Vascular Plants

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

Browse by common name:
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Common names beginning with W:
Western wahoo (Euonymus occidentalis)
Distribution: Uncommon, west of the Cascades in southwestern Washington; British Columbia south to California.
Habitat: Moist woods.
Origin: Native
Flowers: May-June
Western wake-robin (Trillium ovatum)
Distribution: Widely distributed in the forested areas of Washington; British Columbia south to California, east to Montana and Idaho; also in Colorado and Wyoming.
Habitat: Open to dense moist forests at low to mid-elevations, often where boggy in the spring.
Origin: Native
Flowers: March-June
Purple wakerobin (Trillium petiolatum)
Distribution: East of the Cascades crest in Washington; Washington south to northeastern Oregon, east to Idaho.
Habitat: Streambanks and moist meadows and thickets at low to moderate elevations.
Origin: Native
Flowers: April-June
Slimleaf wall rocket (Diplotaxis tenuifolia)
Origin: Introduced
Aegean wallflower (Erysimum cheiri)
Distribution: West of the Cascades in Washington; scattered locations in western and eastern North America.
Habitat: Disturbed areas, often escaped from cultivation.
Origin: Introduced
Flowers: April-June
Pale wallflower (Erysimum occidentale)
Distribution: East of the Cascades in Washington; Washington to Nevada, east to Idaho.
Habitat: Sagebrush hills and valleys.
Origin: Native
Flowers: March-May
Sand-dwelling wallflower (Erysimum arenicola)
Distribution: In the Olympics, Cascades, and Blue mountains of Washington; British Columbia south to Oregon.
Habitat: Open ridges and rock crevices, moderate to high elevations in the mountains.
Origin: Native
Flowers: June-September
Small wallflower (Erysimum inconspicuum)
Distribution: Known from the northeast region in Washington; Alaska south to Oregon and Nevada, east across much of the U.S. and Canada to the Atlantic Coast.
Habitat: Rock outcroppings and roadsides where calcareous, also tolerant of alkaline soils.
Origin: Native
Flowers: June-July
Spreading wallflower (Erysimum repandum)
Distribution: East of the Cascades in Washington; distributed throughout much of North America.
Habitat: Wasteland in dry areas, plains and lower mountains.
Origin: Introduced from Eurasia
Flowers: April-June
Wallflower (Erysimum cheiri)
Distribution: West of the Cascades in Washington; scattered locations in western and eastern North America.
Habitat: Disturbed areas, often escaped from cultivation.
Origin: Introduced
Flowers: April-June
Western wallflower (Erysimum occidentale)
Distribution: East of the Cascades in Washington; Washington to Nevada, east to Idaho.
Habitat: Sagebrush hills and valleys.
Origin: Native
Flowers: March-May
Wormseed wallflower (Erysimum cheiranthoides)
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Disturbed areas including fields, roadsides and wastelots, often where moist.
Origin: Introduced from Eurasia
Flowers: June-August
Black walnut (Juglans nigra)
Distribution: In scattered locations across Washington, mostly east of the Cascades; central U.S. east to the Atlantic Coast.
Habitat: Disturbed areas and riparian zones, typically in the vicinity of urbanized areas where escaped from cultivation.
Origin: Introduced
Flowers: April-May
English walnut (Juglans regia)
Origin: Introduced from Europe
Japanese walnut (Juglans ailantifolia)
Origin: Introduced
Northern California walnut (Juglans hindsii)
Origin: Introduced
Spanish walnut (Castanea sativa)
Origin: Introduced from Europe
Sweet walnut (Castanea sativa)
Origin: Introduced from Europe
Wapato (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
Flowers: June-August
Wapato (Sagittaria latifolia)
Distribution: Occurring on both sides of the Cascades in Washington; Vancouver Island, British Columbia south to central California; primary distribution in central and eastern North America.
Habitat: Ditches, ponds, lakes, swampy areas.
Origin: Native
Flowers: July-September
Wart-removing-herb (Murdannia keisak)
Distribution: Widely introduced in southeastern United States; occasional in Washington.
Habitat: Ditches, swales and swamps, often in water.
Origin: Introduced
Flowers: August - October
Lesser wartcress (Lepidium didymum)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California and Arizona, and Texas eastward and northward to the Atlantic Coast.
Habitat: Roadsides, gardens and wasteland.
Origin: Introduced from South America (or possibly Eurasia)
Flowers: May-July
Wartcress (Lepidium didymum)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California and Arizona, and Texas eastward and northward to the Atlantic Coast.
Habitat: Roadsides, gardens and wasteland.
Origin: Introduced from South America (or possibly Eurasia)
Flowers: May-July
Wartweed (Euphorbia helioscopia)
Distribution: Introduced chiefly west of the Cascades in Washington; widely distributed throughout much of North America.
Habitat: Weed of cultivated areas and abondoned gardens.
Origin: Introduced from Eurasia
Flowers: April-July
Washington (Rudbeckia alpicola)
Origin: Native
Flowers: June - August
Water (Equisetum fluviatile)
Distribution: Alaska to Oregon, east across southern Canada and the northern tier of states in the United States.
Habitat: Shallow water, marshes and bogs, along muddy shores, from the lowlands to moderate elevations in the mountains.
Origin: Native
Disk water hyssop (Bacopa rotundifolia)
Origin: Introduced
Pacific clover-fern water-clover (Marsilea oligospora)
Origin: Native
Water-clover (Marsilea oligospora)
Origin: Native
Pacific water-dropwort (Oenanthe sarmentosa)
Distribution: West of the Cascades from British Columbia south to California.
Habitat: Low elevations; wet areas, often is standing water.
Origin: Native
Flowers: June - August
Bulblet-bearing water-hemlock (Cicuta bulbifera)
Distribution: British Columbia to southern Oregon, east to Newfoundland and Virginia,
Habitat: Marshes, bogs, wet meadows and standing water, lowlands to mountain valleys; uncommon in the Pacific Northwest.
Origin: Native
Flowers: August - September
Bulbous water-hemlock (Cicuta bulbifera)
Distribution: British Columbia to southern Oregon, east to Newfoundland and Virginia,
Habitat: Marshes, bogs, wet meadows and standing water, lowlands to mountain valleys; uncommon in the Pacific Northwest.
Origin: Native
Flowers: August - September
Douglas' water-hemlock (Cicuta douglasii)
Distribution: Widely distributed throughout Washington; British Columbia south to Oregon, east to Montana.
Habitat: Marshes and wet areas, low to moderate elevations in the mountains.
Origin: Native
Flowers: June-August
Spotted water-hemlock (Cicuta maculata)
Distribution: Known from historic collections in the Spokane area; widely distributed throughout much of North America.
Habitat: Marshes and wet areas.
Origin: Native
Flowers: June-August
Western water-hemlock (Cicuta douglasii)
Distribution: Widely distributed throughout Washington; British Columbia south to Oregon, east to Montana.
Habitat: Marshes and wet areas, low to moderate elevations in the mountains.
Origin: Native
Flowers: June-August
Cut-leaf water-horehound (Lycopus americanus)
Distribution: Both sides of the Cascades in Washington; throughout most of North America.
Habitat: Nonalkaline wetland, riparian, pond and lakeshore sites at low to moderate elevations.
Origin: Native
Flowers: June-August
European water-horehound (Lycopus europaeus)
Origin: Introduced from Europe
Rough water-horehound (Lycopus asper)
Distribution: Chiefly east of the Cascades; southern British Columbia to California, east to Colorado and Minnisota.
Habitat: Marshes and shores of streams and lakes; tolerant of alkali.
Origin: Native
Flowers: June-August
American water-lily (Nymphaea odorata)
Distribution: Widely distributed west of the Cascades in Washingtond, with scattered localities east of the Cascades; widely distributed througout central and eastern North America where native.
