Vascular Plants

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

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Common names beginning with S:
725 common names
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Index to common names:
s, sage, sagebrush, sagewort, sago-pondweed, saintfoin, saitas, salal, salmonberry, salsify, salt and pepper, saltbush, saltlover, saltwort, sandbur, sandcarpet, sandfain, sandgrass, sandmat, sandreed, sandspurry, sandverbena, sandweed, sandwort, sanicle, sarsaparilla, saskatoon, sawwort, saxifrage, scalepod, scheuchzeria, scorpion-grass, scorpion-weed, scorpiongrass, scorzonella, scouring-rush, scrambled eggs, scratchgrass, scurf-pea, scurfpea, scurvy-grass, scurvygrass, sea-blush, sea-milkwort, sea-pink, sea-rocket, sea-watch, seablite, seawrack, sedge, seepweed, sego lily, sego-lily, self-heal, senna, serpent-grass, serpentweed, service-tree, serviceberry, shadscale, sheep's bit, sheepburr, shepherd's-purse, shooting star, shotweed, sibbaldia, sicklegrass, sidalcea, sidebells, silene, silky-bent, silver-berry, silverback, silvercrown, silvergrass, silverpuffs, silverweed, single-delight, skeletonplant, skeletonweed, skullcap, skullcapp, skunkweed, skyrocket, sleepydick, slipper, smartweed, smelowskia, smoke, smooth medic, smotherweed, snakeroot, snakeweed, snapdragon, sneezeweed, snout, snow queen, snow-in-summer, snowberry, snowdrop, soapberry, soapwort, softgrass, soliva, Solomon's-seal, soopolallie, sorghum, sorrel, sow-thistle, sowbane, Spanish-broom, spatterdock, spearmint, spearwort, speedwell, spiderflower, spike-rush, spikemoss, spikenard, spikerush, spikeweed, spinach, spineflower, spiraea, spleenwort, spoonwort, sprangletop, spring, spring parsley, spring-gold, springbeauty, spruce, spurge, spurge-laurel, spurry, square, squashberry, squirreltail, St. John's-wort, St. Johns-wort, staggerweed, stalk, star, star-of-bethleham, star-thistle, star-tulip, starflower, stargrass, starthistle, starwort, steeplebush, steer's-head, stephanomeria, stichwort, stickseed, sticktight, sticky-laurel, sticky-starwort, sticky-willy, stinkgrass, stinkweed, stinky-Bob, stitchwort, stonecrop, stoneseed, stork's bill, stork's-bill, stranvaesia, strawberry, strawberry tree, strawberry-tomato, streptanthella, succory, sugarbowls, sugarstick, sulfurflower, sumac, sun cup, suncup, sundew, sunflower, sunshine, surf-grass, swainsonpea, swampcandles, sweet-after-death, sweet-cicely, sweet-clover, sweet-vetch, sweetbrier, sweetflag, sweetgale, sweetgrass, swertia, swinecress, sword-fern, sycamore
Hoary stock (Matthiola incana)
Distribution: Occurring in scattered locations west of the Cascades crest in lowland western Washington; also known from California and Texas.
Habitat: Roadsides, sandy cliffs, beaches, wastelots, and other disturbed, open areas where escaped from cultivation.
Origin: Introduced from Europe
Flowers: June-July
African sage (Salvia aethiopis)
Distribution: Introduced from the Mediterranean region to southwest United States, spreading north to eastern Oregon.
Habitat: A weed of dry waste places and roadsides.
Origin: Introduced from Europe
Flowers: June - July
Gray ball sage (Salvia dorrii)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Utah and Arizona.
Habitat: Dry, open, often sandy or rocky areas in sagebrush plains and foothills.
Origin: Native
Flowers: May-July
Prairie sage (Artemisia ludoviciana)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Meadows and open slopes, from the lowlands to the alpine.
Origin: Native
Flowers: June-October
Prairie-meadow sage (Salvia pratensis)
Distribution: Scattered locations on both sides of the Cascades in Washington; escaping in parts of western, central, and eastern North America.
Habitat: Roadsides and other disturbed habitats.
Origin: Introduced
Flowers: June-August
Purple sage (Salvia dorrii)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Utah and Arizona.
Habitat: Dry, open, often sandy or rocky areas in sagebrush plains and foothills.
Origin: Native
Flowers: May-July
Wand sage (Salvia virgata)
Origin: Introduced from Europe
Big sagebrush (Artemisia tridentata)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Dry plains and foothills to the subalpine, but not in lithosol or alkaline soil.
Origin: Native
Flowers: July-September
Cut-leaf sagebrush (Artemisia tripartita)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon and Nevada, east to Idaho and Wyoming.
Habitat: Sagebrush desert and grasslands.
Origin: Native
Flowers: July-September
Dwarf sagebrush (Artemisia arbuscula)
Distribution: Occurring east of the Cascades crest in Washington; central Washington to California, east to the Rocky Mountains.
Habitat: Open, dry plains and hills in sagebrush desert.
Origin: Native
Flowers: July-September
Hoary sagebrush (Artemisia cana)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Meadows and forest openings from low to middle elevations in the mountains.
Origin: Native
Flowers: July-September
Low sagebrush (Artemisia arbuscula)
Distribution: Occurring east of the Cascades crest in Washington; central Washington to California, east to the Rocky Mountains.
Habitat: Open, dry plains and hills in sagebrush desert.
Origin: Native
Flowers: July-September
Prairie sagebrush (Artemisia frigida)
Distribution: Occurring east of the Cascades crest in Washington; Alaska to Washington, east to the Great Plains, Great Lakes region, and northeastern North America.
Habitat: Dry, open sagebrush plains and foothills.
Origin: Native
Flowers: July-September
Scabland sagebrush (Artemisia rigida)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho and Montana.
Habitat: Dry, rocky places from the plains and foothills to moderate elevations in the mountains.
Origin: Native
Flowers: September-October
Silver sagebrush (Artemisia cana)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Meadows and forest openings from low to middle elevations in the mountains.
Origin: Native
Flowers: July-September
Snowfield sagebrush (Artemisia spiciformis)
Distribution: Occurring east of the Cascades crest in Washington; central Washington to California, east to southwestern Montana, Wyoming, and Colorado.
Habitat: Cool, moist slopes, from middle elevations to subalpine.
Origin: Native
Flowers: July-September
Spiked sagebrush (Artemisia spiciformis)
Distribution: Occurring east of the Cascades crest in Washington; central Washington to California, east to southwestern Montana, Wyoming, and Colorado.
Habitat: Cool, moist slopes, from middle elevations to subalpine.
Origin: Native
Flowers: July-September
Stiff sagebrush (Artemisia rigida)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho and Montana.
Habitat: Dry, rocky places from the plains and foothills to moderate elevations in the mountains.
Origin: Native
Flowers: September-October
Threetip sagebrush (Artemisia tripartita)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon and Nevada, east to Idaho and Wyoming.
Habitat: Sagebrush desert and grasslands.
Origin: Native
Flowers: July-September
Douglas's sagewort (Artemisia douglasiana)
Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, east to Nevada.
Habitat: Mostly along stream banks and river bottoms.
Origin: Native
Flowers: July-September
Dragon sagewort (Artemisia dracunculus)
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Great Plains and Great Lakes region.
Habitat: Sagebrush desert to ponderosa pine forest openings at middle elevations.
Origin: Native
Flowers: July-October
Lemon sagewort (Artemisia michauxiana)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta and Wyoming.
Habitat: Rocky places in the mountains at rather high elevations.
Origin: Native
Flowers: May-August
Mountain sagewort (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
Pacific sagewort (Artemisia campestris)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast; also in Eurasia.
Habitat: Open places, often in sandy or rocky soil, from low elevations to alpine.
Origin: Native
Flowers: July-September
Prairie sagewort (Artemisia frigida)
Distribution: Occurring east of the Cascades crest in Washington; Alaska to Washington, east to the Great Plains, Great Lakes region, and northeastern North America.
Habitat: Dry, open sagebrush plains and foothills.
Origin: Native
Flowers: July-September
Suksdorf's sagewort (Artemisia suksdorfii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California.
Habitat: Bluffs, beaches, rocky areas, and riverbanks, especially near the coast.
Origin: Native
Flowers: June-August
Sweet sagewort (Artemisia annua)
Distribution: Occurring in scattered locations east of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed open places.
Origin: Introduced from Eurasia
Flowers: August-October
Sago-pondweed (Stuckenia pectinata)
Distribution: Both sides of the Cascades in Washington; common throughout North America; Eurasia
Habitat: Shallow, fresh to brackish water.
Origin: Native
Flowers: July-September
Saintfoin (Onobrychis viciifolia)
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Great Plains, also in eastern North America,
Habitat: Roadsides, fields, wastelots, and other disturbed areas.
Origin: Introduced
Flowers: June-August
Northern saitas (Dichelostemma congestum)
Distribution: Scattered locations in Washington from the east side of the Olympic Peninsula and Island County to the Columbia River; Washington south to California.
Habitat: Grassy meadows, rocky prairies and sagebrush slopes.
Origin: Native
Flowers: May-June
Salal (Gaultheria shallon)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California.
Habitat: Forest understory and edge marine headlands, from sea level to moderate elevation in the mountains.
Origin: Native
Flowers: May-July
Salmonberry (Rubus spectabilis)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, disjunct in northern Idaho.
Habitat: Lowland moist woods and swamps to mid-elevations in the mountains.
Origin: Native
Flowers: March-June
Meadow salsify (Tragopogon pratensis)
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Roadsides, fields and waste places, usually in slightly moist areas.
