Vascular Plants
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Common names beginning with A:
Absinthe (Artemisia absinthium)
Distribution: Introduced in the northern half of the United States and southern Canada
Habitat: Weed of roadsides and waste places
Origin: Introduced
Northern adder's-tongue (Ophioglossum pusillum)
Distribution: Alaska to California, and Montana east to Maine and Virginia
Habitat: Meadows and woods at moderate elevations in the mountains
Origin: Native
Alpine lake agoseris (Nothocalais alpestris)
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
Annual agoseris (Agoseris heterophylla)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to Montana and Arizona.
Habitat: Dry, open areas at low to mid-elevations.
Origin: Native
False agoseris (Nothocalais troximoides)
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
Mountain agoseris (Agoseris monticola)
Distribution: East of the Cascades in Washington; Washington south to California, east to Nevada.
Habitat: Mesic meadows in the subalpine and alpine.
Origin: Native
Sierra Nevada agoseris (Agoseris monticola)
Distribution: East of the Cascades in Washington; Washington south to California, east to Nevada.
Habitat: Mesic meadows in the subalpine and alpine.
Origin: Native
Spear leaved agoseris (Agoseris retrorsa)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Nevada, Utah, and Arizona.
Habitat: Shrub-steppe and ponderosa pine forest openings.
Origin: Native
Tall agoseris (Agoseris elata)
Distribution: On both sides of the Cascades in Washington; Washington south to California.
Habitat: Meadows and open woods, from the valleys to moderate elevations in the mountains.
Origin: Native
California alder (Alnus rhombifolia)
Distribution: Chiefly east of the Cascades crest in Washington; Washington south to California and Nevada, east to Idaho.
Habitat: Near streams at low elevations.
Origin: Native
Oregon alder (Alnus rubra)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska south to California, disjunct to the east in northern Idaho.
Habitat: Moist areas at low elevations.
Origin: Native
Red alder (Alnus rubra)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska south to California, disjunct to the east in northern Idaho.
Habitat: Moist areas at low elevations.
Origin: Native
White alder (Alnus rhombifolia)
Distribution: Chiefly east of the Cascades crest in Washington; Washington south to California and Nevada, east to Idaho.
Habitat: Near streams at low elevations.
Origin: Native
Alfalfa (Medicago sativa)
Distribution: Introduced as a forage crop in the temperate regions of the world
Habitat: Near cultivated fields, roadsides, often on dry ground
Origin: Introduced
Small alison (Alyssum alyssoides)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America except for parts of southeastern U.S.
Habitat: Dry, waste areas, becoming common in the shrub-steppe of eastern Washington.
Origin: Introduced from Eurasia
Sweet alison (Lobularia maritima)
Distribution: Occurring in scattered locations across Washington; British Columbia south to Texas; also occurring throughout central and eastern North America.
Habitat: Escaping from cultivation to roadsides, pastures, and other disturbed areas, often where moist.
Origin: Introduced from the western Mediterranean
Alkali-mallow (Malvella leprosa)
Distribution: Washington to California, east to Idaho and southern Great Plains.
Habitat: Sagebrush desert in sandy (often alkaline) soil.
Origin: Not of conservation concern
Alkali-sacaton (Sporobolus airoides)
Origin: Native
Weeping alkaligrass (Puccinellia distans)
Distribution: Occurring east of the Cascades in Washington; North-central British Columbia south, chiefly east of the Cascades, to California, east through most of Canada and to the east base of the Rockies.
Habitat: Moist soil, especially where alkaline.
Origin: Introduced
Common alkanet (Anchusa officinalis)
Distribution: Occurring in scattered locations throughout Washington, but mostly east of the Cascades; occurring throught much of western North America, the upper Midwest, and northeastern U.S.
Habitat: Disturbed areas.
Origin: Introduced from Mediterranean region
Green alkanet (Pentaglottis sempervirens)
Distribution: Occurring in lowland western Washington; British Columbia south to California.
Habitat: Disturbed soil in shaded areas.
Origin: Introduced from sw Europe
Italian alkanet (Anchusa azurea)
Distribution: Scattered localities in Washington; British Columbia south to California, scattered localities east of the Cascades to the Atlantic Coast.
Habitat: Disturbed soil.
Origin: Introduced from Old World
Allheal (Valeriana officinalis)
Origin: Introduced from Europe
Almond (Prunus dulcis)
Distribution: Escaped from cultivation sporadically in western North America. Native to Asia.
Habitat: Disturbed areas, riparian zones.