Habitat: Lowland ponds and lakes both sides of the Cascades.
Origin: Introduced
Flowers: June-October
Fragrant water-lily (Nymphaea odorata)
Distribution: Widely distributed west of the Cascades in Washingtond, with scattered localities east of the Cascades; widely distributed througout central and eastern North America where native.
Habitat: Lowland ponds and lakes both sides of the Cascades.
Origin: Introduced
Flowers: June-October
Pygmy water-lily (Nymphaea tetragona)
Origin: Native
Flowers: June - August
Cutleaf water-milfoil (Myriophyllum pinnatum)
Distribution: Known in Washington only from Thurston County; southern British Columbia to Oregon, also in eastern North America.
Habitat: Lakes, sloughs, ditches, slow streams.
Origin: Native
Flowers: June-August
Various-leaved water-milfoil (Myriophyllum heterophyllum)
Distribution: Known only from Puget Sound lowlands in Washington; British Columbia south to California; widely distributed east of the Mississippi River in Canada and the U.S where apparently it is native.
Habitat: Lakes and ponds.
Origin: Introduced
Flowers: May-October
Guadalupe water-nymph (Najas guadalupensis)
Distribution: Oregon south to Baja California, east to the Atlantic Coast.
Habitat: Fresh water.
Origin: Native
Flowers: June - August
American water-parsley (Oenanthe sarmentosa)
Distribution: West of the Cascades from British Columbia south to California.
Habitat: Low elevations; wet areas, often is standing water.
Origin: Native
Flowers: June - August
Hemlock water-parsnip (Sium suave)
Distribution: Southern British Columbia to central California, east to Newfoundland and Virginia.
Habitat: Swampy places and shallow water, in the valleys and foothills.
Origin: Native
Flowers: July - August
Mild water-pepper (Persicaria hydropiper)
Distribution: Introduced weed found in much of North America and throughout the Pacific Northwest.
Habitat: Swamps, ditches, and other wet places, mostly at low elevations.
Origin: Introduced
Flowers: July - September
European water-plantain (Alisma plantago-aquatica)
Distribution: Introduced occasionally, known from Seattle, Washington.
Habitat: Marshy areas, sometimes largely submerged
Origin: Introduced from Eurasia
Flowers: June - September
Fringed water-plantain (Damasonium californicum)
Distribution: Known only from Klickitat County in Washington; Washington south to California, east to southwest Idaho and western Navada.
Habitat: Sloughs, ditches and marshy fields.
Origin: Native
Flowers: June-July
Grass-leaved water-plantain (Alisma gramineum)
Distribution: East of the Cascades in Washington; British Columbia south to California, east to Minnesota and Wisconsin
Habitat: Marshy areas, often in standing water.
Origin: Native
Flowers: June-August
Narrow-leaf water-plantain (Alisma gramineum)
Distribution: East of the Cascades in Washington; British Columbia south to California, east to Minnesota and Wisconsin
Habitat: Marshy areas, often in standing water.
Origin: Native
Flowers: June-August
Northern water-plantain (Alisma triviale)
Distribution: Widely distributed throughout Washington; Alaska south to California, east across the northern half of North America to Newfoundland.
Habitat: Streams, lakes, ponds, wet ditches, wetlands, and cattle ponds.
Origin: Native
Flowers: June-September
Star water-plantain (Damasonium californicum)
Distribution: Known only from Klickitat County in Washington; Washington south to California, east to southwest Idaho and western Navada.
Habitat: Sloughs, ditches and marshy fields.
Origin: Native
Flowers: June-July
Autumn water-starwort (Callitriche hermaphroditica)
Distribution: Across northern North America, south to central California, northern New Mexico, the Great Lakes, and northeast United States.
Habitat: Sloughs and streams.
Origin: Native
Flowers: July - September
Different-leaved water-starwort (Callitriche heterophylla)
Distribution: North and South America and Greenland.
Habitat: Sloughs and slow-moving, fresh water.
Origin: Native
Flowers: April - July
Narrow-leaf water-starwort (Callitriche brutia)
Origin: Native
Northern water-starwort (Callitriche hermaphroditica)
Distribution: Across northern North America, south to central California, northern New Mexico, the Great Lakes, and northeast United States.
Habitat: Sloughs and streams.
Origin: Native
Flowers: July - September
Pond water-starwort (Callitriche stagnalis)
Distribution: Introduced in the Pacific Coast states, Montana, and some Eastern states
Habitat: Uncommon in streams, ponds and ditches
Origin: Introduced from Europe
Flowers: May - August
Spring water-starwort (Callitriche palustris)
Distribution: General in North America except Mexico and south and southeast United States.
Habitat: Sloughs and slow-moving fresh water.
Origin: Native
Flowers: June - August
Vernal water-starwort (Callitriche palustris)
Distribution: General in North America except Mexico and south and southeast United States.
Habitat: Sloughs and slow-moving fresh water.
Origin: Native
Flowers: June - August
Winged water-starwort (Callitriche marginata)
Distribution: Reported from eastern counties in Washington; British Columbia south to California.
Habitat: Ponds, lakes, slow-moving streams.
Origin: Native
Flowers: July-August
Pacific watercarpet (Chrysosplenium glechomifolium)
Distribution: West of the Cascades and mostly along the coast, British Columbia south to northwest California.
Habitat: Moist, usually swampy places, mostly at low elevations.
Origin: Native
Flowers: Late March - May
Australian waterclover (Marsilea mutica)
Distribution: Known from Snohomish and Pacific counties in Washington; southeastern U.S.
Habitat: Lowland ponds in water to 1 meter deep.
Origin: Introduced
Onerow watercress (Nasturtium microphyllum)
Origin: Introduced
Watercress (Nasturtium officinale)
Distribution: Distributed on both sides of the Cascades in Washington; widely distributed throughout North America.
Habitat: Riparian zones and other wet areas.
Origin: Introduced from Europe
Flowers: May-September
Rough-fruited waterhemp (Amaranthus tuberculatus)
Distribution: Cosmopolitan weed found throughout North America.
Habitat: Moist or wet disturbed areas, particularly in association with agriculture or roadsides.
Origin: Introduced from the Great Plains of the central United States
Flowers: April-June
Tall waterhemp (Amaranthus tuberculatus)
Distribution: Cosmopolitan weed found throughout North America.
Habitat: Moist or wet disturbed areas, particularly in association with agriculture or roadsides.
Origin: Introduced from the Great Plains of the central United States
Flowers: April-June
Ballhead waterleaf (Hydrophyllum capitatum)
Distribution: Mostly east of the Cascade summits in Washington; British Columbia south to California, east to Colorado.
Habitat: Somewhat moist open slopes and woodlands, foothills to mid-elevations in the mountains.
Origin: Native
Flowers: March-July
Fendler's waterleaf (Hydrophyllum fendleri)
Distribution: Widely distributed throughout much of Washington; British Columbia south to California, east to Utah.
Habitat: Thickets and moist open places, from lowlands to mid elevations in mountains.
Origin: Native
Flowers: May-August
Pacific waterleaf (Hydrophyllum tenuipes)
Distribution: West of the Cascades in Washington; Vancouver Island, British Columbia south to California.
Habitat: Moist woods at lower elevations.
Origin: Native
Flowers: May-July
Brazilian watermeal (Wolffia brasiliensis)
Distribution: Common in central and eastern United States, occasional in Washington to California, chiefly west of the Cascades
Habitat: Ponds and standing water at low elevations
Origin: Native
Columbian watermeal (Wolffia columbiana)
Origin: Native
Northern watermeal (Wolffia borealis)
Distribution: Oregon and Idaho, and most of the United States from Kansas east and Tennesee north
Habitat: Ponds and standing water at low elevations
Origin: Native
Watermelon (Citrullus lanatus)
Origin: Introduced
Watershield (Brasenia schreberi)
Distribution: Occurring chiefly west of the Cascades in Washington; Alaska to California, east to much of Canada and eastern United States.