Origin: Introduced
Flowers: May-August
Purple salsify (Tragopogon porrifolius)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Roadsides, fields and waste places, usually where moist.
Origin: Introduced from Europe
Flowers: April-August
Yellow salsify (Tragopogon dubius)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, wastelots, overgrazed areas, and other disturbed open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: May-September
Salt and pepper (Lomatium gormanii)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho.
Habitat: Open slopes and scablands in the foothills, valleys and plains, often with sagebrush.
Origin: Native
Flowers: February-May
Australian saltbush (Atriplex semibaccata)
Distribution: Occasionally introduced in eastern and central WA; scattered localities primarily in southwestern US.
Habitat: Disturbed areas from dry to moist, tolerant of alkaline soils.
Origin: Introduced from Australia
Flowers: April-September
Baltic saltbush (Atriplex longipes)
Origin: Introduced
Berry saltbush (Atriplex semibaccata)
Distribution: Occasionally introduced in eastern and central WA; scattered localities primarily in southwestern US.
Habitat: Disturbed areas from dry to moist, tolerant of alkaline soils.
Origin: Introduced from Australia
Flowers: April-September
Creeping saltbush (Atriplex semibaccata)
Distribution: Occasionally introduced in eastern and central WA; scattered localities primarily in southwestern US.
Habitat: Disturbed areas from dry to moist, tolerant of alkaline soils.
Origin: Introduced from Australia
Flowers: April-September
Fourwing saltbush (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
Gardner's saltbush (Atriplex gardneri)
Distribution: Occurring at low elevations in central Washington; Alberta south to California, east to the Great Plains.
Habitat: Sagebrush-steppe desert.
Origin: Native
Flowers: July-September
Hoary saltbush (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
Saline saltbush (Atriplex dioica)
Distribution: Occurring on both sides of the Cascades crest in Washington, but particularly common along the inner and outer marine coast; Yukon Territory to California, east to the Atlantic Coast.
Habitat: Salt marshes, sea beaches and headlands, also inland on disturbed or saline ground;
Origin: Native
Flowers: June-September
Saltlover (Halogeton glomeratus)
Origin: Introduced from Eurasia
Flowers: July - September
Low saltwort (Salicornia depressa)
Distribution: Strictly coastal in Washington;
Habitat: Salt marshes.
Origin: Native
Flowers: July-September
Red glasswort saltwort (Salicornia rubra)
Origin: Native
Flowers: July - September
Saltwort (Salicornia rubra)
Origin: Native
Flowers: July - September
Longspine sandbur (Cenchrus longispinus)
Distribution: Eastern Washington, south to Mexico, east to much of the United States.
Habitat: Sandy river banks.
Origin: Introduced
Flowers: July - September
Mat sandbur (Cenchrus longispinus)
Distribution: Eastern Washington, south to Mexico, east to much of the United States.
Habitat: Sandy river banks.
Origin: Introduced
Flowers: July - September
Sandcarpet (Cardionema ramosissima)
Distribution: Along the coast in Washington; south to Mexico.
Habitat: Sandy beaches along the coast.
Origin: Native
Flowers: June-August
Sandfain (Onobrychis viciifolia)
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Great Plains, also in eastern North America,
Habitat: Roadsides, fields, wastelots, and other disturbed areas.
Origin: Introduced
Flowers: June-August
Purple sandgrass (Triplasis purpurea)
Origin: Introduced
Rib seed sandmat (Euphorbia glyptosperma)
Distribution: Chiefly east of the Cascades in Washington; British Columbia south to California, east to Maine and Texas.
Habitat: Dry, sandy soil, from the plains to the lower mountains.
Origin: Native
Flowers: June-September
Sandmat (Cardionema ramosissima)
Distribution: Along the coast in Washington; south to Mexico.
Habitat: Sandy beaches along the coast.
Origin: Native
Flowers: June-August
Sandmat (Euphorbia maculata)
Distribution: Occurring on both sides of the Cascades in Washington; widely distributed throughout much of North America.
Habitat: Disturbed soil and waste areas.
Origin: Introduced from eastern North America
Flowers: June-September
Prairie sandreed (Calamovilfa longifolia)
Origin: Introduced
Alkali sandspurry (Spergularia diandra)
Origin: Introduced from Europe
Flowers: April - July
Beach sandspurry (Spergularia macrotheca)
Distribution: Along the coast in Washington; British Columbia south to Baja California.
Habitat: Along the sea shore, often in salt marshes and rock crevices in the splash zone.
Origin: Native
Flowers: June-September
Bocconi's sandspurry (Spergularia bocconei)
Origin: Introduced
Canada sandspurry (Spergularia canadensis)
Distribution: Along the coast in Washington; Alaska south to California.
Habitat: Coastal tidelands and mudflats.
Origin: Native
Flowers: June-August
Red sandspurry (Spergularia rubra)
Distribution: Occurring throughout Washington; introduced from Europe and common throughout North America.
Habitat: Weed of gardens, waste places, disturbed grasslands and forest openings.
Origin: Introduced from Europe
Flowers: April-October
Saltmarsh sandspurry (Spergularia salina)
Distribution: Both coastal and inland populations in Washington; Native and introduced throughout North America.
Habitat: Saline or brackish areas along the coast, and alkaline areas inland.
Origin: Introduced
Flowers: May-August
Honey-scented sandverbena (Abronia mellifera)
Distribution: Distributed east of the Cascades in Washington in the Columbia Basin and along the Snake River; north-central Oregon, southeastern Oregon and adjacent Idaho, southeastern Idaho and adjacent Wyoming.
Habitat: Dunes and sandy soil at low elevations.
Origin: Native
Flowers: May-July
Pink sandverbena (Abronia umbellata)
Distribution: Occurring west of the Cascades crest along the outer coast in Washington; British Columbia to Baja California.
Habitat: Coastal sandy beaches and adjacent dunes.
Origin: Native
Flowers: May-September
Sandweed (Athysanus pusillus)
Distribution: Both sides of the Cascades in Washington; British Columbia south to California, east to Idaho.
Habitat: Dry, open, often grassy places.
Origin: Native
Flowers: March-June
Alpine sandwort (Cherleria obtusiloba)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to central Oregon, east to the Rocky Mountains as far south as New Mexico.
Habitat: Dry, subalpine to alpine slopes and tundra.
Origin: Native
Flowers: June-August
Annual sandwort (Sabulina pusilla)
Distribution: Occurring east of the Cascades crest from Klickitat County to the southeastern counties in Washington; southern Washington to California, east to northeastern Oregon and adjacent Idaho.
Habitat: Dry, rocky cliffs and outcroppings in sagebrush desert to ponderosa pine forest openings.
Origin: Native
Flowers: May-July
Ballhead sandwort (Eremogone congesta)
Distribution: Okanogan County, Washington, south on the east side of the Cascades to Oregon and the Sierra Nevada of California, east to the Rockies.
Habitat: Sagebrush desert to alpine slopes.
Origin: Native
Flowers: June - August
Basalt sandwort (Sabulina basaltica)
Distribution: Known only from the northeastern Olympic Mountains in Washington.
Habitat: Rocky outcroppings and exposed areas in the subalpine and alpine.
Origin: Native
Flowers: June-August
Blunt-leaf sandwort (Moehringia lateriflora)
Distribution: Occurring on both sides of the Cascades in Washington, though more common east of the crest; occurring throughout much of North America except along the southern U.S. boundary.
Habitat: Forest understory and edge, open meadows.
Origin: Native
Flowers: May-August
Bluntleaf sandwort (Moehringia lateriflora)
Distribution: Occurring on both sides of the Cascades in Washington, though more common east of the crest; occurring throughout much of North America except along the southern U.S. boundary.
Habitat: Forest understory and edge, open meadows.
Origin: Native
Flowers: May-August
Capitate sandwort (Eremogone congesta)
Distribution: Okanogan County, Washington, south on the east side of the Cascades to Oregon and the Sierra Nevada of California, east to the Rockies.
Habitat: Sagebrush desert to alpine slopes.
Origin: Native
Flowers: June - August
Dwarf sandwort (Sabulina pusilla)
Distribution: Occurring east of the Cascades crest from Klickitat County to the southeastern counties in Washington; southern Washington to California, east to northeastern Oregon and adjacent Idaho.
Habitat: Dry, rocky cliffs and outcroppings in sagebrush desert to ponderosa pine forest openings.
Origin: Native
Flowers: May-July
Franklin's sandwort (Eremogone franklinii)
Distribution: Occurring east of the Cascades crest in central Washington; Washington to Oregon, east to Idaho and Nevada.
Habitat: Sand dunes, scabland, and sagebrush slopes.
Origin: Native
Flowers: May-June
Large-leaf sandwort (Moehringia macrophylla)
Distribution: Both sides of the Cascades, east to the Atlantic Coast
Habitat: Moist to dry, shaded to open woods, meadows and rocky slopes in the mountains
Origin: Native
Flowers: May - August
Marsh sandwort (Arenaria paludicola)
Distribution: Presumed extirpated from Washington; historically west of the Cascades crest along the coast. California to Central America.
Habitat: Swampy places, mostly along coast.
Origin: Native
Flowers: May-August
Mountain sandwort (Eremogone capillaris)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to northern Oregon and northern Nevada, east to Alberta and Montana.
Habitat: Sagebrush plains to rocky subalpine slopes.
Origin: Native
Flowers: June-August
Needle-leaf sandwort (Eremogone aculeata)
Distribution: Southeast Washington and northeast Oregon east to Beaverhead County, Montana, south to Nevada, Utah, and northeast California.
Habitat: Gravelly sagebrush-covered hills at 6000 feet elevation to rocky alpine slopes.