Origin: Introduced
Alpine-azalea (Kalmia procumbens)
Origin: Native
Dwarf alpinegold (Hulsea nana)
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
Poker alum-root (Heuchera cylindrica)
Distribution: East of the Cascade summits, British Columbia to California, east to Alberta and Wyoming
Habitat: Rocky soil, cliffs and talus slopes, foothills to mid-elevations in the mountains
Origin: Native
Alpine alumroot (Heuchera glabra)
Distribution: In the Cascades, Olympics, and Selkirks and m ountains in Washington; Alaska south to Mt. Hood, Oregon.
Habitat: Streambanks and moist rocks, from the coast to above timberline
Origin: Native
Gooseberry-leaved alumroot (Heuchera grossulariifolia)
Distribution: Southwest Montana and central Idaho to the Wallowa Mountains of northeast Oreagon, and the Columbia River Gorge of Washington and Oregon.
Habitat: Grassy canyons and rocky canyon walls to alpine scree and talus slopes.
Origin: Native
Gooseberry-leaved alumroot (Heuchera grossulariifolia)
Distribution: Southwest Montana and central Idaho to the Wallowa Mountains of northeast Oreagon, and the Columbia River Gorge of Washington and Oregon.
Habitat: Grassy canyons and rocky canyon walls to alpine scree and talus slopes.
Origin: Native
Green-flowered alumroot (Heuchera chlorantha)
Distribution: West of the Cascade summit, Queen Charlotte Island, British Columbia south to Douglas County, Oregon, up the Columbia River Gorge to the east base of the Cascades, then south along the Oregon Cascades to Klamath County, OR.
Habitat: Gravelly prairies and wooded hillsides.
Origin: Native
Lava alumroot (Heuchera cylindrica)
Distribution: East of the Cascade summits, British Columbia to California, east to Alberta and Wyoming
Habitat: Rocky soil, cliffs and talus slopes, foothills to mid-elevations in the mountains
Origin: Native
Lava alumroot (Heuchera cylindrica)
Distribution: East of the Cascade summits, British Columbia to California, east to Alberta and Wyoming
Habitat: Rocky soil, cliffs and talus slopes, foothills to mid-elevations in the mountains
Origin: Native
Lava alumroot (Heuchera cylindrica)
Distribution: East of the Cascade summits, British Columbia to California, east to Alberta and Wyoming
Habitat: Rocky soil, cliffs and talus slopes, foothills to mid-elevations in the mountains
Origin: Native
Lava alumroot (Heuchera cylindrica)
Distribution: East of the Cascade summits, British Columbia to California, east to Alberta and Wyoming
Habitat: Rocky soil, cliffs and talus slopes, foothills to mid-elevations in the mountains
Origin: Native
Lava alumroot (Heuchera cylindrica)
Distribution: East of the Cascade summits, British Columbia to California, east to Alberta and Wyoming
Habitat: Rocky soil, cliffs and talus slopes, foothills to mid-elevations in the mountains
Origin: Native
Meadow alumroot (Heuchera chlorantha)
Distribution: West of the Cascade summit, Queen Charlotte Island, British Columbia south to Douglas County, Oregon, up the Columbia River Gorge to the east base of the Cascades, then south along the Oregon Cascades to Klamath County, OR.
Habitat: Gravelly prairies and wooded hillsides.
Origin: Native
Roundleaf alumroot (Heuchera cylindrica)
Distribution: East of the Cascade summits, British Columbia to California, east to Alberta and Wyoming
Habitat: Rocky soil, cliffs and talus slopes, foothills to mid-elevations in the mountains
Origin: Native
Roundleaf alumroot (Heuchera cylindrica)
Distribution: East of the Cascade summits, British Columbia to California, east to Alberta and Wyoming
Habitat: Rocky soil, cliffs and talus slopes, foothills to mid-elevations in the mountains
Origin: Native
Roundleaf alumroot (Heuchera cylindrica)
Distribution: East of the Cascade summits, British Columbia to California, east to Alberta and Wyoming
Habitat: Rocky soil, cliffs and talus slopes, foothills to mid-elevations in the mountains
Origin: Native
Roundleaf alumroot (Heuchera cylindrica)
Distribution: East of the Cascade summits, British Columbia to California, east to Alberta and Wyoming
Habitat: Rocky soil, cliffs and talus slopes, foothills to mid-elevations in the mountains
Origin: Native
Roundleaf alumroot (Heuchera cylindrica)
Distribution: East of the Cascade summits, British Columbia to California, east to Alberta and Wyoming
Habitat: Rocky soil, cliffs and talus slopes, foothills to mid-elevations in the mountains
Origin: Native
Smooth alumroot (Heuchera glabra)
Distribution: In the Cascades, Olympics, and Selkirks and m ountains in Washington; Alaska south to Mt. Hood, Oregon.