Habitat: Shallow ponds and sluggish streams.
Origin: Native
Flowers: July-September
Brazilian waterweed (Egeria densa)
Distribution: Introduced from Washington to California, and across the southern half of the United States to the Atlantic; occasional west of the Cascades in Washington and Oregon
Habitat: Commonly used in aquaria, often escaping
Origin: Introduced from South America
Flowers: July - September
Nuttall's waterweed (Elodea nuttallii)
Distribution: Occasional in Washington, Oregon, Idaho and California; more common east to Maine and Virginia.
Habitat: Fresh to slightly brackish water.
Origin: Native
Flowers: July - September
Or common waterweed (Elodea canadensis)
Distribution: Throughout most of the United States
Habitat: Common in slow-moving, often alkaline water, in the Pacific Northwest
Origin: Native
Flowers: July - September
South American waterweed (Egeria densa)
Distribution: Introduced from Washington to California, and across the southern half of the United States to the Atlantic; occasional west of the Cascades in Washington and Oregon
Habitat: Commonly used in aquaria, often escaping
Origin: Introduced from South America
Flowers: July - September
Waterweed (Egeria densa)
Distribution: Introduced from Washington to California, and across the southern half of the United States to the Atlantic; occasional west of the Cascades in Washington and Oregon
Habitat: Commonly used in aquaria, often escaping
Origin: Introduced from South America
Flowers: July - September
Western waterweed (Elodea nuttallii)
Distribution: Occasional in Washington, Oregon, Idaho and California; more common east to Maine and Virginia.
Habitat: Fresh to slightly brackish water.
Origin: Native
Flowers: July - September
California waterwort (Elatine californica)
Origin: Native
Chilean waterwort (Elatine chilensis)
Origin: Native
Wayfaring-tree (Viburnum lantana)
Origin: Introduced
Prairie wedgescale (Sphenopholis obtusata)
Origin: Native
Flowers: June - July
Slender wedgescale (Sphenopholis intermedia)
Origin: Native
Jimson weed (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
Flowers: June-August
Klamath weed (Hypericum perforatum)
Distribution: Widespread on both sides of the Cascades crest in Washington; widespread throughout much of North America.
Habitat: Noxious weed of fields, meadows, roadsides, forest edge, wastelots, and other disturbed areas from the lowlands to near subalpine.
Origin: Introduced from Europe
Flowers: June-July
Pahute weed (Suaeda calceoliformis)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout North America from Alaska south to California, east to the Great Plains, and also along the coast of eastern North America.
Habitat: Open, moist to wet areas, typically where saline.
Origin: Native
Flowers: June-August
Pineapple weed (Matricaria discoidea)
Distribution: Widely distributed throughout Washington; widely distributed throughout much of North America.
Habitat: Disturbed areas, moist to dry.
Origin: Native
Flowers: May-September
Poverty weed (Iva axillaris)
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
Pygmy weed (Crassula connata)
Distribution: Known in Washington only from San Juan County; British Columbia south to California, east to Arizona and Texas.
Habitat: Sandy areas, paths and roadsides.
Origin: Native
Flowers: May-June
Vinegar weed (Trichostema lanceolatum)
Origin: Native
Water pygmy weed (Crassula aquatica)
Distribution: Occurring in scattered localities across Washington; Alaska south to California, east to the Rocky Mountains, and in the southeastern and northeastern regions of North America.
Habitat: Mud flats and vernal pools.
Origin: Native
Flowers: April-August
Woolly weed (Hieracium scouleri)
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
Weld (Reseda luteola)
Distribution: Scattered locations in Washington; British Columbia south to California; scattered locations in central and eastern North America.
Habitat: Disturbed ground.
Origin: Introduced from Europe
Flowers: May-September
Coast range western-cabbage (Caulanthus lasiophyllus)
Origin: Native
Bread wheat (Triticum aestivum)
Distribution: Introduced world-wide, but fails to persist more that a few seasons on its own.
Habitat: Cultivated in fields.
Origin: Introduced
Flowers: April - June
Narrow-leaved cow wheat (Melampyrum lineare)
Distribution: Occurring in the northeastern corner of Washington; British Columbia south to Washington, east across the northern half of North America to the Atlantic Coast.
Habitat: Forest openings, rocky outcroppings, and wet areas from low to moderate elevations.
Origin: Native
Flowers: July-August
?bluebunch wheatgrass (Pseudoroegneria spicata)
Distribution: British Columbia south, chiefly east of the Cascade crests, but also in the coastal mountains, to California, east to the Dakotas and New Mexico.
Habitat: From the plains to mid-elevations in the mountains.
Origin: Native
Flowers: June - August
Arctic wheatgrass (Elymus violaceus)
Origin: Native
Bearded wheatgrass (Elymus violaceus)
Origin: Native
Bluebunch wheatgrass (Pseudoroegneria spicata)
Distribution: British Columbia south, chiefly east of the Cascade crests, but also in the coastal mountains, to California, east to the Dakotas and New Mexico.
Habitat: From the plains to mid-elevations in the mountains.
Origin: Native
Flowers: June - August
Crested wheatgrass (Agropyron cristatum)
Distribution: Introduced for forage purposes in many areas of western United States, becoming widely established.
Habitat: Dry, open areas.
Origin: Introduced
Flowers: June - August
Intermediate wheatgrass (Thinopyrum intermedium)
Origin: Introduced
Flowers: June - August
Siberian wheatgrass (Agropyron fragile)
Origin: Introduced
Sierra wheatgrass (Elymus sierrae)
Origin: Native
Slender wheatgrass (Elymus trachycaulus)
Origin: Native
Old man's whiskers (Geum triflorum)
Distribution: Occurring on both sides of the Cascades in Washington; widespread throughout the northern and western regions of North America.
Habitat: Moister places in the sagebrush plains and foothills to subalpine ridges.
Origin: Native
Flowers: April-August
Old-man's whiskers (Geum triflorum)
Distribution: Occurring on both sides of the Cascades in Washington; widespread throughout the northern and western regions of North America.
Habitat: Moister places in the sagebrush plains and foothills to subalpine ridges.
Origin: Native
Flowers: April-August
Asian white-top (Lepidium chalepense)
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Disturbed areas, especially where dry, often associated with agriculture.
Origin: Introduced from Asia
Flowers: May-June
Swedish whitebeam (Sorbus intermedia)
Origin: Introduced
Whitetop (Lepidium appelianum)
Distribution: Widely distributed throughout many areas in Washington, though more common east of the Cascades crest; widely distributed throughout much of North America.
Habitat: Disturbed soil, waste areas, in dry and moist places.
Origin: Introduced from Asia
Flowers: April-August
Alaska whitlow-grass (Draba stenoloba)
Origin: Native
Flowers: May - August
Alkali false whitlow-grass (Cusickiella douglasii)
Distribution: Occurring in the south-central area of Washington along the Oregon border; Washington south to California, east to Idaho, Nevada, and Utah.
Habitat: Open, rocky ridges of the sagebrush desert, up into the lower mountains.
Origin: Native
Flowers: April-June
Alpine whitlow-grass (Draba aureola)
Distribution: Currently only known only from the Mt. Rainier area in Washington; Washington south to northern California
Habitat: Alpine areas, including scree and moraine areas.
