east to Maine and Georgia.
Habitat: Open places in the plains and valleys to moderate elevations in the mountains.
Origin: Native
Flowers: July - September
var. geyeri – smooth aster
Symphyotrichum lanceolatummarsh aster, western willow aster
Origin: Native
var. hesperium – lance-leaved aster, panicled aster, white panicled aster
Symphyotrichum novae-angliaeNew England aster
Distribution: Native to eastern United States; introduced as an ornamental and occasionally escaping in the Pacific Northwest.
Habitat: Roadsides and disturbed areas where somewhat moist.
Origin: Introduced
Flowers: July-September
Symphyotrichum pilosumhairy aster
Habitat: River cobbles, gravel, disturbed ground, and railroads.
Origin: Introduced
Flowers: August-September
var. pilosum – hairy aster
Symphyotrichum spathulatumwestern aster, western mountain aster, Western mountain aster
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Meadows and forest openings, moderate to mid-elevations in the mountains.
Origin: Native
Flowers: July-September
Symphyotrichum subspicatumDouglas' aster, Douglas's aster
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Alberta, Montana and Idaho.
Habitat: Moist woods, streambanks and seashores.
Origin: Native
Flowers: July-September
Tanacetum balsamitacostmary
Distribution: Introduced and escaped over much of the United States; not common in the Pacific Northwest.
Habitat: Roadsides and other waste places.
Origin: Introduced
Flowers: August - September
Tanacetum bipinnatumcamphor tansy, dune tansy
Distribution: British Columbia to northern California.
Habitat: Sand dunes along the coast.
Origin: Native
Flowers: June - September
Tanacetum partheniumfeatherfew, feverfew
Distribution: Scattered locations throughout Washington; introduced in most of the western and eastern United States; escaped from gardens.
Habitat: Waste places.
Origin: Introduced from Europe
Flowers: June-September
Tanacetum vulgarecommon tansy
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Roadsides and waste ground, often cultivated and escaped
Origin: Introduced from Europe
Flowers: July-October
Taraxacum alaskanumdwarf alpine dandelion
Distribution: Occuring only in North Cascades in Washington; Alaska to Washington, also in Russian Far East.
Habitat: Rocky, exposed areas in alpine habitatas.
Flowers: July-September
Taraxacum ceratophorumhorned dandelion
Distribution: Occurring in mountainous areas on both sides of the Cascades crest in Washington; Northwester Territory to Washington, east to Rocky Mountains; also in extreme northeastern Canada and Greenland.
Habitat: Rocky, open areas in the alpine.
Origin: Native
Flowers: July-September
Taraxacum erythrospermumred-seeded dandelion
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Meadows, grasslands, prairies, and other open areas, typically where some level of disturbance present.
Origin: Introduced
Flowers: April-October
Taraxacum officinalecommon dandelion
Distribution: Occurring throughout Washington; introduced throughout North America.
Habitat: Common in disturbed areas, fields, lawns, from the coast to the alpine.
Origin: Introduced from Europe
Flowers: March-October
Taraxacum scopulorumalpine dandelion
Tetradymia canescensgray horsebrush, spineless horsebrush
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to Montana and New Mexico.
Habitat: Dry, open places in the foothills and plains.
Origin: Native
Flowers: June-September
Tonestus lyalliiLyall's goldenweed, Lyall's serpentweed
Distribution: Occurring in the Olympics and Cascades mountains in Washington; British Columbia south to California, east to Alberta, south to Colorado.
Habitat: Mountain meadows and rocky slopes, alpine and subalpine.
Origin: Native
Flowers: July-September
Townsendia florifershowy Townsend-daisy, showy townsendia
Distribution: Occurring east of the Cascades crest in Washington; Washington south to Oregon and Nevada, east to the Rocky Mountains.
Habitat: Dry-open places in the plains and foothills, often with sagebrush.
Origin: Native
Flowers: May-July
Tragopogon dubiusyellow salsify
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, wastelots, overgrazed areas, and other disturbed open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: May-September
Tragopogon floccosuswoolly goatsbeard
Distribution: Known only from Whitman County in Washington.
Habitat: Disturbed areas, fields, roadsides.
Origin: Introduced
Flowers: July-August
Tragopogon mirusremarkable goatsbeard
Distribution: Known only from one colony at Pullman, Washington, and another at nearby Palouse.
Habitat: Dry, open areas in the foothills.
Origin: Native
Tragopogon miscellushybrid goatsbeard
Origin: Native
Tragopogon porrifoliusoyster plant, purple salsify
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Roadsides, fields and waste places, usually where moist.
Origin: Introduced from Europe
Flowers: April-August
Tragopogon pratensisjack go to bed at noon, meadow salsify
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Roadsides, fields and waste places, usually in slightly moist areas.
Origin: Introduced
Flowers: May-August
Tripleurospermum inodorumfalse chamomile, false mayweed, scentless mayweed
Distribution: Occurring in scattered locations throughout Washington; widely distributed throughout northern 2/3 of North America.
Habitat: Noxious weed in fields and waste ground in eastern Washington
Origin: Introduced from Europe
Flowers: June-September
Tussilago farfaracoltsfoot
Distribution: In scattered locations in western Washington; widespread in eastern North America.
Habitat: Waste ground, disturbed forest understory, and near areas of garden cultivation.
Origin: Introduced from Eurasia
Flowers: March-May
Uropappus lindleyilinearleaf microseris, silver puffs, Lindley's false silverpuffs
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Idaho, south to Texas.
Habitat: Open hillsides, forest openings, from low to mid-elevations.
Origin: Native
Flowers: March-May
Wyethia amplexicaulisnorthern mule's ears, smooth dwarf sunflower
Distribution: Occurring east of the Cascades crest in Washington; Washington to Nevada, east to the Rocky Mountains.
Habitat: Seasonally moist areas in sagebrush-steppe, to open areas at moderate elevations.
Origin: Native
Flowers: May-July
Wyethia angustifolianarrowleaf mule's ears, narrowleaf wyethia
Distribution: Occurring west of the Cascades crest in southwestern Washington, and east in the Columbia River Gorge; Washington to California.
Habitat: Meadows and moist, open hillsides at low elevations.
Origin: Native
Flowers: May-July
Xanthium spinosumspiny clotbur, spiny cockleburr
Origin: Introduced from South America (although treated as native in CA by Jeps. Man.)
Flowers: July - October
Xanthium strumariumCanada cocklebur, common cocklebur
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Fields, waste places, flood lanes and lake beaches.
Origin: Native
Flowers: April-October