Habitat: Streambanks and moist rocks, from the coast to above timberline
Origin: Native
Tall alumroot (Heuchera chlorantha)
Distribution: West of the Cascade summit, Queen Charlotte Island, British Columbia south to Douglas County, Oregon, up the Columbia River Gorge to the east base of the Cascades, then south along the Oregon Cascades to Klamath County, OR.
Habitat: Gravelly prairies and wooded hillsides.
Origin: Native
Desert alyssum (Alyssum desertorum)
Distribution: East of the Cascades in Washington; widely distributed throughout central and western North America.
Habitat: Dry, open ground, often where disturbed.
Origin: Introduced from Eurasia
Hoary alyssum (Berteroa incana)
Distribution: In scattered locations east of the Cascades in Washington; widely distributed throughout much of North America.
Habitat: Uncommon in dry, waste places in most of the Pacific Northwest; common in northeast Washington.
Origin: Introduced from Europe
Sweet alyssum (Lobularia maritima)
Distribution: Occurring in scattered locations across Washington; British Columbia south to Texas; also occurring throughout central and eastern North America.
Habitat: Escaping from cultivation to roadsides, pastures, and other disturbed areas, often where moist.
Origin: Introduced from the western Mediterranean
Blood amaranth (Amaranthus cruentus)
Origin: Probably introduced from cultivation in Central America
California amaranth (Amaranthus californicus)
Distribution: Alberta to California, east to the Great Plains.
Habitat: Seasonally moist flats and shorelines, wastelots, and other disturbed areas;
Origin: Native
Caterpillar amaranth (Amaranthus cruentus)
Origin: Probably introduced from cultivation in Central America
Green amaranth (Amaranthus hybridus)
Distribution: Found in much of the United States, but uncommon in the Pacific Northwest; collected in Whitman County
Habitat: Dry areas, disturbed sites, agricultural fields.
Origin: Introduced from riparian zones in eastern North America
Green amaranth (Amaranthus powellii)
Distribution: Introduced in much of the United States; common in the Pacific Northwest
Habitat: Disturbed areas
Origin: Introduced from the southwestern United States and Mexico
Hybrid amaranth (Amaranthus hybridus)
Distribution: Found in much of the United States, but uncommon in the Pacific Northwest; collected in Whitman County
Habitat: Dry areas, disturbed sites, agricultural fields.
Origin: Introduced from riparian zones in eastern North America
Livid amaranth (Amaranthus blitum)
Origin: Introduced from the tropics
Pale amaranth (Amaranthus blitum)
Origin: Introduced from the tropics
Powell's amaranth (Amaranthus powellii)
Distribution: Introduced in much of the United States; common in the Pacific Northwest
Habitat: Disturbed areas
Origin: Introduced from the southwestern United States and Mexico
Purple amaranth (Amaranthus cruentus)
Origin: Probably introduced from cultivation in Central America
Smooth amaranth (Amaranthus hybridus)
Distribution: Found in much of the United States, but uncommon in the Pacific Northwest; collected in Whitman County
Habitat: Dry areas, disturbed sites, agricultural fields.
Origin: Introduced from riparian zones in eastern North America
American-brooklime (Veronica americana)
Distribution: Widely distributed throughout Washington; widely distributed throughout most of North America except southeast corner of U.S.
Habitat: Wet places, lowlands to moderate elevations in the mountains.
Origin: Native
Western ammania (Ammannia robusta)
Distribution: Occurring east of the Cascades crest in Washington; widely distributed from the tropics to much of North America.
Habitat: Wet places, often where alkaline.
Origin: Native
Little mountain anemone (Anemone lyallii)
Distribution: Chiefly west of the Cascades but occasionally on the east slope in Washington; British Columbia to California.
Habitat: Open prairies at low elevations to subalpine ridges.
Origin: Native
Lyall's anemone (Anemone lyallii)
Distribution: Chiefly west of the Cascades but occasionally on the east slope in Washington; British Columbia to California.
Habitat: Open prairies at low elevations to subalpine ridges.
Origin: Native
Northern anemone (Anemone parviflora)
Distribution: Occurring in scattered locaions in Washington; Alaska south to the Cascades of northern Washington, east to the Atlantic Coast, south in the Rocky Mountains to Colorado.
Habitat: Mountain meadows and subalpine stream banks.