Origin: Native
Flowers: June-August
Nuttall's sandwort (Sabulina nuttallii)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Sagebrush hills to alpine slopes, especially on gravelly benches or talus.
Origin: Native
Flowers: May-August
Olympic sandwort (Sabulina basaltica)
Distribution: Known only from the northeastern Olympic Mountains in Washington.
Habitat: Rocky outcroppings and exposed areas in the subalpine and alpine.
Origin: Native
Flowers: June-August
Prickly sandwort (Eremogone aculeata)
Distribution: Southeast Washington and northeast Oregon east to Beaverhead County, Montana, south to Nevada, Utah, and northeast California.
Habitat: Gravelly sagebrush-covered hills at 6000 feet elevation to rocky alpine slopes.
Origin: Native
Flowers: June-August
Seabeach sandwort (Honckenya peploides)
Distribution: Occuring west of the Cascades crest in the coastal counties in Washington; Alaska to northern Oregon, east across Canada to coastal northeastern North America; Greenland and arctic Eurasia.
Habitat: Coastal beaches, strands, and sand dunes.
Origin: Native
Flowers: May-September
Slender sandwort (Sabulina macra)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to Oregon.
Habitat: Lowlands, prairies and coastal bluffs.
Origin: Native
Flowers: April-July
Thread-leaved sandwort (Eremogone capillaris)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to northern Oregon and northern Nevada, east to Alberta and Montana.
Habitat: Sagebrush plains to rocky subalpine slopes.
Origin: Native
Flowers: June-August
Thyme-leaf sandwort (Arenaria serpyllifolia)
Distribution: Widely distributed across Washington; introduced in most of North America.
Habitat: Weed in various habitats.
Origin: Introduced from Europe
Flowers: May-July
Twin Sisters sandwort (Sabulina sororia)
Distribution: Endemic to the Twin Sisters Range in Whatcom County.
Habitat: Rocky outcroppings and exposed areas.
Origin: Native
Flowers: June-August
Two-flowered sandwort (Cherleria biflora)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, and in Rocky Mountains to Colorado and Arizona; circumboreal
Habitat: Moist subalpine to alpine slopes, often near snowbanks.
Origin: Native
Flowers: June-August
Bear's-foot sanicle (Sanicula arctopoides)
Distribution: Occurring west of the Cascades crest along the coast in Washington; Vancouver Island, B.C. south along the coast to California.
Habitat: Maritime species of coastal bluffs, meadows, and balds.
Origin: Native
Flowers: March-May
Pacific sanicle (Sanicula crassicaulis)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California.
Habitat: Meadows, balds, prairies, and open woods from the coast to low elevations in the mountains.
Origin: Native
Flowers: April-June
Purple sanicle (Sanicula bipinnatifida)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California.
Habitat: Balds, forest edge, and other open to partially shaded areas at low to moderate elevations.
Origin: Native
Flowers: May-June
Wild sarsaparilla (Aralia nudicaulis)
Distribution: Occurring in northeastern region of Washington; Eastern British Columbia, east to the Atlantic Coast, and south in the mountains to Colorado.
Habitat: Moist, shaded soil.
Origin: Native
Flowers: May-June
Saskatoon (Amelanchier alnifolia)
Distribution: Occurring throughout both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and Great Plains.
Habitat: Open woods, canyons and hillsides, sea level to subalpine.
Origin: Native
Flowers: April-July
American sawwort (Saussurea americana)
Distribution: Occurring in the Olympic and Cascade Mountains of Washington; Yukon Territory south to California, east to Alberta, Montana, and Idaho.
Habitat: Meadows and open, often rocky slopes, where moist, at mid- to high elevations in the mountains.
Origin: Native
Flowers: July-September
Alpine saxifrage (Micranthes tolmiei)
Distribution: Occurring in the Olympic and Cascade mountains in Washington; Alaska south to California, east to Idaho, Montana, Nevada and Utah.
Habitat: Mountain meadows, scree, and rock crevices at moderate to high elevations.
Origin: Native
Flowers: June-September
Bog saxifrage (Micranthes oregana)
Distribution: Both sides of the Cascades crest in Washington; Washington south to California, east to Alberta, Montana, Idaho, Nevada, and Colorado.
Habitat: Bogs, streambanks and wet meadows at mid-elevations in the mountains.
Origin: Native
Flowers: April-July
Brook saxifrage (Micranthes odontoloma)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Streambanks, lake shores and wet meadows from low elevations in the mountains to the alpine.
Origin: Native
Flowers: June-September
Clayton's saxifrage (Micranthes fragosa)
Distribution: East of Cascades in Washington, south to Oregon and east to Idaho.
Habitat: Wet slopes and cliffs, often near watercourses.
Origin: Native
Flowers: April-June
Columbia saxifrage (Micranthes nidifica)
Distribution: East of the crest of the Cascades, British Columbia south to northeast California, east to Idaho and Nevada.
Habitat: Prairies and wet banks to subalpine meadows.
Origin: Native
Flowers: April - July
Columbian saxifrage (Micranthes integrifolia)
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia south to California.
Habitat: Prairies, grassy slopes and vernally moist areas, sea level to subalpine.
Origin: Native
Flowers: March-July
Dotted saxifrage (Micranthes nelsoniana)
Distribution: Both sides of the Cascades in Washington; British Columbia to Oregon.
Habitat: Montane wet areas and streambanks from low to medium elevations.
Origin: Native
Flowers: May-July
Gorman's saxifrage (Micranthes gormanii)
Origin: Native
Idaho saxifrage (Micranthes idahoensis)
Distribution: Washington and Oregon, east to Montana and Idaho.
Habitat: Exposed areas, ledges, and open slopes.
Origin: Native
Flowers: April-July
Leatherleaf saxifrage (Leptarrhena pyrolifolia)
Distribution: Occurring on both sides of the Cascades crest in Washington, including the Olympic Mountains; Alaska to Oregon, east to Northwest Territory, Alberta, and Montana.
Habitat: Streambanks, seeps and wet meadows, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Lyall's saxifrage (Micranthes lyallii)
Distribution: Occurring on both sides of the Cascades crest in northern Washington; Alaska to Washington, east to Alberta, Idaho, and Montana.
Habitat: Wet, gravelly meadows and along streams and ponds at high elevations.
Origin: Native
Flowers: July-September
Matted saxifrage (Saxifraga austromontana)
Distribution: Alaska to Greenland, south in the Cascades to Oregon, and in the Rockies to New Mexico
Habitat: Cliff crevices, talus and scree slopes, mid- to high elevations in the mountains
Origin: Native
Flowers: June-August
Matted saxifrage (Saxifraga vespertina)
Distribution: West of the Cascades crest in Washington; Washington south to Oregon.
Habitat: Rocky outcroppings.
Origin: Native
Flowers: June-August
Merten's saxifrage (Saxifraga mertensiana)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Idaho, and Montana.
Habitat: Wet ledges, shaded seeps on rock faces, and gravelly stream banks from sea level to the subalpine.
Origin: Native
Flowers: April-August
Mountain saxifrage (Micranthes occidentalis)
Distribution: Both sides of the Cascades in Washington; Alaska south to Oregon and Nevada, east to Saskatachewan and south to New Mexico.
Habitat: Dry to wet open areas, rock crevices, meadows, and streambanks from moderate to high elevations in the mountains.
Origin: Native
Flowers: May-August
Nelson's saxifrage (Micranthes nelsoniana)
Distribution: Both sides of the Cascades in Washington; British Columbia to Oregon.
Habitat: Montane wet areas and streambanks from low to medium elevations.
Origin: Native
Flowers: May-July
Nodding saxifrage (Saxifraga cernua)
Distribution: Known only east of the Cascades crest in north-central Washington; Alaska south to California, east to the Rocky Mountains and across northern Canada to the Atlantic Coast.
Habitat: Among rocks in alpine areas, often where moist.
Origin: Native
Flowers: July-September
Nuttall's saxifrage (Cascadia nuttallii)
Distribution: Occurring west of the Cascades crest on the Olympic Peninsula and south in Washington; Washington south along the coast to southwestern Oregon.
Habitat: Wet banks and near waterfalls, usually growing in moss, from low to middle elevations in the mountains.
Origin: Native
Flowers: March-July
Olympic saxifrage (Micranthes tischii)
Distribution: Olympic Peninsula endemic
Habitat: Forested ledges and rock crevices where moist.
Origin: Native
Flowers: May-July
Oregon saxifrage (Micranthes oregana)
Distribution: Both sides of the Cascades crest in Washington; Washington south to California, east to Alberta, Montana, Idaho, Nevada, and Colorado.
Habitat: Bogs, streambanks and wet meadows at mid-elevations in the mountains.
Origin: Native
Flowers: April-July
Purple saxifrage (Saxifraga oppositifolia)
Distribution: In the Olympic and Cascade mountains of Washington; Alaska south to Oregon, east to the Rocky Mountains; across northern Canada and northeastern U.S.
Habitat: Alpine slopes and rocky outcroppings
Origin: Native
Flowers: June-August
Pygmy saxifrage (Saxifraga hyperborea)
Distribution: In the Olympic and Cascade mountains of Washington; Alaska south to California, throughout the Rocky Mountains, across northern Canada to the Maritime Provinces.
Habitat: Alpine tundra, often where moist with rocky outcroppings, crevices, and snowmelt.
Origin: Native
Flowers: June-August
Red-stemmed saxifrage (Micranthes lyallii)
Distribution: Occurring on both sides of the Cascades crest in northern Washington; Alaska to Washington, east to Alberta, Idaho, and Montana.
Habitat: Wet, gravelly meadows and along streams and ponds at high elevations.