Origin: Native
Flowers: July-August
Broad-pod whitlow-grass (Draba platycarpa)
Origin: Native
Flowers: March - June
Carolina whitlow-grass (Draba reptans)
Origin: Native
Flowers: March - May
Dense-leaf whitlow-grass (Draba densifolia)
Distribution: Occurring east of the Cascades crest in Washington; Alaska south to California, east to Alberta, Idaho, Wyoming, Nevada and Utah.
Habitat: Open, rocky places from mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Douglas' whitlow-grass (Cusickiella douglasii)
Distribution: Occurring in the south-central area of Washington along the Oregon border; Washington south to California, east to Idaho, Nevada, and Utah.
Habitat: Open, rocky ridges of the sagebrush desert, up into the lower mountains.
Origin: Native
Flowers: April-June
Few-seeded draba whitlow-grass (Draba oligosperma)
Distribution: In the North Cascades mountains in Washington; Alaska south to California, east to Colorado.
Habitat: Plains to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
Golden draba whitlow-grass (Draba aurea)
Origin: Native
Flowers: June - August
Great alpine whitlow-grass (Draba aureola)
Distribution: Currently only known only from the Mt. Rainier area in Washington; Washington south to northern California
Habitat: Alpine areas, including scree and moraine areas.
Origin: Native
Flowers: July-August
Mt. Lassen draba whitlow-grass (Draba aureola)
Distribution: Currently only known only from the Mt. Rainier area in Washington; Washington south to northern California
Habitat: Alpine areas, including scree and moraine areas.
Origin: Native
Flowers: July-August
Slender whitlow-grass (Draba albertina)
Distribution: Occurring in the the Olympics and Cascades Mountains in Washington; Alaska south to California, east to the Rocky Mountains.
Habitat: From subalpine meadows and forest openings to alpine meadows.
Origin: Native
Flowers: May-August
Snowbed whitlow-grass (Draba crassifolia)
Distribution: Occurring in the Olympic Mountains and North Cascades in Washington; Alaska south to Washington, Nevada, east to the Rocky Mountains; east across northern Canada to Greenland; northern Europe.
Habitat: Subalpine and alpine meadows, often in rock crevices and outcroppings.
Origin: Native
Flowers: June-August
Spring whitlow-grass (Draba verna)
Distribution: Widely distributed throughout Washington; widely distributed throughout North America; circumboreal.
Habitat: Shrub-steppe, grasslands, and open disturbed areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: February-May
Whitlow-grass (Draba aurea)
Origin: Native
Flowers: June - August
Whitlow-grass (Draba aureola)
Distribution: Currently only known only from the Mt. Rainier area in Washington; Washington south to northern California
Habitat: Alpine areas, including scree and moraine areas.
Origin: Native
Flowers: July-August
Whitlow-grass (Draba oligosperma)
Distribution: In the North Cascades mountains in Washington; Alaska south to California, east to Colorado.
Habitat: Plains to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
Woodland whitlow-grass (Draba nemorosa)
Distribution: In scattered locations on both sides of the Cascades crest in Washington; Alaska south to California, east across the northern half of the U.S. and Canada to the Atlantic Coast.
Habitat: Disturbed open areas and forest edges at low moderate elevations.
Origin: Native
Flowers: March-June
Lancefruit draba whitlow-wort (Draba lonchocarpa)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Northwest Territories, south in Rocky mountains to Colorado.
Habitat: Alpine slopes, talus, and rocky outcroppings.
Origin: Native
Flowers: June-August
Whitlow-wort (Draba incerta)
Distribution: Occurring in the Cascades and Olympic Mountains in Washington; British Columbia and Alberta south to Washington, east to Montana and Wyoming.
Habitat: Alpine and subalpine slopes.
Origin: Native
Flowers: June-August
Whitlow-wort (Draba lonchocarpa)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Northwest Territories, south in Rocky mountains to Colorado.
Habitat: Alpine slopes, talus, and rocky outcroppings.
Origin: Native
Flowers: June-August
Yellowstone draba whitlow-wort (Draba incerta)
Distribution: Occurring in the Cascades and Olympic Mountains in Washington; British Columbia and Alberta south to Washington, east to Montana and Wyoming.
Habitat: Alpine and subalpine slopes.
Origin: Native
Flowers: June-August
Wild ginger (Asarum caudatum)
Distribution: Widely distributed throughout Washington except in central lowlands; British Columbia south to Oregon, east to Idaho and Montana.
Habitat: Moist, shady woods at low to mid-elevations in the mountains.
Origin: Native
Flowers: April-July
Northern wild rice (Zizania palustris)
Origin: Introduced
Blue wild-rye (Elymus glaucus)
Distribution: Southern Alaska south to California, east to Ontario and Indiana.
Habitat: Prairies, open woods, and dry to moist hillsides, from the lowlands to mid-elevations in the mountains.
Origin: Native
Flowers: June - August
Awnless wildrye (Elymus curvatus)
Origin: Native
Giant wildrye (Leymus condensatus)
Origin: Native
Vancouver wildrye (Leymus ×vancouverensis)
Origin: Native
Sweet William (Dianthus barbatus)
Distribution: Introduced ornamental that occastionally escapes in western Washington and Oregon.
Habitat: Wasteland and disturbed soil.
Origin: Introduced from Europe
Flowers: June - August
Alpine willow (Salix petrophila)
Distribution: Northern Cascades of Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Alpine areas, often near melting snowbanks.
Origin: Native
Flowers: July-Aug.
Arctic willow (Salix arctica)
Distribution: Alaska, British Columbia to Labrador; northern Cascades in Washington, Wallowa Mountains in Oregon, and the Rockies in Idaho and Montana
Habitat: In wet to dry areas in the alpine.
Origin: Native
Flowers: June-August
Arroyo willow (Salix lasiolepis)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho, south to the southern Rocky Mountains and Texas.
Habitat: Riparian corridors from low to moderate elevations.
Origin: Native
Flowers: April-June
Barclay's willow (Salix barclayi)
Distribution: Chiefly in the Olympic and Cascade mountains of Washington; Alaska east to Northwest Territories, south to Oregon and Wyoming.
Habitat: Lakes, streams, and other riparian areas in subalpine and alpine zone.
Origin: Native
Flowers: June-August
Basket willow (Salix purpurea)
Origin: Introduced
Bebb's willow (Salix bebbiana)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America except for southcentral and southeastern U.S.
Habitat: Lakes, streams, and other riparian areas from low to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
Bog willow (Salix pedicellaris)
Distribution: Chiefly in the Cascades of Washington; Yukon Territory south to Oregon, east across Canada and northern U.S. to the Atlantic Coast.
Habitat: Bogs, fens, and similar wet meadows.
Origin: Native
Flowers: April-June
Booth's willow (Salix boothii)
Distribution: In the Cascades of Washington; distributed in western North America from British Columbia east to Saskatchewan, south to California, east to Arizona.
Habitat: Wet subalpine meadows, streambanks, lakeshores, and other riparian areas.
Origin: Native
Flowers: May-July
Cascade willow (Salix cascadensis)
Distribution: In the Cascade Mountains of Washington; British Columbia south in the Cascades to Mt. Rainier, occasionally east to northeast Oregon, Idaho and Montana, south to Utah and Colorado.
Habitat: High elevations in the mountains in subalpine and alpine habitats
Origin: Native
Flowers: June-August
Coastal willow (Salix hookeriana)
Distribution: Chiefly west of the Cascades in Washington; British Columbia south to California.
Habitat: Moist, often swamps areas, from the sea coast to mid-elevations in the mountains.
Origin: Native
Flowers: March-April
Corkscrew willow (Salix matsudana)
Origin: Introduced
Coyote willow (Salix exigua)
Distribution: Chiefly east of the Cascades in Washington; British Columbia and Alberta south to California, east through the Rocky Mountains to Nebraska and Texas.