Origin: Native
Piper's anemone (Anemone piperi)
Distribution: East of the Cascades in Washington;Washington to northeast Oregon east to Idaho and western Montana.
Habitat: Shady woods at moderate to mid-elevations in the mountains.
Origin: Native
Small-flowered anemone (Anemone parviflora)
Distribution: Occurring in scattered locaions in Washington; Alaska south to the Cascades of northern Washington, east to the Atlantic Coast, south in the Rocky Mountains to Colorado.
Habitat: Mountain meadows and subalpine stream banks.
Origin: Native
Threeleaf anemone (Anemone deltoidea)
Distribution: On both sides of the Cascades in the southern half of Washington; Washington south to California.
Habitat: Moist to drier areas in open to deep woods at low to moderate elevations.
Origin: Native
Angel's-trumpet (Datura innoxia)
Origin: Introduced
Canby's angelica (Angelica canbyi)
Origin: Native
Henderson's angelica (Angelica hendersonii)
Distribution: Coastal Washington; south to California.
Habitat: Coastal bluffs and sand dunes.
Origin: Native
Kneeling angelica (Angelica genuflexa)
Distribution: Chiefly west of the Cascades in Washington; Alaska south to California, east in British Columbia to the Selkirk Mountains.
Habitat: Stream banks, wet meadows and other moist places, moderate to mid-elevations in the mountains.
Origin: Native
Lyall's angelica (Angelica arguta)
Distribution: Both sides of the Cascades in Washington; British Columbia south to California, east to Alberta and Utah.
Habitat: Stream banks, wet meadows, marshes and bottomlands, from the foothills and valleys to moderate elevations in the mountains.
Origin: Native
Seacoast angelica (Angelica lucida)
Distribution: West of the Cascades in Washington; margin of the Pacific Basin, from the Kuril Islands to California.
Habitat: Coastal bluffs and beaches in the Pacific Northwest, occasionally inland elsewhere.
Origin: Native
Sharptooth angelica (Angelica arguta)
Distribution: Both sides of the Cascades in Washington; British Columbia south to California, east to Alberta and Utah.
Habitat: Stream banks, wet meadows, marshes and bottomlands, from the foothills and valleys to moderate elevations in the mountains.
Origin: Native
Rocky Mountain ankle-aster (Ionactis stenomeres)
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
Queen Anne's-lace (Daucus carota)
Distribution: Widely distributed throughout Washington; Widely distributed throughout North America.
Habitat: Roadsides, ditchbanks, somewhat moist waste land.
Origin: Introduced. Native to Europe.
Sweet Annie (Artemisia annua)
Distribution: Native of Eurasia, naturalized in eastern United States, rare in the Pacific Northwest.
Habitat: Fields and waste places.
Origin: Introduced
Antelope-brush (Purshia tridentata)
Distribution: Widely distributed east of the Cascades crest in Washington; British Columbia south to California, east to Montana, Colorado and New Mexico.
Habitat: Sagebrush desert and shrub-steppe to ponderosa pine forests.
Origin: Native
St. Anthony's-turnip (Ranunculus bulbosus)
Origin: Introdued from Europe
Apargidium (Microseris borealis)
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
Apple (Malus ×domestica)
Distribution: In scattered locations in Washington;
Habitat: Disturbed areas, often where escaped from cultivation.
Origin: Introduced from Eurasia
Cultivated apple (Malus ×domestica)
Distribution: In scattered locations in Washington;
Habitat: Disturbed areas, often where escaped from cultivation.
Origin: Introduced from Eurasia
Cultivated apple (Malus pumila)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Forested edges and openings, fields, roadsides, abandoned homesteads, and other disturbed areas.
Origin: Introduced
Cultivated apple (Malus pumila)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Forested edges and openings, fields, roadsides, abandoned homesteads, and other disturbed areas.
Origin: Introduced
Dawson apple (Malus dawsoniana)
Distribution: Occurring west of the Cascades crest in Washington; Washington south to Oregon.
Habitat: Fields, roadsides, wastelots, and abandoned homesteads.
Origin: Native
Sacred thorn apple (Datura wrightii)
Distribution: Scattered locations across Washington; California east across the U.S. to New England.
Habitat: Disturbed, dry, open areas, roadsides, and waste places.
Origin: Introduced from Mexico
Yellow archangel (Lamiastrum galeobdolon)
Distribution: West of the Cascades in Washington; California and scattered localities in eastern U.S.
Habitat: Introduced as an ornamental, escaping in lowland forest understory and disturbed soil in shaded areas.