Origin: Native
Flowers: July-September
Redwool saxifrage (Micranthes occidentalis)
Distribution: Both sides of the Cascades in Washington; Alaska south to Oregon and Nevada, east to Saskatachewan and south to New Mexico.
Habitat: Dry to wet open areas, rock crevices, meadows, and streambanks from moderate to high elevations in the mountains.
Origin: Native
Flowers: May-August
Rue-leaved saxifrage (Saxifraga tridactylites)
Origin: Introduced
Rusty saxifrage (Micranthes ferruginea)
Distribution: Occurring in the Cascades and Olympic Mountains, and in the mountains of northeastern in Washington; Alaska to south California, east to Idaho, Montana, and Wyoming.
Habitat: Open, moist, often rocky areas, from low to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Rusty-hair saxifrage (Micranthes rufidula)
Distribution: Both sides of the Cascades in Washington; British Columbia south to California.
Habitat: Wet open areas, ledges, rock outcroppings from moderate to high elevations in the mountains.
Origin: Native
Flowers: May-August
Spotted saxifrage (Saxifraga austromontana)
Distribution: Alaska to Greenland, south in the Cascades to Oregon, and in the Rockies to New Mexico
Habitat: Cliff crevices, talus and scree slopes, mid- to high elevations in the mountains
Origin: Native
Flowers: June-August
Spotted saxifrage (Saxifraga vespertina)
Distribution: West of the Cascades crest in Washington; Washington south to Oregon.
Habitat: Rocky outcroppings.
Origin: Native
Flowers: June-August
Strawberry saxifrage (Saxifragopsis fragarioides)
Distribution: Occurring east of the Cascades crest in the Wenatchee Mountains in Washington, where disjunct; southwestern Oregon to adjacent California.
Habitat: Rock outcrops and talus slopes at middle elevations.
Origin: Native
Flowers: June-August
Streambank saxifrage (Micranthes odontoloma)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Streambanks, lake shores and wet meadows from low elevations in the mountains to the alpine.
Origin: Native
Flowers: June-September
Swamp saxifrage (Micranthes integrifolia)
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia south to California.
Habitat: Prairies, grassy slopes and vernally moist areas, sea level to subalpine.
Origin: Native
Flowers: March-July
Swamp saxifrage (Micranthes nidifica)
Distribution: East of the crest of the Cascades, British Columbia south to northeast California, east to Idaho and Nevada.
Habitat: Prairies and wet banks to subalpine meadows.
Origin: Native
Flowers: April - July
Tiny swamp saxifrage (Micranthes apetala)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho and Montana.
Habitat: Vernally moist meadows at low to middle elevations.
Origin: Native
Flowers: March-May
Tolmie's alpine saxifrage (Micranthes tolmiei)
Distribution: Occurring in the Olympic and Cascade mountains in Washington; Alaska south to California, east to Idaho, Montana, Nevada and Utah.
Habitat: Mountain meadows, scree, and rock crevices at moderate to high elevations.
Origin: Native
Flowers: June-September
Tolmie's saxifrage (Micranthes tolmiei)
Distribution: Occurring in the Olympic and Cascade mountains in Washington; Alaska south to California, east to Idaho, Montana, Nevada and Utah.
Habitat: Mountain meadows, scree, and rock crevices at moderate to high elevations.
Origin: Native
Flowers: June-September
Tufted alpine saxifrage (Saxifraga cespitosa)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to south California, east to the Rocky Mountains; east across Canada to the Atlantic Coast.
Habitat: Ledges, gravelly ridges and scree, near sea level to alpine.
Origin: Native
Flowers: April-September
Tufted saxifrage (Saxifraga cespitosa)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to south California, east to the Rocky Mountains; east across Canada to the Atlantic Coast.
Habitat: Ledges, gravelly ridges and scree, near sea level to alpine.
Origin: Native
Flowers: April-September
Twinflowered saxifrage (Saxifraga oppositifolia)
Distribution: In the Olympic and Cascade mountains of Washington; Alaska south to Oregon, east to the Rocky Mountains; across northern Canada and northeastern U.S.
Habitat: Alpine slopes and rocky outcroppings
Origin: Native
Flowers: June-August
Wedge-leaf saxifrage (Saxifraga adscendens)
Distribution: Occurring on both sides of the Cascades crest in northern Washington and possibly in the Olympic Mountains; Alaska to Nevada, east to the Rocky Mountains.
Habitat: Glacial moraines and alpine gravelly meadows.
Origin: Native
Flowers: June-August
Western saxifrage (Micranthes occidentalis)
Distribution: Both sides of the Cascades in Washington; Alaska south to Oregon and Nevada, east to Saskatachewan and south to New Mexico.
Habitat: Dry to wet open areas, rock crevices, meadows, and streambanks from moderate to high elevations in the mountains.
Origin: Native
Flowers: May-August
Western swamp saxifrage (Micranthes apetala)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho and Montana.
Habitat: Vernally moist meadows at low to middle elevations.
Origin: Native
Flowers: March-May
Whole-leaf saxifrage (Micranthes integrifolia)
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia south to California.
Habitat: Prairies, grassy slopes and vernally moist areas, sea level to subalpine.
Origin: Native
Flowers: March-July
Woodland saxifrage (Saxifraga mertensiana)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Idaho, and Montana.
Habitat: Wet ledges, shaded seeps on rock faces, and gravelly stream banks from sea level to the subalpine.
Origin: Native
Flowers: April-August
Scalepod (Idahoa scapigera)
Distribution: East of the Cascades in Washington; Washington sout to California, east to Idaho.
Habitat: Shrub-steppe, especially with sagebrush.
Origin: Native
Flowers: March-April
Scheuchzeria (Scheuchzeria palustris)
Distribution: Southern Alaska south to northern California, east to Labrador and New Jersey.
Habitat: In bogs or on lake margins.
Origin: Native
Flowers: May - July
Blue scorpion-grass (Myosotis micrantha)
Distribution: Introduced over most of northern United States and southern Canada; in Washington, chiefly east of the Cascades, where fairly common.
Habitat: Roadsides, stream banks, and moist to dry open places.
Origin: Introduced
Flowers: April - June
Bolander's scorpion-weed (Phacelia bolanderi)
Distribution: Occurring west of the Cascades crest in lowland southwestern Washington; Coos Bay, Oregon south along the coast to Sonoma County, California.
Habitat: Mostly on open, often unstable slopes at low elevations.
Origin: Native
Flowers: June-July
Dwarf scorpion-weed (Phacelia minutissima)
Distribution: Occurring east of the Cascades crest in Kittitas County in Washington; central Washington to northeastern Nevada, east to Idaho.
Habitat: Meadows and forest openings at middle elevations in the mountains.
Origin: Native
Flowers: June-July
Four-part yellow scorpion-weed (Phacelia tetramera)
Distribution: Occurring east of the Cascades crest in central Washington; central Washington to California, east to Idaho, Wyoming and Utah.
Habitat: Alkaline flats and washes at low to middle elevations.
Origin: Native
Flowers: May-June
Franklin's scorpion-weed (Phacelia franklinii)
Distribution: Occurring east of the Cascades crest in northeastern Washington; Yukon to northeastern Washington, east to western Montana and Wyoming, further east to the Great Lakes region.
Habitat: Talus and open areas at middle elevations in the mountains
Origin: Native
Flowers: June-July
Glandular-hair scorpion-weed (Phacelia glandulifera)
Distribution: Occurring east of the Cascades crest in central Washington; Washington to California, east to Idaho, Nevada, Utah, and Wyoming.
Habitat: Open areas in sagebrush desert.
Origin: Native
Flowers: June
Sticky scorpion-weed (Phacelia lenta)
Distribution: Occurring east of the Cascades crest in Washington, where endemic to Chelan and Douglas counties.
Habitat: Open rocky habitats, talus, rocky outcrops.
Origin: Native
Flowers: April-June
Tall scorpion-weed (Phacelia procera)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington to California, also in the Blue Mountains of northeast Oregon and east to adjacent west-central Idaho.
Habitat: Meadows, forest openings and edge, and lightly wooded slopes at middle elevations in the mountains.
Origin: Native
Flowers: June-August
Thread-leaf scorpion-weed (Phacelia linearis)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Common in dry, open places in the foothills and plains to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
Early scorpiongrass (Myosotis verna)
Origin: Native
Flowers: May - July
Field scorpiongrass (Myosotis arvensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to Oregon, east across the northern half of North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and forest openings, typically associated with disturbance.
Origin: Introduced from Europe
Flowers: May-July
Spring scorpiongrass (Myosotis verna)
Origin: Native
Flowers: May - July
White scorpiongrass (Myosotis verna)
Origin: Native
Flowers: May - July
Yellow and blue scorpiongrass (Myosotis discolor)
Distribution: Introduced in Washington to California, east to Montana, and along the East Coast
Habitat: Roadsides, dry to moist open areas
Origin: Introduced from Europe
Flowers: May - August
Yellow scorpiongrass (Myosotis discolor)
Distribution: Introduced in Washington to California, east to Montana, and along the East Coast
Habitat: Roadsides, dry to moist open areas
Origin: Introduced from Europe
Flowers: May - August
Nodding scorzonella (Microseris nutans)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Slopes, meadows, flats, and forest openings,often in somewhat moist places, from low to middle elevations.
Origin: Native
Flowers: April-July
Common scouring-rush (Equisetum hyemale)
Distribution: Circumboreal; throughout the Pacific Northwest
Habitat: Moist to wet areas, lowlands to moderate elevations in the mountains
Origin: Native
Northern scouring-rush (Equisetum variegatum)
Distribution: Alaska to Oregon, east across southern Canada and the northern third of the United States
Habitat: Wet places, sea level to alpine
Origin: Native
Scrambled eggs (Corydalis aurea)
Distribution: Occurring chiefly east of the Cascades in Washington; widely distributed throughout much of North America except southeastern U.S.