Habitat: Riparian areas, gravel bars, lake and pond shore margins
Origin: Native
Flowers: April-May
Crack willow (Salix fragilis)
Origin: Introduced
Drummond's willow (Salix drummondiana)
Distribution: In the East Cascades and mountains of eastern Washington; Yukon Territory east to Northwest Territories, south to California, east through the Rocky Mountains.
Habitat: Streambanks, lakeshores, floodplains, and other riparian areas in montane and subalpine habitats.
Origin: Native
Flowers: April-June
Dusky willow (Salix melanopsis)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the northern and central Rocky Mountains.
Habitat: Riparian zones including streambanks, pond and lake margins, and subalpine meadows.
Origin: Native
Flowers: June-July
Dwarf snow willow (Salix nivalis)
Distribution: In the Olympic and Cascade mountains of Washington; British Columbia and Alberta, south to California, east to Colorado.
Habitat: Subalpine meadows and alpine areas.
Origin: Native
Flowers: June-August
False mountain willow (Salix pseudomonticola)
Distribution: Chiefly in the Cascade Mountains in Washington; Alaska to Washington, east to Quebec.
Habitat: Wet meadows, forested wetlands, and other riparian areas in the mountains.
Origin: Native
Flowers: April-June
Farr's willow (Salix farriae)
Distribution: Known only from Okanogan County in Washington; Yukon south to Oregon, east to Montana, Idaho and Wyoming.
Habitat: Wet meadows and riparian zones from montane to subalpine.
Origin: Native
Flowers: June-July
Geyer's willow (Salix geyeriana)
Distribution: Both sides of the Cascades in Washington; widespread in western North America from British Columbia south to California, east to the Rocky Mountains.
Habitat: Lowland riparian areas including streambanks and pond and lake margins.
Origin: Native
Flowers: April-June
Gray willow (Salix bebbiana)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America except for southcentral and southeastern U.S.
Habitat: Lakes, streams, and other riparian areas from low to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
Gray willow (Salix glauca)
Origin: Native
Long-beak willow (Salix bebbiana)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America except for southcentral and southeastern U.S.
Habitat: Lakes, streams, and other riparian areas from low to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
Maccalla's willow (Salix maccalliana)
Distribution: East of the Cascades in Washington; Yukon Territory south to Washington, east across northern North America to Quebec.
Habitat: Wet meadows, bogs, fens, streambanks and lakeshores from low to moderate elevations in the mountains.
Origin: Native
Flowers: May-June
Mackenzie's willow (Salix prolixa)
Distribution: Widely distributed throughout Washington; British Columbia to California, east to Newfoundland and Virginia.
Habitat: Along streams in the lowlands to lower valleys in the mountains.
Origin: Native
Flowers: April-June
Narrow-leaf willow (Salix exigua)
Distribution: Chiefly east of the Cascades in Washington; British Columbia and Alberta south to California, east through the Rocky Mountains to Nebraska and Texas.
Habitat: Riparian areas, gravel bars, lake and pond shore margins
Origin: Native
Flowers: April-May
One-color willow (Salix monochroma)
Origin: Native
Pacific willow (Salix lasiandra)
Distribution: Widely distributed throughout Washington; Alaska south to California, east to Manitoba and New Mexico.
Habitat: Riparian areas from the coast to the mountains.
Origin: Native
Flowers: March-June
Peach-leaf willow (Salix amygdaloides)
Distribution: East side of the Cascades in Washington; widely distributed throughout North America except in extreme northwestern and southeastern regions.
Habitat: Wetlands, streambanks, and other riparian areas.
Origin: Native
Flowers: March-May
Plane-leaf willow (Salix planifolia)
Distribution: Chiefly in the Cascade Mountains of Washington; widely distributed throughout western North America and across northern half of North America to the Atlantic Coast.
Habitat: Wet meadows, lake margins, streambanks and other riparian areas in the alpine and subalpine.
Origin: Native
Flowers: May-July
Purple willow (Salix purpurea)
Origin: Introduced
Rock willow (Salix vestita)
Distribution: North Cascade Mountains in Washington; British Columbia south to Oregon, east across northern North America to the Canadian Maritime Provinces.
Habitat: Moist forest opening, streambanks, and other riparian areas in montane and subalpine habitats.
Origin: Native
Flowers: June-July
Sage willow (Salix candida)
Distribution: In the mountains of northeastern and southeastern Washington; widespread across North America from Alaska south to Washington, east through central U.S. to Canadian Maritimes.
Habitat: Lakeshores, pond margins, streambanks, and other riparian areas.
Origin: Native
Flowers: April-June
Sage-leaf willow (Salix candida)
Distribution: In the mountains of northeastern and southeastern Washington; widespread across North America from Alaska south to Washington, east through central U.S. to Canadian Maritimes.
Habitat: Lakeshores, pond margins, streambanks, and other riparian areas.
Origin: Native
Flowers: April-June
Scouler's willow (Salix scouleriana)
Distribution: Widely distributed throughout Washington; Alaska south to California, east to Manitoba and New Mexico.
Habitat: Moist woods and streambanks, lowlands to moderate elevations in the mountains.
Origin: Native
Flowers: March-June
Sessile-leaf willow (Salix sessilifolia)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to Oregon.
Habitat: Riparian corridors at low to moderate elevations.
Origin: Native
Flowers: May-July
Short-fruited willow (Salix brachycarpa)
Distribution: Occurring east of the Cascades crest in Washington; Yukon Territory south to California, east to the Rocky Mountains; occurring across Canada.
Habitat: Riparian areas at low to moderate elevations.
Origin: Native
Flowers: April-June
Shortfruit willow (Salix brachycarpa)
Distribution: Occurring east of the Cascades crest in Washington; Yukon Territory south to California, east to the Rocky Mountains; occurring across Canada.
Habitat: Riparian areas at low to moderate elevations.
Origin: Native
Flowers: April-June
Sierran willow (Salix eastwoodiae)
Distribution: In the mountains of Washington; Washington south to California, east to Montana, Wyoming, and Nevada.
Habitat: Alpine and subalpine meadows.
Origin: Native
Flowers: May-July
Sitka willow (Salix sitchensis)
Distribution: Chiefly west of the east base of the Cascades in Washington; Alaska to California, east to Idaho.
Habitat: Moist woods and streambanks, lowlands to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
Small-fruit willow (Salix brachycarpa)
Distribution: Occurring east of the Cascades crest in Washington; Yukon Territory south to California, east to the Rocky Mountains; occurring across Canada.
Habitat: Riparian areas at low to moderate elevations.
Origin: Native
Flowers: April-June
Tea-leaved willow (Salix planifolia)
Distribution: Chiefly in the Cascade Mountains of Washington; widely distributed throughout western North America and across northern half of North America to the Atlantic Coast.
Habitat: Wet meadows, lake margins, streambanks and other riparian areas in the alpine and subalpine.
Origin: Native
Flowers: May-July
Tweedy's willow (Salix tweedyi)
Distribution: Chiefly North Cascade Mountains in Washington; British Columbia south to Washington, east to Montana, Idaho and Wyoming.
Habitat: Wet meadows, lake margins, streambanks, and other riparian areas in alpine and subalpine.
Origin: Native
Flowers: July-August
Under-green willow (Salix commutata)
Distribution: Chiefly in the Olympic and Cascade mountains of Washington; Alaska and Yukon south to Oregon, occasionally east to idaho and Montana.
Habitat: Moist areas, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-September
Variable willow (Salix commutata)
Distribution: Chiefly in the Olympic and Cascade mountains of Washington; Alaska and Yukon south to Oregon, occasionally east to idaho and Montana.