Origin: Introduced from Eurasia
Broad leaved arnica (Arnica latifolia)
Distribution: Both sides of the Cascades in Washington; Alaska south through Washington.
Habitat: Common in open forests and open, rocky areas at mid- to high elevations in the mountains.
Origin: Native
Bunch arnica (Arnica sororia)
Distribution: Chiefly east of the Cascades, British Columbia to California, east to Wyoming.
Habitat: Open, often rather dry places, but usually vernally moist, in the foothills and at moderate elevations in the mountains.
Origin: Native
Cordilleran arnica (Arnica mollis)
Distribution: In the mountains from British Columbia to California, east to Alberta and Colorado
Habitat: Frequent in moist meadows at mid- to high elevations in the mountains
Origin: Native
Hairy arnica (Arnica mollis)
Distribution: In the mountains from British Columbia to California, east to Alberta and Colorado
Habitat: Frequent in moist meadows at mid- to high elevations in the mountains
Origin: Native
Heart leaf arnica (Arnica cordifolia)
Distribution: Pacific Northwest, including southern British Columbia, and east into the Rocky Mountains
Habitat: Moderately dry, open forests from fairly low (where common) to sub-alpine
Origin: Native
Hillside arnica (Arnica fulgens)
Distribution: British Columbia to California, uncommon east to North Dakota; east of the Cascades in Washington and Oregon
Habitat: Open places from the foothills to moderate elevations in the mountains
Origin: Native
Leafy arnica (Arnica chamissonis)
Distribution: Occurring in the Cascades and northeastern corner of Washington; Alaska south to California, east across Canada and to the Rockies in the U.S.
Habitat: Meadows and wet places at moderate elevations.
Origin: Native
Longleaf arnica (Arnica longifolia)
Distribution: Southern Alberta south to Washington, Colorado and California.
Habitat: Rocky soil in seeps or springs, cliffs, or riverbanks, at moderate to high elevations in the mountains.
Origin: Native
Meadow arnica (Arnica chamissonis)
Distribution: Occurring in the Cascades and northeastern corner of Washington; Alaska south to California, east across Canada and to the Rockies in the U.S.
Habitat: Meadows and wet places at moderate elevations.
Origin: Native
Mountain arnica (Arnica latifolia)
Distribution: Both sides of the Cascades in Washington; Alaska south through Washington.
Habitat: Common in open forests and open, rocky areas at mid- to high elevations in the mountains.
Origin: Native
Narrowleaf arnica (Arnica chamissonis)
Distribution: Occurring in the Cascades and northeastern corner of Washington; Alaska south to California, east across Canada and to the Rockies in the U.S.
Habitat: Meadows and wet places at moderate elevations.
Origin: Native
Nevada arnica (Arnica nevadensis)
Distribution: Cascade and Olympic Mountains of Washington, south to California; rare in our range.
Habitat: Open, rocky slopes at high elevations in the mountains.
Origin: Native
Orange arnica (Arnica fulgens)
Distribution: British Columbia to California, uncommon east to North Dakota; east of the Cascades in Washington and Oregon
Habitat: Open places from the foothills to moderate elevations in the mountains
Origin: Native
Parry's arnica (Arnica parryi)
Distribution: In the mountains from British Columbia to California, east to Alberta and Colorado
Habitat: Open woods and meadows, moderate to mid-elevations in the mountains
Origin: Native
Rayless arnica (Arnica discoidea)
Distribution: Cascades of Klickitat and Skamania counties in Washington; Washington south to California.
Habitat: Open forest at moderate elevations.
Origin: Native
Rydberg's arnica (Arnica rydbergii)
Distribution: British Columbia south to northern California, east to Alberta and Colorado.
Habitat: Dry meadows and open slopes at high elevations in the mountains.
Origin: Native
Seep spring arnica (Arnica longifolia)
Distribution: Southern Alberta south to Washington, Colorado and California.
Habitat: Rocky soil in seeps or springs, cliffs, or riverbanks, at moderate to high elevations in the mountains.
Origin: Native
Sierra arnica (Arnica nevadensis)
Distribution: Cascade and Olympic Mountains of Washington, south to California; rare in our range.
Habitat: Open, rocky slopes at high elevations in the mountains.
Origin: Native
Silvery arnica (Arnica chamissonis)
Distribution: Occurring in the Cascades and northeastern corner of Washington; Alaska south to California, east across Canada and to the Rockies in the U.S.
Habitat: Meadows and wet places at moderate elevations.