Habitat: In varied habitats, from moist to dry and well-drained soil.
Origin: Native
Flowers: May-August
Scratchgrass (Muhlenbergia asperifolia)
Distribution: British Columbia south, east of the Cascades, to California, east to Montana and Texas.
Habitat: Dry to moist alkaline places.
Origin: Native
Flowers: June - September
Lemon scurfpea (Ladeania lanceolata)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Great Plains.
Habitat: Sagebrush steppe habitat in dry areas, often where sandy.
Origin: Native
Flowers: May-June
Forest scurfpea (Rupertia physodes)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, disjunct in northeastern Oregon and adjacent Idaho.
Habitat: Prairie and forest edges at low elevations.
Origin: Native
Flowers: May-June
Lance-leaf scurfpea (Ladeania lanceolata)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Great Plains.
Habitat: Sagebrush steppe habitat in dry areas, often where sandy.
Origin: Native
Flowers: May-June
Scurvy-grass (Cochlearia groenlandica)
Origin: Native
Danish scurvygrass (Cochlearia groenlandica)
Origin: Native
Scurvygrass (Barbarea verna)
Origin: Introduced from Eurasia
Flowers: April - July
Scurvygrass (Cochlearia groenlandica)
Origin: Native
Sea-blush (Plectritis congesta)
Distribution: In Washington occurring west of the Cascades crest and in the Columbia River Gorge; Vancouver Island south to California.
Habitat: Open, vernally moist balds, prairies, meadows and slopes, from sea level to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Sea-milkwort (Lysimachia maritima)
Distribution: Chiefly west of the Cascades in Washington; circumboreal; Alaska to California, east to Newfoundland, south in eastern North America to Virginia.
Habitat: Coastal tideflats and saline areas.
Origin: Native
Flowers: April-June
Sea-pink (Armeria maritima)
Distribution: Occurring west of the Cascades crest in Washington, chiefly in the coastal counties; Alaska to California, east across Canada to northeastern North America; Greenland and Europe.
Habitat: Along beaches, coastal bluffs and balds, occasionally inland in prairies.
Origin: Native
Flowers: March-July
American sea-rocket (Cakile edentula)
Distribution: Occurring west of the Cascades crest in coastal counties in Washington; Alaska to California along the coast, native to the Great Lakes region and coastal eastern North America.
Habitat: Along marine water shorelines in sand or gravel.
Origin: Introduced from eastern North America
Flowers: May-October
European sea-rocket (Cakile maritima)
Distribution: Occurring west of the Cascades crest in coastal counties in Washington; British Columbia to California along the coast, also along the Chesapeake Bay on the Atlantic Coast.
Habitat: Along marine water shorelines in sand or gravel.
Origin: Introduced from Europe
Flowers: May-October
Sea-rocket (Cakile maritima)
Distribution: Occurring west of the Cascades crest in coastal counties in Washington; British Columbia to California along the coast, also along the Chesapeake Bay on the Atlantic Coast.
Habitat: Along marine water shorelines in sand or gravel.
Origin: Introduced from Europe
Flowers: May-October
Sea-watch (Angelica lucida)
Distribution: Occurring west of the Cascades crest in Washington in the coastal counties; Alaska to California, also in eastern North America; Far East Russia.
Habitat: Coastal bluffs, beaches, and estuaries.
Origin: Native
Flowers: July-September
Common seablite (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
Horned seablite (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
Slender seablite (Suaeda occidentalis)
Distribution: Eastern Washington to northern Nevada, east through southern Idaho to Colorado.
Habitat: Saline or alkaline flats and marshes in sagebrush area.
Origin: Native
Flowers: Late June - August
Seawrack (Zostera marina)
Distribution: Occurring in Washington\'s coastal counties; Alaska to California along the coast; also on the Atlantic Coast.
Habitat: Sub-tidal area.
Origin: Native
Flowers: June-August
Abrupt-beaked sedge (Carex abrupta)
Origin: Native
Alaska long-awn sedge (Carex macrochaeta)
Origin: Native
Flowers: June - August
Alpine nerve sedge (Carex neurophora)
Origin: Native
Flowers: July - August
Analogue sedge (Carex simulata)
Origin: Native
Flowers: May - August
Awned sedge (Carex atherodes)
Origin: Native
Flowers: June - August
Back's sedge (Carex backii)
Origin: Native
Beaked sedge (Carex utriculata)
Origin: Native
Bearded sedge (Carex comosa)
Distribution: Widespread in eastern United States, occasional in Washington, Idaho and Montana
Habitat: Marshes and wet meadows from the lowlands to moderate elevations in the mountains
Origin: Native
Flowers: May - July
Bebb's sedge (Carex bebbii)
Origin: Native
Flowers: May - August
Big inflated sedge (Carex exsiccata)
Origin: Native
Flowers: June - August
Big-leaf sedge (Carex amplifolia)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho and Montana, also in New Mexico.
Habitat: Swamps, bogs and other wet places, lowlands to moderate elevations in the mountains
Origin: Native
Flowers: May-July
Bighead sedge (Carex macrocephala)
Distribution: Occurring in counties along the Puget Sound and outer coast in Washington; Alaska south to Oregon; northern Pacific Rim.
Habitat: Sandy saltwater beaches and dunes.
Origin: Native
Flowers: June-July
Black alpine sedge (Carex nigricans)
Origin: Native
Flowers: June - August
Black bog sedge (Carex pluriflora)
Origin: Native
Flowers: June - July
Black-and-white-scaled sedge (Carex albonigra)
Distribution: Occurring in the Cascade and Olympic mountains of Washington; Alaska south to California, east to the Rocky Mountains.
Habitat: Alpine areas, high elevation talus and scree.
Origin: Native
Flowers: July-August
Black-scale sedge (Carex atrosquama)
Origin: Native
Flowers: July - August
Blunt sedge (Carex obtusata)
Origin: Native
Flowers: May - July
Bolander's sedge (Carex bolanderi)
Distribution: Occurring on both sides of the Cascades crest in Washington British Columbia to California, east to Rocky Mountains, also in Mexico.
Habitat: Springs, moist slopes, riparian forests, shores, upper margins of salt marshes, and ditches.
Origin: Native
Flowers: May-July
Boreal bog sedge (Carex magellanica)
Origin: Native
Brewer's sedge (Carex breweri)
Distribution: Occurring in the Cascades Mountains from Mt. Adams and south in Washington; south-central Washington to California and Nevada.
Habitat: Volcanic ash, pumice, scree, talus, rocky slopes in the subalpine and alpine.
Origin: Native
Flowers: July-August
Bristle-leaf sedge (Isolepis setacea)
Origin: Introduced
Bristle-leaved sedge (Carex eburnea)
Origin: Native
Bristly sedge (Carex comosa)
Distribution: Widespread in eastern United States, occasional in Washington, Idaho and Montana
Habitat: Marshes and wet meadows from the lowlands to moderate elevations in the mountains
Origin: Native
Flowers: May - July
Brown bog sedge (Carex buxbaumii)
Origin: Native
Flowers: June - August
Brown sedge (Carex brunnescens)
Distribution: Circumboreal at high latitudes, south through the Cascades to the Siskiyou Mountains of Oregon
Habitat: Wet places in the mountains
Origin: Native
Flowers: May - August
Buxbaum's sedge (Carex buxbaumii)
Origin: Native
Flowers: June - August
California sedge (Carex californica)
Origin: Native
Flowers: May - August
Capitate sedge (Carex capitata)
Distribution: Occurring in northwestern and north-central Washington near the Canadian border; Alaska south to California and Nevada (but not in Oregon), east to the Rocky Mountains in the U.S. and east across Canada to the Atlantic Coast; circumboreal.
Habitat: Alpine slopes.
Origin: Native
Flowers: July-August
Cloud sedge (Carex haydeniana)
Origin: Native
Flowers: June - August
Clustered field sedge (Carex praegracilis)
Origin: Native
Flowers: May - August
Coiled sedge (Carex circinata)
Origin: Native
Flowers: June - August
Columbia sedge (Carex aperta)
Origin: Native
Flowers: April - August
Common woolly sedge (Scirpus atrocinctus)
Distribution: Known only from Whatcom County in Washington; British Columbia south to Washington, east across the northern half of North America to the Atlantic Coast.
Habitat: Wet, low ground.
Origin: Native
Flowers: July-August
Constance's sedge (Carex davyi)
Origin: Native
Cordilleran sedge (Carex cordillerana)
Origin: Native
Cordroot sedge (Carex chordorrhiza)
Origin: Native
Crawe's sedge (Carex crawei)
Origin: Native
Flowers: May - July
Crawford's sedge (Carex crawfordii)
Origin: Native
Flowers: June - August
Creeping sedge (Carex chordorrhiza)
Origin: Native
Cusick's sedge (Carex cusickii)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho, Montana, and Wyoming.
Habitat: Wetlands, lake and pond edges, and other wet areas.
Origin: Native
Flowers: May-August
Davy's sedge (Carex davyi)
Origin: Native
Delicate sedge (Carex leptalea)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Wet areas, both open and forested, from lowlands to subalpine.
Origin: Native
Flowers: May-August
Dense sedge (Carex densa)
Origin: Native
Flowers: April - June
Dewey's sedge (Carex deweyana)
Distribution: Occurring east of the Cascades crest in northeastern Washington; Alaska to northeastern Washington, east to Northwest Territory and south through Montana to Colorado, further eastward to the Atlantic Coast.