Habitat: Moist areas, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-September
Weeping willow (Salix ×sepulcralis)
Origin: Introduced
Willow weed (Persicaria lapathifolia)
Distribution: Widely distributed throughout Washington; widely distributed throughout all of North America.
Habitat: Streambanks, pond and lakeshores and other wet places.
Origin: Native
Flowers: May-September
Broad-leaved willow-herb (Epilobium montanum)
Origin: Introduced
Bronzy willow-herb (Epilobium komarovianum)
Origin: Introduced
Dwarf willow-herb (Epilobium obscurum)
Origin: Introduced
Hornemann's willow-herb (Epilobium hornemannii)
Distribution: Widely distributed throughout Washington; Alaska south to California, east to South Dakota and New Mexico.
Habitat: Wet rocky areas and streambanks, low to subalpine elevations.
Origin: Native
Flowers: June-September
Red willow-herb (Chamaenerion latifolium)
Distribution: Occurring in most mountainous areas of Washington except the southeast corner; Alaska south to the Sierra Nevada of California, east to Montana and Colorado.
Habitat: River bars, along streams, and drier subalpine to alpine slopes.
Origin: Native
Flowers: June-September
Alpine willowherb (Epilobium anagallidifolium)
Distribution: Both sides of the Cascades in Washington; Alaska to Greenland, throughout western and northeastern North America.
Habitat: Alpine meadows, streambanks, and riparian areas.
Origin: Native
Flowers: June-September
Autumn willowherb (Epilobium brachycarpum)
Distribution: Throughout Washington; British Columbia south to California, east to Wisconsin in the north and New Mexico in the south.
Habitat: Common in dry, open meadows and grasslands to lightly wooded areas.
Origin: Native
Flowers: July-August
Bog willowherb (Epilobium leptophyllum)
Origin: Introduced
Brook willowherb (Epilobium torreyi)
Distribution: East of the Cascades in Washington from Kittitas County south; both sides of the Cascades in Oregon, south to central California, east to Idaho and Nevada.
Habitat: Places that are soggy with standing water in winter and spring, drying in summer.
Origin: Native
Flowers: June-July
California willowherb (Epilobium minutum)
Distribution: Both sides of the Cascades crest in Washington; common from British Columbia south to California, east to Montana.
Habitat: Dry or gravelly soil, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-August
Chaparral willowherb (Epilobium minutum)
Distribution: Both sides of the Cascades crest in Washington; common from British Columbia south to California, east to Montana.
Habitat: Dry or gravelly soil, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-August
Ciliate willowherb (Epilobium ciliatum)
Distribution: Widely distributed throughout all of Washington; widespread throughout much of North America.
Habitat: Moist soil from lowlands to moderate elevations in the mountains.
Origin: Native
Flowers: June-August
Ciliate willowherb (Epilobium glandulosum)
Distribution: Both sides of the Cascades in Washington; Alaska south to California, east to the Rocky Mts.; eastern North America.
Habitat: Moist meadows and riparian areas from coastal elevations to subalpine.
Origin: Native
Flowers: June-August
Dense-flower willowherb (Epilobium densiflorum)
Distribution: Both sides of the Cascades in Washington; Vancouver Island, British Columbia south to Baja California, east to Montana and Nevada.
Habitat: Boggy areas with standing water in winter and spring; occasional streamside.
Origin: Native
Flowers: July-September
Glandular willowherb (Epilobium hallianum)
Distribution: Occurring in the mountains throughout Washington; occurring throughout western North America.
Habitat: Moist to wet areas from montane to alpine habitats.
Origin: Native
Flowers: June-August
Hall's willowherb (Epilobium hallianum)
Distribution: Occurring in the mountains throughout Washington; occurring throughout western North America.
Habitat: Moist to wet areas from montane to alpine habitats.
Origin: Native
Flowers: June-August
Marsh willowherb (Epilobium palustre)
Distribution: Both sides of the Cascades in Washington; Alaska east to the Atlantic coast; south in the Rocky Mountains to Colorado.
Habitat: Wet soil, often in bogs.
Origin: Native
Flowers: June-August
Olympic Mountain willowherb (Epilobium mirabile)
Origin: Native
Oregon willowherb (Epilobium oregonense)
Distribution: Both sides of the Cascades in Washington; British Columbia south to Arizona, east to Montana and Colorado.
Habitat: Streambanks, bogs, and wet meadows from moderate elevations in mountains to alpine.
Origin: Native
Flowers: June-September
Pimpernel willowherb (Epilobium anagallidifolium)
Distribution: Both sides of the Cascades in Washington; Alaska to Greenland, throughout western and northeastern North America.
Habitat: Alpine meadows, streambanks, and riparian areas.
Origin: Native
Flowers: June-September
Rocky Mountain willowherb (Epilobium saximontanum)
Origin: Native
Slender-fruit willowherb (Epilobium leptocarpum)
Origin: Native
Small-flowered willowherb (Epilobium minutum)
Distribution: Both sides of the Cascades crest in Washington; common from British Columbia south to California, east to Montana.
Habitat: Dry or gravelly soil, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-August
Smooth willowherb (Epilobium campestre)
Distribution: Central and eastern portion of Washington; British Columbia east to Saskatchewan, south to Arizona and California.
Habitat: Mud flats, vernal pools.
Origin: Native
Flowers: June-July
Smooth willowherb (Epilobium glaberrimum)
Distribution: Widely distributed throughtout much of the mountainous areas of Washington; British Ciolumbia south to California, east to Montana, Idaho and Colorado.
Habitat: Wet places at mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Tall annual willowherb (Epilobium brachycarpum)
Distribution: Throughout Washington; British Columbia south to California, east to Wisconsin in the north and New Mexico in the south.
Habitat: Common in dry, open meadows and grasslands to lightly wooded areas.
Origin: Native
Flowers: July-August
Talus willowherb (Epilobium clavatum)
Distribution: Both sides of the Cascades in Washington; Alaska to California, east to Montana and Colorado.
Habitat: Moist meadows and talus slopes in the mountains, subalpine.
Origin: Native
Flowers: June-September
Watson's willowherb (Epilobium ciliatum)
Distribution: Widely distributed throughout all of Washington; widespread throughout much of North America.
Habitat: Moist soil from lowlands to moderate elevations in the mountains.
Origin: Native
Flowers: June-August
White-flower willowherb (Epilobium lactiflorum)
Distribution: Widely distributed on both sides of the Cascades in Washington; Alaska south to California, east to Montana, Colorado and New Mexico.
Habitat: Wet meadows and seeps, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-September
Yellow willowherb (Epilobium luteum)
Distribution: In the Olympics and Cascades in Washington; Alaska south to California.
Habitat: Stream banks and wet areas at mid- to high elevations in the mountains.
Origin: Native
Flowers: July-September
Columbian windflower (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
Flowers: April-May
Piper's windflower (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
Flowers: April-August
Silky windgrass (Apera spica-venti)
Origin: Introduced
Windmill-pink (Silene gallica)
Distribution: Occurring in the lowlands west of the Cascades crest in Washington; British Columbia south to California, east to Idaho and Arizona; also in the eastern half of the U.S.
Habitat: Weed of disturbed soil and wasteland.
Origin: Introduced from Europe
Flowers: May-July
Wingscale (Atriplex canescens)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to the Great Plains.
Habitat: Saline areas in the prairies.
Origin: Native
Flowers: June-August
Bitter wintercress (Barbarea vulgaris)
Distribution: Chiefly west of the Cascades in Washington, with scattered locations east of the Cascades; distributed throughout much of the United States.
Habitat: Garden escape, found chiefly in wet places.