Origin: Native
Slender arnica (Arnica gracilis)
Distribution: Occurring in mountainous areas throughout Washington; British Columbia south to California, east to Colorado and Utah.
Habitat: Rocky places, usually at rather high elevations in the mountains.
Origin: Native
Sticky arnica (Arnica ovata)
Distribution: Both sides of the Cascades in Washington; Alaska south to California, east to Montana and Utah.
Habitat: Rocky places at moderate to high elevations in the mountains.
Origin: Native
Sticky leaf arnica (Arnica ovata)
Distribution: Both sides of the Cascades in Washington; Alaska south to California, east to Montana and Utah.
Habitat: Rocky places at moderate to high elevations in the mountains.
Origin: Native
Subalpine arnica (Arnica rydbergii)
Distribution: British Columbia south to northern California, east to Alberta and Colorado.
Habitat: Dry meadows and open slopes at high elevations in the mountains.
Origin: Native
Twin arnica (Arnica sororia)
Distribution: Chiefly east of the Cascades, British Columbia to California, east to Wyoming.
Habitat: Open, often rather dry places, but usually vernally moist, in the foothills and at moderate elevations in the mountains.
Origin: Native
Marsh arrow-grass (Triglochin palustris)
Origin: Native
Seaside arrow-grass (Triglochin maritima)
Distribution: Widely distributed throughout much of Washington; Alaska south to California, east to the Rocky Mountains, then mostly across northern U.S. and southern Canada to the Atlantic Coast.
Habitat: Marsh to moist, gravelly areas, mostly were saline or alkaline.
Origin: Native
Arumleaf arrowhead (Sagittaria cuneata)
Distribution: East of the Cascades in Washington; British Columbia south to California, east to New York.
Habitat: Ponds, lake shores and ditches.
Origin: Native
Awl-leaf arrowhead (Sagittaria subulata)
Origin: Introduced from tidewaters in eastern North America
Common arrowhead (Sagittaria latifolia)
Distribution: Occurring on both sides of the Cascades in Washington; Vancouver Island, British Columbia south to central California; primary distribution in central and eastern North America.
Habitat: Ditches, ponds, lakes, swampy areas.
Origin: Native
Northern arrowhead (Sagittaria cuneata)
Distribution: East of the Cascades in Washington; British Columbia south to California, east to New York.
Habitat: Ponds, lake shores and ditches.
Origin: Native
Sessile-fruited arrowhead (Sagittaria rigida)
Distribution: Occurring in lowland areas west of the Cascades crest in Washington; California; central U.S. and southern Canada east to northeastern U.S. and Canada; scattered locations elsewhere in U.S. and Canada.
Habitat: Pond and lake margins.
Origin: Introduced from eastern North America
Jerusalem artichoke (Helianthus tuberosus)
Distribution: Introdued and widespread in eastern United States; uncommon in the Pacific Northwest.
Habitat: Moist soil and waste places.
Origin: Introduced
Arrow arum (Peltandra virginica)
Origin: Introduced
Green ash (Fraxinus pennsylvanica)
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America except some West Coast states and provinces.
Habitat: Riparian zones where soil is moist but not saturated.
Origin: Introduced
Oregon ash (Fraxinus latifolia)
Distribution: West of the Cascades in Washington; British Columbia south to California.
Habitat: Deep, fertile, generally moist soil along the coast and prairie areas.
Origin: Native
Asparagus (Asparagus officinalis)
Distribution: Introduced throughout the United States
Habitat: Garden escape, often of roadsides.
Origin: Introduced from Eurasia
Quaking aspen (Populus tremuloides)
Distribution: Broadly distributed in Washington, but chiefly east of the Cascades in Washington; Alaska to California, east to Labrador and New Jersey.
Habitat: Moist areas, low to fairly high elevations in the mountains
Origin: Native
Alkali American aster (Symphyotrichum ciliatum)
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
Alkali aster (Symphyotrichum frondosum)
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
Amethyst aster (Symphyotrichum ×amethystinum)
Origin: Native
Arctic aster (Eurybia merita)
Origin: Native
Arctic aster (Eurybia sibirica)
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
Behring wood aster (Eurybia merita)
Origin: Native
Behring wood aster (Eurybia sibirica)
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
Bracted aster (Symphyotrichum bracteolatum)
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
Columbian white-topped aster (Sericocarpus rigidus)
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
Columbian whitetop aster (Sericocarpus rigidus)
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
Cusick's American aster (Symphyotrichum cusickii)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to Oregon, east to Alberta, Idaho, and Montana.
Habitat: Moist, often wooded places at moderate to high elevations in the mountains.