Habitat: Open or riparian forest, swamps, cliffs, damp thickets, and mesic meadow edges.
Origin: Native
Flowers: May-July
Different-veined sedge (Carex heteroneura)
Distribution: Occurring along the Canadian border in Washington; British Columbia south to California, east to Sasketchewan and Rocky Mountains.
Habitat: Moist to wet sites in the subalpine and alpine zones.
Origin: Native
Flowers: July-August
Douglas' sedge (Carex douglasii)
Distribution: Chiefly east of the Cascades in Washington; British Columbia south to California, east to central North America.
Habitat: Dry to wet soils in sagebrush grasslands, riparian zones, and forest margins.
Origin: Native
Flowers: April-June
Dry-spike sedge (Carex siccata)
Origin: Native
Flowers: May - July
Elk sedge (Carex geyeri)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Grassy slopes, meadows, and forest openings from the sagebrush foothills to middle elevations in the mountains.
Origin: Native
Flowers: April-July
Engelmann's sedge (Carex engelmannii)
Distribution: Occurring in the Olympic Mountains and in the Cascades Mountains south to Mt. Adams in Washington; southern British Columbia to Mt. Adams in Washington, east to Idaho, Montana, and Colorado.
Habitat: Dry or moist fellfields, rocky slopes, talus and scree, cliffs and meadows in the alpine.
Origin: Native
Flowers: July-August
European woodland sedge (Carex sylvatica)
Origin: Introduced
Falkland Island sedge (Carex macloviana)
Origin: Native
False golden sedge (Carex hassei)
Origin: Native
Few-flowered sedge (Carex pauciflora)
Distribution: Occurring west of the Cascades crest in Washington; Alaska to Washington, east across Canada to northeastern North America; circumpolar.
Habitat: Sphagnum bogs and acidic peatlands, generally at low to moderate elevations in our area.
Origin: Native
Flowers: June-July
Foetid sedge (Carex vernacula)
Origin: Native
Flowers: June - August
Foothill sedge (Carex tumulicola)
Origin: Native
Flowers: May - June
Fox sedge (Carex vulpinoidea)
Distribution: Much of the United States and southern Canada; chiefly east of the Cascades in Washington
Habitat: Marshes and standing water, lowlands and foothills
Origin: Native
Flowers: May - August
Fragile-sheath sedge (Carex fracta)
Origin: Native
Flowers: June - August
Geyer's sedge (Carex geyeri)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Grassy slopes, meadows, and forest openings from the sagebrush foothills to middle elevations in the mountains.
Origin: Native
Flowers: April-July
Golden sedge (Carex aurea)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern North America.
Habitat: Moist or wet places from the lowlands to near timberline in the mountains
Flowers: April-August
Grassy-slope arctic sedge (Carex anthoxanthea)
Distribution: Known from along the coast in Washington; Alaska south to Washington.
Habitat: Bogs and wet meadows from low to moderate elevations.
Origin: Native
Flowers: June-August
Green sedge (Carex viridula)
Origin: Native
Green-fruited sedge (Carex interrupta)
Distribution: Along the Columbia River from Douglas County through Klickitat County, south in Oregon west of the Cascades
Habitat: Rocky banks and streambeds, and other low, wet places
Origin: Native
Flowers: April - May
Green-sheath sedge (Carex feta)
Distribution: West of the Cascades, British Columbia to California
Habitat: Marshes and wet meadows from the lowlands to moderate elevations in the mountains
Origin: Native
Flowers: May - July
Hair sedge (Carex capillaris)
Origin: Native
Flowers: June - August
Halfchaff sedge (Lipocarpha aristulata)
Distribution: Occurring along the Columbia River in central and south-central Washington; Washington to California and Arizona, east in Great Plains and central U.S.
Habitat: sandy soils of shorelines, stream banks, ponds, and ditches.
Origin: Native
Flowers: June-August
Hall's sedge (Carex halliana)
Origin: Native
Flowers: June - August
Hare sedge (Carex leporina)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, and introduced in eastern North America.
Habitat: Seasonally wet prairies, swales, shores, marshes, ditches.
Origin: Native
Flowers: May-July
Hayden's sedge (Carex haydeniana)
Origin: Native
Flowers: June - August
Henderson's sedge (Carex hendersonii)
Distribution: West of the Cascades, British Columbia to California
Habitat: Boggy areas and wet woods, low to mid-elevations in the mountains
Origin: Native
Flowers: May - June
Hood's sedge (Carex hoodii)
Origin: Native
Flowers: May - June
Inflated sedge (Carex utriculata)
Origin: Native
Inflated sedge (Carex vesicaria)
Origin: Native
Flowers: June - August
Inland sedge (Carex interior)
Origin: Native
Flowers: May - July
Interrupted sedge (Carex interrupta)
Distribution: Along the Columbia River from Douglas County through Klickitat County, south in Oregon west of the Cascades
Habitat: Rocky banks and streambeds, and other low, wet places
Origin: Native
Flowers: April - May
Japanese sedge (Carex kobomugi)
Origin: Introduced
Jelly bean sedge (Carex leptalea)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Wet areas, both open and forested, from lowlands to subalpine.
Origin: Native
Flowers: May-August
Jones' sedge (Carex jonesii)
Origin: Native
Flowers: June - August
Lake sedge (Carex lacustris)
Distribution: Occurring in the northeastern corner of Washington; Alberta south to Idaho, east across the northern half of North America to the Atlantic Coast.
Habitat: Wetland, swamps, and marshes.
Origin: Native
Flowers: July-August
Lake Tahoe sedge (Carex tahoensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to California, east to Alberta, Montana, and Colorado.
Habitat: Generally subalpine and alpine rocky slopes, ridges, talus and scree, and dry meadows.
Origin: Native
Flowers: June-August
Leers's sedge (Carex divulsa)
Origin: Introduced
Lesser panicled sedge (Carex diandra)
Origin: Native
Flowers: June - July
Lesser tussock sedge (Carex diandra)
Origin: Native
Flowers: June - July
Liddon's sedge (Carex petasata)
Origin: Native
Flowers: May - July
Limestone sedge (Carex saxatilis)
Origin: Native
Flowers: June - August
Long's sedge (Carex longii)
Origin: Introduced
Long-stolon sedge (Carex inops)
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia to California, south in Rocky Mountains from Alberta to New Mexico, east to the Great Plains and Great Lakes region.
Habitat: Forest openings, open slopes, and near streams in the mountains.
Origin: Native
Flowers: April-July
Long-style sedge (Carex stylosa)
Distribution: Alaska to Clallam County, Washington, east across Canada to Labrador
Habitat: Usually near the coast
Origin: Native
Flowers: June - August
Lyngbye's sedge (Carex lyngbyei)
Distribution: Circumboreal along the seacoasts; south to northern California in our area
Habitat: Coastal marches and tidal flats
Origin: Native
Flowers: April - July
Many-fruit sedge (Carex angustata)
Distribution: Chiefly east of the Cascades crest in Washington; Washington south to California, east to Idaho.
Habitat: Wet meadows in riparian zones from low to moderate elevations.
Origin: Native
Flowers: July-August
Many-headed sedge (Carex sychnocephala)
Origin: Native
Flowers: June - August
Mertens' sedge (Carex mertensii)
Distribution: Alaska south in the mountains and the coast ranges of Oregon to northwest California
Habitat: Wet, open or shaded areas from the lowlands to near timberline
Origin: Native
Flowers: May - August
Montana sedge (Carex media)
Origin: Native
Mountain hare sedge (Carex phaeocephala)
Origin: Native
Flowers: June - August
Mountain mat sedge (Carex deflexa)
Origin: Native
Mt. Shasta sedge (Carex straminiformis)
Origin: Native
Flowers: July - August
Mud sedge (Carex limosa)
Origin: Native
Flowers: June - August
Nebraska sedge (Carex nebrascensis)
Distribution: East of the Cascades, Washington to California, east to Kansas
Habitat: Wet meadows and other wet areas, often in alkaline areas, lowlands to moderate elevations in the mountains
Origin: Native
Flowers: May - July
Northern beaked sedge (Carex rostrata)
Distribution: Alaska to Washington, east to Montana, and in the Great Lakes region
Habitat: Sphagnum bogs
Origin: Native
Flowers: June - August
Northern bog sedge (Carex gynocrates)
Origin: Native
Flowers: June - August
Northern clustered sedge (Carex arcta)
Origin: Native
Flowers: June - August
Northern meadow sedge (Carex praticola)
Origin: Native
Flowers: May - August
Northwest Territory sedge (Carex utriculata)
Origin: Native
Northwestern sedge (Carex concinnoides)
Origin: Native
Flowers: April - July
One-sided sedge (Carex unilateralis)
Origin: Native
Flowers: May - July
Oval broom sedge (Carex leporina)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, and introduced in eastern North America.
Habitat: Seasonally wet prairies, swales, shores, marshes, ditches.
Origin: Native
Flowers: May-July
Oval sedge (Carex leporina)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, and introduced in eastern North America.
Habitat: Seasonally wet prairies, swales, shores, marshes, ditches.
Origin: Native
Flowers: May-July
Oxbow sedge (Carex vesicaria)
Origin: Native
Flowers: June - August
Pacific bog sedge (Kobresia myosuroides)
Origin: Native
Flowers: June - August
Pale green sedge (Carex pallescens)
Origin: Introduced
Pale sedge (Carex livida)
Distribution: Occurring west of the Cascades crest in Washington; Alaska to California, east to Alberta, Montana, Colorado, and eastern North America; also in South America; circumpolar.