Origin: Introduced from Eurasia
Flowers: April-July
Early wintercress (Barbarea verna)
Origin: Introduced from Eurasia
Flowers: April - July
Winterfat (Krascheninnikovia lanata)
Distribution: Occurring east of the Cascades in Washington; Washington south on the east side of the Cascades and Sierra Nevada to California, east to Idaho and Texas.
Habitat: Plains and foothills, often in saline or alkaline soil.
Origin: Native
Flowers: May-July
Alpine wintergreen (Gaultheria humifusa)
Distribution: In the Olympics and Cascades mountains of Washington; British Columbia south to northern California, east to the Rocky Mountains from Alberta to Colorado.
Habitat: Subalpine to alpine, usually where moist to wet.
Origin: Native
Flowers: July-August
Common pink wintergreen (Pyrola asarifolia)
Distribution: Widely distributed throughout much of forested Washington except for the southeast corner; Alaska south to California, east to Colorado in the west, and across the northern half of the United States to the Atlantic.
Habitat: Moist ground in woodlands and forests, lowlands to mid-elevations.
Origin: Native
Flowers: June-September
Green-flower wintergreen (Pyrola chlorantha)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains and across northern U.S. and Canada to the Atlantic Coast.
Habitat: Chiefly in coniferous forests at moderate to mid-elevations, usually where moist.
Origin: Native
Flowers: June-August
Leafless wintergreen (Pyrola aphylla)
Origin: Native
Lesser wintergreen (Pyrola minor)
Distribution: Occurring on both sides of the Cascades in Washington; Alaska south to California, east to the Rocky Mountains; east across Canada and northern U.S. to the Atlantic Coast.
Habitat: Uncommon, mostly in moist areas in coniferous woods, moderate to high elevations in the mountains.
Origin: Native
Flowers: June-August
Liver-leaf wintergreen (Pyrola asarifolia)
Distribution: Widely distributed throughout much of forested Washington except for the southeast corner; Alaska south to California, east to Colorado in the west, and across the northern half of the United States to the Atlantic.
Habitat: Moist ground in woodlands and forests, lowlands to mid-elevations.
Origin: Native
Flowers: June-September
Slender wintergreen (Gaultheria ovatifolia)
Distribution: Chiefly in the Olympics and Cascades mountains in Washington, but also in the northeastern part of the State; British Columbia south to California, east to Idaho and Montana.
Habitat: Forested areas from fairly dry Ponderosa pine to subalpine bogs.
Origin: Native
Flowers: June-August
Snowline wintergreen (Pyrola minor)
Distribution: Occurring on both sides of the Cascades in Washington; Alaska south to California, east to the Rocky Mountains; east across Canada and northern U.S. to the Atlantic Coast.
Habitat: Uncommon, mostly in moist areas in coniferous woods, moderate to high elevations in the mountains.
Origin: Native
Flowers: June-August
White wintergreen (Pyrola elliptica)
Origin: Native
White-vein wintergreen (Pyrola picta)
Distribution: Both sides of the Cascades, British Columbia to California, east to South Dakota and New Mexico
Habitat: Coniferous woods, especially ponderosa pine, moderate to mid-elevations in the mountains
Origin: Native
Flowers: June - August
Wiregrass (Carex lasiocarpa)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to Idaho and Montana in our area; also throughout northeastern North America.
Habitat: Wet meadows, bogs, fens, streambanks, and lakeshores where sometimes forming floating mats.
Origin: Native
Flowers: May-September
Small wirelettuce (Stephanomeria exigua)
Origin: Native
Stiff branched wirelettuce (Stephanomeria paniculata)
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
False wireweed (Rigiopappus leptocladus)
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
Witchgrass (Panicum capillare)
Distribution: Introduced and weedy in much of the United States and southern Canada.
Habitat: Moist and irrigated areas, along streams and around ponds.
Origin: Native
Flowers: June - September
Dyer's woad (Isatis tinctoria)
Distribution: Known only from scattered locations in central Washington; British Columbia south to California, east to the Rocky Mountains; also occurring in parts of central and eastern North America.
Habitat: Disturbed dry ground, pastures, and roadsides, where often escaped from cultivation.
Origin: Introduced from Eurasia
Flowers: April-June
Woad (Isatis tinctoria)
Distribution: Known only from scattered locations in central Washington; British Columbia south to California, east to the Rocky Mountains; also occurring in parts of central and eastern North America.
Habitat: Disturbed dry ground, pastures, and roadsides, where often escaped from cultivation.
Origin: Introduced from Eurasia
Flowers: April-June
Chinese wolfberry (Lycium chinense)
Origin: Introduced
Wolfberry (Elaeagnus commutata)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Quebec, south into Idaho, Montana and Utah.
Habitat: Gravel benches and scabland, commonly along watercourses.
Origin: Native
Flowers: June-July
Wolfberry (Symphoricarpos occidentalis)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to Utah, east to the Atlantic Coast.
Habitat: Prairies, forest margins, and bottomlands from low to mid-elevations.
Origin: Native
Flowers: June-August
Eastern showy wood-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
Flowers: July - September
Siberian 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
Flowers: July - August
Slender wood-reed (Cinna latifolia)
Distribution: Alaska to Newfoundland, south on both sides of the Cascades, Washington to California, east to Colorado; also Minnesota to Maine, south to Tennessee
Habitat: Moist woods and meadows, sea level to subalpine
Origin: Native
Flowers: June - August
Short-stalked wood-rush (Luzula subsessilis)
Origin: Native
Creeping yellow wood-sorrel (Oxalis corniculata)
Distribution: Scattered locations throughout Washington; distributed widely throughout North America.
Habitat: A weed of gardens, disturbed areas, and waste places.
Origin: Introduced from Europe
Flowers: May-October
Great wood-sorrel (Oxalis trilliifolia)
Distribution: West slope of the Cascades in Washington; Washington south to northwest California.
Habitat: Meadows and moist woods in the coastal mountains and up to 6000 feet in the Cascades.
Origin: Native
Flowers: May-August
Oregon wood-sorrel (Oxalis oregana)
Distribution: Olympic Mountains and west slope of the Cascades in Washington; British Columbia south to California.
Habitat: Moist woods, low to moderate elevations.
Origin: Native
Flowers: April-September
Slender yellow wood-sorrel (Oxalis dillenii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington south to Oregon, east across North America to the Atlantic Coast.
Habitat: Open areas, often where moist, at low elevations.
Origin: Introduced
Flowers: February-October
Trillium-leaf wood-sorrel (Oxalis trilliifolia)
Distribution: West slope of the Cascades in Washington; Washington south to northwest California.
Habitat: Meadows and moist woods in the coastal mountains and up to 6000 feet in the Cascades.
Origin: Native
Flowers: May-August
Upright yellow wood-sorrel (Oxalis stricta)
Distribution: Distributed on both sides of the Cascades in Washington, more common west of the Cascades; widely distributed throughout North America.
Habitat: Disturbed ground, lawns and gardens.
Origin: Introduced
Flowers: April-September
Western yellow wood-sorrel (Oxalis suksdorfii)
Distribution: West of the Casccades in Washington; southern Washington to northwest California.
Habitat: Low elevations, usually in moist, coastal woods but sometimes on rather dry, open slopes.
Origin: Native
Flowers: April-August
Woodbine (Lonicera periclymenum)
Origin: Introduced
Woodland-beardtongue (Nothochelone nemorosa)
Distribution: Both sides of the Cascades, British Columbia to California
Habitat: Fairly dense woods to moist, open slopes at mid-elevations in the mountains
Origin: Native
Flowers: July - August
Bulbous woodlandstar (Lithophragma glabrum)
Distribution: East of the Cascades in Washington; British Columbia to California, east to the Dakotas and Colorado.
Habitat: Grasslands and sagebrush desert to ponderosa pine and Douglas fir forests.