Origin: Native
Cusick's American aster (Symphyotrichum cusickii)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to Oregon, east to Alberta, Idaho, and Montana.
Habitat: Moist, often wooded places at moderate to high elevations in the mountains.
Origin: Native
Cusick's aster (Symphyotrichum cusickii)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to Oregon, east to Alberta, Idaho, and Montana.
Habitat: Moist, often wooded places at moderate to high elevations in the mountains.
Origin: Native
Cusick's aster (Symphyotrichum cusickii)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to Oregon, east to Alberta, Idaho, and Montana.
Habitat: Moist, often wooded places at moderate to high elevations in the mountains.
Origin: Native
Douglas' aster (Symphyotrichum subspicatum)
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
Douglas' aster (Symphyotrichum subspicatum)
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
Douglas's aster (Symphyotrichum subspicatum)
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
Douglas's aster (Symphyotrichum subspicatum)
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
Eaton's aster (Symphyotrichum bracteolatum)
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
Eaton's aster (Symphyotrichum bracteolatum)
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
Eaton's aster (Symphyotrichum bracteolatum)
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
Engelmann's aster (Eucephalus engelmannii)
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
Engelmann's aster (Eucephalus engelmannii)
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
Few flowered aster (Canadanthus modestus)
Distribution: Widely distributed throughout mountainous areas of Washington; British Columbia south to Oregon, east to Michigan.
Habitat: Streambanks and moist woods at moderate to mid-elevations in the mountains.
Origin: Native
Few flowered aster (Canadanthus modestus)
Distribution: Widely distributed throughout mountainous areas of Washington; British Columbia south to Oregon, east to Michigan.
Habitat: Streambanks and moist woods at moderate to mid-elevations in the mountains.
Origin: Native
Great northern aster (Canadanthus modestus)
Distribution: Widely distributed throughout mountainous areas of Washington; British Columbia south to Oregon, east to Michigan.
Habitat: Streambanks and moist woods at moderate to mid-elevations in the mountains.
Origin: Native
Great northern aster (Canadanthus modestus)
Distribution: Widely distributed throughout mountainous areas of Washington; British Columbia south to Oregon, east to Michigan.
Habitat: Streambanks and moist woods at moderate to mid-elevations in the mountains.
Origin: Native
Hall's aster (Symphyotrichum hallii)
Distribution: West of the Cascades in Washington and, more commonly, in Oregon.
Habitat: Dry, open places in the valleys and plains.
Origin: Native
Hall's aster (Symphyotrichum hallii)
Distribution: West of the Cascades in Washington and, more commonly, in Oregon.
Habitat: Dry, open places in the valleys and plains.
Origin: Native
Henderson's aster (Symphyotrichum hendersonii)
Distribution: Occurring in northeastern region of Washington; Washington south to Oregon, east to Idaho and Montana.
Habitat: Moist, often wooded places at moderate to high elevations in the mountains.
Origin: Native
Henderson's aster (Symphyotrichum hendersonii)
Distribution: Occurring in northeastern region of Washington; Washington south to Oregon, east to Idaho and Montana.
Habitat: Moist, often wooded places at moderate to high elevations in the mountains.
Origin: Native
Hybrid aster (Symphyotrichum ×amethystinum)
Origin: Native
Hybrid aster (Symphyotrichum ×columbianum)
Origin: Native
Intermountain aster (Symphyotrichum ascendens)
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
Jessica's aster (Symphyotrichum jessicae)
Distribution: southeastern Washington and adjacent Idaho.
Habitat: Streambanks and open places.
Origin: Native
Jessica's aster (Symphyotrichum jessicae)
Distribution: southeastern Washington and adjacent Idaho.
Habitat: Streambanks and open places.
Origin: Native
Klickitat aster (Eucephalus glaucescens)
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, WA endemic
Klickitat aster (Eucephalus glaucescens)
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, WA endemic
Kootenai aster (Symphyotrichum hendersonii)
Distribution: Occurring in northeastern region of Washington; Washington south to Oregon, east to Idaho and Montana.
Habitat: Moist, often wooded places at moderate to high elevations in the mountains.
Origin: Native
Long leaved aster (Symphyotrichum ascendens)
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
Long-leaved aster (Symphyotrichum ascendens)
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
New England aster (Symphyotrichum novae-angliae)
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
New England aster (Symphyotrichum novae-angliae)
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
Northern bog aster (Symphyotrichum boreale)
Distribution: Alaska south to Idaho, east to Minnesota; rare in the Pacific Northwest.
Habitat: Cold bogs.