Habitat: Peatlands, stream banks, and wet open forests from lowlands to montane.
Origin: Native
Flowers: May-July
Parry's sedge (Carex parryana)
Distribution: Alaska to Washington, east to Manitoba, Montana, and Wyoming.
Origin: Native
Pendulous sedge (Carex pendula)
Origin: Introduced
Plains oval sedge (Carex brevior)
Origin: Native
Flowers: May - July
Poor sedge (Carex magellanica)
Origin: Native
Porcupine sedge (Carex hystericina)
Origin: Native
Flowers: May - June
Presl's sedge (Carex preslii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Idaho, and Montana.
Habitat: Open, dry to seasonally dry areas from montane to alpine.
Origin: Native
Flowers: June-August
Pumpkin sedge (Carex aurea)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern North America.
Habitat: Moist or wet places from the lowlands to near timberline in the mountains
Flowers: April-August
Quill sedge (Carex tenera)
Origin: Native
Flowers: May - August
Raynolds' sedge (Carex raynoldsii)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Subalpine and alpine meadows.
Origin: Native
Flowers: June-August
Retrorse sedge (Carex retrorsa)
Origin: Native
Flowers: May - September
Riverbank sedge (Carex stenoptila)
Origin: Native
Rope-root sedge (Carex chordorrhiza)
Origin: Native
Ross' sedge (Carex rossii)
Origin: Native
Flowers: May - August
Russet sedge (Carex saxatilis)
Origin: Native
Flowers: June - August
Rusty sedge (Carex subfusca)
Origin: Native
Flowers: June - August
Sand sedge (Carex pansa)
Distribution: Along the coast in Washington; Washington south to California.
Habitat: Dunes, meadows, and other open areas along the coast.
Origin: Native
Flowers: May-June
Scandinavian sedge (Carex media)
Origin: Native
Sheldon's sedge (Carex sheldonii)
Origin: Native
Short-beaked sedge (Carex brevior)
Origin: Native
Flowers: May - July
Short-leaf sedge (Carex disperma)
Origin: Native
Flowers: June - August
Short-scaled sedge (Carex leptopoda)
Origin: Native
Short-stemmed sedge (Carex zikae)
Origin: Native
Showy sedge (Carex spectabilis)
Distribution: Alaska to California, east to Alberta and Montana
Habitat: Damp meadows and other wet places, mid- to high elevations in the mountains
Origin: Native
Flowers: June - August
Sierra hare sedge (Carex leporinella)
Origin: Native
Flowers: July - August
Silver-spiked sedge (Carex buchananii)
Origin: Introduced
Silvery sedge (Carex canescens)
Origin: Native
Flowers: June - August
Single-spike sedge (Carex scirpoidea)
Origin: Native
Flowers: June - August
Slender sedge (Carex tenera)
Origin: Native
Flowers: May - August
Slender-beak sedge (Carex athrostachya)
Origin: Native
Flowers: May - August
Slenderfoot sedge (Carex leptopoda)
Origin: Native
Slough sedge (Carex obnupta)
Distribution: Occurring west of the Cascades crest in Washington; northern British Columbia to California.
Habitat: Sloughs, shores, wet meadows, riparian forest and ditches, in either sun or shade.
Origin: Native
Flowers: April-July
Small-bracted sedge (Carex subbracteata)
Origin: Introduced
Small-flowered halfchaff sedge (Lipocarpha micrantha)
Origin: Native
Flowers: June - September
Small-head sedge (Carex illota)
Origin: Native
Flowers: June - August
Small-winged sedge (Carex microptera)
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory south to Mexico, east to the Rocky Mountains.
Habitat: Moist to dry meadows and streambanks.
Origin: Native
Flowers: June-August
Smoky Mountain sedge (Carex proposita)
Origin: Native
Flowers: July - August
Smooth-beaked sedge (Carex integra)
Origin: Native
Smooth-fruited sedge (Carex heteroneura)
Distribution: Occurring along the Canadian border in Washington; British Columbia south to California, east to Sasketchewan and Rocky Mountains.
Habitat: Moist to wet sites in the subalpine and alpine zones.
Origin: Native
Flowers: July-August
Smooth-stemmed sedge (Carex laeviculmis)
Origin: Native
Flowers: June - August
Sparse-flower sedge (Carex tenuiflora)
Origin: Native
Spikenard sedge (Carex nardina)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to Oregon and Nevada, east to the Rocky Mountains, and east across northern Canada to eastern North America; circumpolar.
Habitat: Alpine rocky outcroppings, slopes, and ridges.
Origin: Native
Flowers: June-August
Spring sedge (Carex luzulina)
Origin: Native
Flowers: June - August
Teacher's sedge (Carex praeceptorum)
Origin: Native
Flowers: July - August
Tetrastigmatic sedge (Carex concinnoides)
Origin: Native
Flowers: April - July
Thick-head sedge (Carex pachystachya)
Origin: Native
Flowers: May - August
Thread-leaved sedge (Carex filifolia)
Origin: Native
Flowers: April - July
Three-way sedge (Dulichium arundinaceum)
Distribution: Chiefly west of the Cascades in Washington, but also in Chelan, Yakima and Pend Oreille counties; British Columbia south to California, east to Idaho, Montana and to the eastern half of North America.
Habitat: Wet meadows, marshes, and shores of ponds and lakes.
Origin: Native
Flowers: July-September
Timberline sedge (Carex micropoda)
Origin: Native
Torrent sedge (Carex nudata)
Origin: Native
Flowers: May - June
Tribulation sedge (Carex tribuloides)
Distribution: In Washington known only from King and Pierce counties; central Great Plains of the U.S. north and east to Atlantic Coast
Habitat: Lowland riparian areas, likely associated with disturbance.
Origin: Introduced
Flowers: July-August
Valley sedge (Carex vallicola)
Origin: Native
Flowers: April - July
Walking sedge (Eleocharis rostellata)
Origin: Native
Flowers: June - August
Weak-veined sedge (Carex infirminervia)
Origin: Native
Western halfchaff sedge (Lipocarpha occidentalis)
Origin: Native
Flowers: June - September
Wheat sedge (Carex atherodes)
Origin: Native
Flowers: June - August
Wide-fruited sedge (Carex angustata)
Distribution: Chiefly east of the Cascades crest in Washington; Washington south to California, east to Idaho.
Habitat: Wet meadows in riparian zones from low to moderate elevations.
Origin: Native
Flowers: July-August
Woodrush sedge (Carex luzulina)
Origin: Native
Flowers: June - August
Woolly sedge (Carex pellita)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; widely distributed throughout North America except southeastern U.S.
Habitat: Wet to dry meadows from low elevations to montane.
Origin: Native
Flowers: April-July
Yellow sedge (Carex flava)
Origin: Native
Flowers: June - August
Yellow-flowered sedge (Carex anthoxanthea)
Distribution: Known from along the coast in Washington; Alaska south to Washington.
Habitat: Bogs and wet meadows from low to moderate elevations.
Origin: Native
Flowers: June-August
Yellow-green sedge (Carex flava)
Origin: Native
Flowers: June - August
Zika's sedge (Carex zikae)
Origin: Native
Bushy seablite seepweed (Suaeda nigra)
Distribution: Occurring in Klickitat County in Washington; south-central Washington to California, east to the Great Plains.
Habitat: Alkaline soils in sagebrush flats and valleys.
Origin: Native
Flowers: June-August
Seepweed (Suaeda nigra)
Distribution: Occurring in Klickitat County in Washington; south-central Washington to California, east to the Great Plains.
Habitat: Alkaline soils in sagebrush flats and valleys.
Origin: Native
Flowers: June-August
Western seepweed (Suaeda occidentalis)
Distribution: Eastern Washington to northern Nevada, east through southern Idaho to Colorado.
Habitat: Saline or alkaline flats and marshes in sagebrush area.
Origin: Native
Flowers: Late June - August
Elegant sego lily (Calochortus elegans)
Distribution: East of the Casades crest in Washington; Washington to Oregon and northern California, east to Idaho and Montana.
Habitat: Grassy hillsides and open coniferous forests, middle to high elvations in the mountains.
Origin: Native
Flowers: May-June
Long-bearded sego-lily (Calochortus longebarbatus)
Distribution: Occurring east of the Cascades crest inYakima and Klickitat counties in Washington; south-central Washington to northern California.
Habitat: Open meadows, low to middle elevations.
Origin: Native
Flowers: June-July
Self-heal (Prunella vulgaris)
Distribution: Throughout Washington; occurring throughout all of North America.
Habitat: Moist areas, sea level to moderate elevations in the mountains.
Origin: Both native and introduced
Flowers: May-September
Bladder senna (Colutea arborescens)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east across the southwest to the Great Plains; northeastern North America.
Habitat: Disturbed open areas ncluding wastelots, roadsides, and fields.
Origin: Introduced from Eurasia
Flowers: May-June
Serpent-grass (Bistorta vivipara)
Distribution: Occurring on both sides of the Cascades in northern Washington; Alaska south to Oregon, east to Montana, and south in the Rockies to New Mexico; across Canada to Newfoundland, south to Minnesota and Maine.
Habitat: Damp areas, shady woods, meadows and streambanks at mid- to high elevations in the mountains.
Origin: Native
Flowers: June-September
Lyall's serpentweed (Tonestus lyallii)
Distribution: Occurring in the Olympics and Cascades mountains in Washington; British Columbia south to California, east to Alberta, south to Colorado.
Habitat: Mountain meadows and rocky slopes, alpine and subalpine.
Origin: Native
Flowers: July-September
Swedish service-tree (Sorbus hybrida)
Origin: Introduced
Serviceberry (Amelanchier alnifolia)
Distribution: Occurring throughout both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and Great Plains.