Origin: Native
Flowers: March-May
Slender woodlandstar (Lithophragma tenellum)
Distribution: East side of the Cascades in Washington; British Columbia south to California, east to the Rocky Mountain states.
Habitat: Sagebrush desert and ponderosa pine forests.
Origin: Native
Flowers: May-June
Cascades woodrush (Luzula cascadensis)
Origin: Native
Common woodrush (Luzula multiflora)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to Oregon, east to Alberta and western Montana; also in northeastern United States.
Habitat: Fields, meadows, open woods and clearings, at low to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
Curved woodrush (Luzula arcuata)
Distribution: Alaska, British Columbia, and Mt. Rainier, Washington.
Habitat: Rocky or gravelly soil, usually on moraines or above timberline.
Origin: Native
Flowers: July - August
Field woodrush (Luzula campestris)
Origin: Introduced
Great woodrush (Luzula sylvatica)
Origin: Introduced
Hitchcock's woodrush (Luzula hitchcockii)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia south to Crater Lake and the Wallowa Mountains of Oregon, east to Alberta, Idaho and Montana.
Habitat: Montane forests to alpine slopes, ridges and meadows.
Origin: Native
Flowers: July-September
Large-anthered woodrush (Luzula macrantha)
Origin: Native
Piper's woodrush (Luzula piperi)
Origin: Native
Prairie woodrush (Luzula macrantha)
Origin: Native
Small flowered woodrush (Luzula parviflora)
Distribution: Alaska to Newfoundland, south to southern California and New York.
Habitat: Moist to fairly dry areas, coastal rain forest to alpine slopes.
Origin: Native
Flowers: May - August
Smooth woodrush (Luzula hitchcockii)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia south to Crater Lake and the Wallowa Mountains of Oregon, east to Alberta, Idaho and Montana.
Habitat: Montane forests to alpine slopes, ridges and meadows.
Origin: Native
Flowers: July-September
Snowy woodrush (Luzula nivea)
Origin: Introduced from Europe
Southern woodrush (Luzula forsteri)
Origin: Introduced
Spiked woodrush (Luzula spicata)
Origin: Native
Oregon woodsia (Woodsia oregana)
Distribution: Alaska to California, chiefly east of the Cascade summits in Washington and Oregon
Habitat: Rock crevices, ledges and talus slopes in the mountains, and in less arid parts of the lowlands.
Origin: Native
Woodsia (Woodsia scopulina)
Distribution: Alaska to California, chiefly east of the Cascade summits in Washington and Oregon
Habitat: Rock crevices, ledges and talus slopes in the mountains, and in less arid parts of the lowlands.
Origin: Native
Common woolly sunflower (Eriophyllum lanatum)
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
Dwarf woolly-marbles (Psilocarphus brevissimus)
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
Oregon woollyheads (Psilocarphus oregonus)
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
Slender woollyheads (Psilocarphus tenellus)
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
Tall woollyheads (Psilocarphus elatior)
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
Wilcox's woolstar (Eriastrum wilcoxii)
Origin: Native
Flowers: May - August
Wormseed (Dysphania ambrosioides)
Distribution: Occurring in scattered locations in Washington; native to southeastern U.S., but introduced in scattered localities in central and western U.S.
Habitat: Roadsides and waste areas, riparian zones, tolerant of alkaline.
Origin: Introduced from southern North America and tropical America
Flowers: July-November
Annual wormwood (Artemisia annua)
Distribution: Native of Eurasia, naturalized in eastern United States, rare in the Pacific Northwest.
Habitat: Fields and waste places.
Origin: Introduced
Flowers: August - October
Beach wormwood (Artemisia stelleriana)
Distribution: Known from a few locations along the north coast in Washington; known only from Washington in western North America; central Canada and U.S. to the Atlantic Coast.
Habitat: Coastal dunes and beaches.
Origin: Introduced
Flowers: May-September
Biennial wormwood (Artemisia biennis)
Distribution: Native in the Pacific Northwest, but widely distributed elsewhere as a weed.
Habitat: Waste places and streambanks, especially in sandy soil.
Origin: Native? Disputed native (BC) or introduced (Chambers and Sundberg 2000)
Flowers: August - October
Boreal wormwood (Artemisia norvegica)
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
Cascade wormwood (Artemisia tilesii)
Distribution: Occurring in the Olympic and Cascade Mountains of Washington; Alaska to Oregon, east to Montana and across Canada.
Habitat: Open rocky or gravelly, wet or dry sites, mostly at high elevations in the mountains, descending to sea level northward.
Origin: Native
Flowers: July-September
Coastal wormwood (Artemisia suksdorfii)
Distribution: Occurring west of the Cascades crest in Washington, British Columbia south to California.
Habitat: Bluffs and rocky or sandy beaches, less commonly in other low, open places.
Origin: Native
Flowers: June-August
Douglas wormwood (Artemisia douglasiana)
Distribution: Occurring in Washington chiefly east of the Cascades crest, but also on the west side; widely distributed throughout much of North America.
Habitat: Mostly along stream banks and river bottoms.
Origin: Native
Flowers: August-September
Dragon wormwood (Artemisia dracunculus)
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout the central and western portions of North America.
Habitat: Shrub-steppe to dry, open areas at mid-elevations.
Origin: Native
Flowers: July-October
Forked wormwood (Artemisia furcata)
Distribution: Occurring in the Cascades and Olympic Mountains of Washington; Alaska south to Washington, east to Northwest Territories, Alberta, and Nunavut.
Habitat: Open, rocky ledges and talus slopes at high elevations in the mountains.
Origin: Native
Flowers: July-September
Lobed wormwood (Artemisia vulgaris)
Distribution: Introduced from Europe, now established in most of eastern United States and adjacent Canada; uncommon in the Pacific Northwest.
Habitat: Waste areas and disturbed soil.
Origin: Introduced
Flowers: August - October
Michaux's wormwood (Artemisia michauxiana)
Distribution: British Columbia to California, east to Alberta and Wyoming.
Habitat: Rocky places in the mountains at rather high elevations.
Origin: Native
Flowers: May - August
Northern wormwood (Artemisia campestris)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of Washington.
Habitat: Open places, often in sandy soil.
Origin: Native
Flowers: July-September
Steller's wormwood (Artemisia stelleriana)
Distribution: Known from a few locations along the north coast in Washington; known only from Washington in western North America; central Canada and U.S. to the Atlantic Coast.
Habitat: Coastal dunes and beaches.
Origin: Introduced
Flowers: May-September
Three-forked wormwood (Artemisia furcata)
Distribution: Occurring in the Cascades and Olympic Mountains of Washington; Alaska south to Washington, east to Northwest Territories, Alberta, and Nunavut.
Habitat: Open, rocky ledges and talus slopes at high elevations in the mountains.
Origin: Native
Flowers: July-September
Wormwood (Artemisia absinthium)
Distribution: Introduced in the northern half of the United States and southern Canada
Habitat: Weed of roadsides and waste places
Origin: Introduced
Flowers: July - September
Square-stalked St. John's Wort (Hypericum tetrapterum)
Distribution: Introduced occasionally in western Washington.
Habitat: Damp wasteland.
Origin: Introduced
Flowers: July - September
Swallow wort (Chelidonium majus)
Distribution: Weedy introduction across southern Canada and the northern tier of states in the United States.
Habitat: Moist to dry woods, roadsides, fields, waste areas.
Origin: Introduced from Eurasia
Flowers: May - July
Narrowleaf wyethia (Wyethia angustifolia)
Distribution: Occurring in southwestern Washington and in the Columbia River Gorge in Washington; Washington south to California.
Habitat: Meadows and moist, open hillsides at low elevations.
Origin: Native
Flowers: May-July