Origin: Native
Olympic Mountain aster (Eucephalus paucicapitatus)
Distribution: Olympic Mountains of Washington and Vancouver Island, British Columbia.
Habitat: Open slopes, mid- to high elevations.
Origin: Native
Olympic Mountain aster (Eucephalus paucicapitatus)
Distribution: Olympic Mountains of Washington and Vancouver Island, British Columbia.
Habitat: Open slopes, mid- to high elevations.
Origin: Native
Oregon aster (Symphyotrichum bracteolatum)
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
Oregon aster (Symphyotrichum bracteolatum)
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
Oregon aster (Symphyotrichum bracteolatum)
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
Palouse aster (Symphyotrichum jessicae)
Distribution: southeastern Washington and adjacent Idaho.
Habitat: Streambanks and open places.
Origin: Native
Rayless alkali aster (Symphyotrichum ciliatum)
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
Rayless alkali aster (Symphyotrichum ciliatum)
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
Rayless annual aster (Symphyotrichum ciliatum)
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
Rigid white topped aster (Sericocarpus rigidus)
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
Rocky Mountain aster (Ionactis stenomeres)
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
Rough leaved aster (Eurybia radulina)
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
Rough leaved aster (Eurybia radulina)
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
Rush aster (Symphyotrichum boreale)
Distribution: Alaska south to Idaho, east to Minnesota; rare in the Pacific Northwest.
Habitat: Cold bogs.
Origin: Native
Rush aster (Symphyotrichum boreale)
Distribution: Alaska south to Idaho, east to Minnesota; rare in the Pacific Northwest.
Habitat: Cold bogs.
Origin: Native
Short rayed aster (Symphyotrichum frondosum)
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
Short-rayed alkali aster (Symphyotrichum frondosum)
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
Showy aster (Eurybia conspicua)
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
Siberian aster (Eurybia merita)
Origin: Native
Siberian aster (Eurybia sibirica)
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
Slender white aster (Symphyotrichum boreale)
Distribution: Alaska south to Idaho, east to Minnesota; rare in the Pacific Northwest.
Habitat: Cold bogs.
Origin: Native
Subalpine aster (Eurybia merita)
Origin: Native
Thick stemmed aster (Eurybia integrifolia)
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
Thick stemmed aster (Eurybia integrifolia)
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
Western American aster (Symphyotrichum ascendens)
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
Western aster (Symphyotrichum ascendens)
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
Western meadow aster (Symphyotrichum campestre)
Origin: Native
Western meadow aster (Symphyotrichum campestre)
Origin: Native
Western showy aster (Eurybia conspicua)
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
White-topped aster (Sericocarpus rigidus)
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
Asthmaweed (Conyza sumatrensis)
Purple avens (Geum rivale)
Distribution: British Columbia and Okanogan County, Washington, east to Alberta, south in the Rocky Mountains to New Mexico.
Habitat: Stream banks, lake shores, bogs and wet meadows, at high elevations.
Origin: Native
Ross's avens (Geum rossii)
Distribution: In Washington known only from the Wenatchee Mountains; Alaska and northern Canada south in Rocky and Cascades mountains to Nevada, Arizona and New Mexico; also in Far East Russia and Greenland.
Habitat: Arctic tundra, high gravelly meadows and scree slopes.
Origin: Native
Ross's avens (Geum rossii)
Distribution: In Washington known only from the Wenatchee Mountains; Alaska and northern Canada south in Rocky and Cascades mountains to Nevada, Arizona and New Mexico; also in Far East Russia and Greenland.
Habitat: Arctic tundra, high gravelly meadows and scree slopes.
Origin: Native
Water avens (Geum rivale)
Distribution: British Columbia and Okanogan County, Washington, east to Alberta, south in the Rocky Mountains to New Mexico.
Habitat: Stream banks, lake shores, bogs and wet meadows, at high elevations.
Origin: Native
Yellow avens (Geum aleppicum)
Distribution: Occasional east of the Cascades, British Columbia to California, more common east of the Rockies in southern Canada.
Habitat: Along streams and in marshy or damp woods.
Origin: Native
Alpine azalea (Kalmia procumbens)
Origin: Native
False azalea (Menziesia ferruginea)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Idaho, Montana, and Wyoming.
Habitat: Forest understory and edges from montane to subalpine.
Origin: Native
False azalea (Menziesia ferruginea)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Idaho, Montana, and Wyoming.
Habitat: Forest understory and edges from montane to subalpine.
Origin: Native
Trailing azalea (Kalmia procumbens)
Origin: Native