Habitat: Open woods, canyons and hillsides, sea level to subalpine.
Origin: Native
Flowers: April-July
Utah serviceberry (Amelanchier utahensis)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to Baja California, east to the Rocky Mountains.
Habitat: Rimrock, valleys, gullies and hillsides, from sagebrush desert to mid-elevations in the mountains.
Origin: Native
Flowers: May-June
Shadscale (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
Mountain sheep's bit (Jasione montana)
Origin: Introduced
Bristly sheepburr (Lappula squarrosa)
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America; Eurasia.
Habitat: Shrub-steppe, disturbed areas, roadside.
Origin: Introduced from Eurasia, possibly native in northern Rocky Mts. (Cronquist et al. 1984)
Flowers: June-August
Shepherd's-purse (Capsella bursa-pastoris)
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Weed of disturbed ground.
Origin: Introduced from Europe
Flowers: March-July
Alpine shooting star (Dodecatheon alpinum)
Distribution: Occurring in the south-central portion of Washington; Washington to California, east to Utah and Arizona.
Habitat: Moist to wet areas in the mountains.
Origin: Native
Flowers: June-August
Bonneville shooting star (Dodecatheon conjugens)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Alberta and Wyoming.
Habitat: Vernally moist areas in sagebrush to meadows at mid-elevations in the mountains
Origin: Native
Flowers: April-June
Broad-leaved shooting star (Dodecatheon hendersonii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California.
Habitat: Woods and prairies, at low elevations in our area.
Origin: Native
Flowers: March-June
Darkthroat shooting star (Dodecatheon pulchellum)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to Mexico, east to the Great Plains.
Habitat: Coastal prairies to inland saline swamps and shrub-steppe, sea level to timberline
Origin: Native
Flowers: April-July
Henderson's shooting star (Dodecatheon hendersonii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California.
Habitat: Woods and prairies, at low elevations in our area.
Origin: Native
Flowers: March-June
Jeffrey's shooting star (Dodecatheon jeffreyi)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Montana and Wyoming.
Habitat: Wet meadows and stream banks, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Narcissus shooting star (Dodecatheon poeticum)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Wasco and Hood River counties, Oregon.
Habitat: Grassy slopes to drier woods, usually where vernally moist, often near seeps or springs along basaltic outcrops.
Origin: Native
Flowers: March-May
Poet's shooting star (Dodecatheon poeticum)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Wasco and Hood River counties, Oregon.
Habitat: Grassy slopes to drier woods, usually where vernally moist, often near seeps or springs along basaltic outcrops.
Origin: Native
Flowers: March-May
Slimpod shooting star (Dodecatheon conjugens)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Alberta and Wyoming.
Habitat: Vernally moist areas in sagebrush to meadows at mid-elevations in the mountains
Origin: Native
Flowers: April-June
Tall mountain shooting star (Dodecatheon jeffreyi)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Montana and Wyoming.
Habitat: Wet meadows and stream banks, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Tundra shooting star (Dodecatheon austrofrigidum)
Distribution: Occurring in coastal counties in southwestern Washington; Washington to northwestern Oregon in coastal counties.
Habitat: Moist basaltic slopes, cliff faces, in coniferous forests along streams, or in alpine meadows.
Origin: Native
Flowers: April-June
White shooting star (Dodecatheon dentatum)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to northern Oregon; also in central Idaho
Habitat: Streambanks and other wet places at moderate elevations in the mountains
Origin: Native
Flowers: May-July
Shotweed (Cardamine hirsuta)
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common west of the crest; British Columbia to California, east to Idaho and Montana, and throughout much of eastern North America.
Habitat: Disturbed ground at low elevations.
Origin: Introduced from Eurasia
Flowers: March-June
Creeping sibbaldia (Sibbaldia procumbens)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout western North America and northeastern North America; circumboreal.
Habitat: Open, dry to moist subalpine and alpine slopes.
Origin: Native
Flowers: June-August
Sicklegrass (Parapholis incurva)
Origin: Introduced
Meadow sidalcea (Sidalcea campestris)
Distribution: Native only to the Willamette Valley area (Multnomah and Washington to Benton and Linn counties). Introduced as a garden plant in western Washington, but rarely persisting.
Habitat: Dry fields and roadsides.
Origin: Introduced
Flowers: May-July
Sidebells (Orthilia secunda)
Distribution: Alaska to California, east to New Mexico in the west, and across the northern half of the United States to the Atlantic
Habitat: Common in coniferous woods at moderate to mid-elevationn in the mountains
Origin: Native
Flowers: June - August
Douglas's silene (Silene douglasii)
Distribution: Widely distributed throughout most of Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Sagebrush plains to mountain slopes.
Origin: Native
Flowers: May-July
Parry's silene (Silene parryi)
Distribution: Widely distributed across Washington; Alaska south to Oregon, east in the mountains to Montana and Utah.
Habitat: Open areas, mid- to high elevations in the mountains.
Origin: Native
Flowers: July-August
Seely's silene (Silene seelyi)
Distribution: Wenatchee Mountains, Kittitas and Chelan Counties, Washington.
Habitat: Cliffs and talus slopes at moderate to mid-elevations in the mountains.
Origin: Native
Flowers: Late May - August
Spalding's silene (Silene spaldingii)
Distribution: Occurring in southeastern counties of Washington; southeastern Washington to adjacent northeastern Oregon and western Idaho, also in western Montana.
Habitat: Sagebrush, scabland and ponderosa pine forests.
Origin: Native
Flowers: June-July
Dense silky-bent (Apera interrupta)
Distribution: Occurring chiefly east of the Cascades in Washington; British Columbia south to Oregon, east to Idaho and Montana.
Habitat: Dry wasteland and other disturbed areas in shrub-steppe and open coniferous forests.
Origin: Introduced
Flowers: May-July
American silver-berry (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
False silverback (Rainiera stricta)
Distribution: Occurring on both sides of the Cascades crest in south-central Washington; Washington south to Oregon.
Habitat: Meadows and moist, open hillsides at mid- to high elevations in the mountains.
Origin: Native
Flowers: July-August
Littleleaf silverback (Luina hypoleuca)
Distribution: Occurring on both sides of the Cascades crest and in the Olympic Mountains in Washington; British Columbia to California.
Habitat: Open, rocky areas, from moist to somewhat dry, at middle to high elevations in the mountains.
Origin: Native
Flowers: June-October
Tall silvercrown (Cacaliopsis nardosmia)
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to California.
Habitat: Meadows, forest edge, forest openings, and light forest understory from low to middle elevations.
Origin: Native
Flowers: May-July
Chinese silvergrass (Miscanthus sinensis)
Origin: Introduced
Coastal silverpuffs (Microseris bigelovii)
Distribution: Known historically from west of the Cascades crest in the San Juan Islands in Washington, but now considered extirpated; southwestern British Columbia to California.
Habitat: Coastal sandy soils, dunes, occasionally in rocky areas, coastal islands, headlands, and bluffs.
Origin: Native
Flowers: May-June
Lindley's false silverpuffs (Uropappus lindleyi)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Idaho, south to Texas.
Habitat: Open hillsides, forest openings, from low to mid-elevations.
Origin: Native
Flowers: March-May
Nodding silverpuffs (Microseris nutans)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Slopes, meadows, flats, and forest openings,often in somewhat moist places, from low to middle elevations.
Origin: Native
Flowers: April-July
Northern silverpuffs (Microseris borealis)
Distribution: Occurring west of the Cascades crest in Washington; southern Alaska to northern California.
Habitat: Sphagnum bogs and wet meadows in the mountains.
Origin: Native
Flowers: June-August
Common silverweed (Potentilla anserina)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Distributed widely across much of North America except south-central and southeastern U.S.
Habitat: Wet, alkaline areas from coast to arid inlands.
Origin: Native
Flowers: April-August
Single-delight (Moneses uniflora)
Distribution: Distributed on both sides of the Cascades in Washington; Alaska south to California, east to the Rocky Mountains and in eastern North America.
Habitat: Moist woods with high-humas soils, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Rush skeletonplant (Lygodesmia juncea)
Distribution: Known from Spokane County in Washington; southeastern British Columbia to eastern Washington, Idaho and Nevada, east to Great Plains and Great Lakes region.
Habitat: Dry, open places, often in sandy soil, from low to middle elevations.
Origin: Native
Flowers: June-September
Rush skeletonweed (Chondrilla juncea)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Montana; also occurring in eastern North America.
Habitat: Roadsides, fields, sagebrush desert, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: July-September
Thorny skeletonweed (Pleiacanthus spinosus)
Origin: Introduced?
Hooded skullcap (Scutellaria galericulata)
Distribution: Both sides of the Cascades in Washington; circumboreal, extending south to California, Arizona and Missouri.
Habitat: Wet meadows and similar habitats at moderate elevations.
Origin: Native
Flowers: June-August
Mad-dog skullcap (Scutellaria lateriflora)
Distribution: Both sides of the Cascades in Washington; occurring throughout North America.
Habitat: Moist bottomlands and meadows, low to moderate elevations.
Origin: Native
Flowers: July-September
Marsh skullcapp (Scutellaria galericulata)
Distribution: Both sides of the Cascades in Washington; circumboreal, extending south to California, Arizona and Missouri.
Habitat: Wet meadows and similar habitats at moderate elevations.
Origin: Native
Flowers: June-August
Skunkweed (Navarretia squarrosa)
Distribution: West of the Cascades, from southern Vancouver Island, British Columbia, to California.
Habitat: Open places, mostly at low elevations.
Origin: Native
Flowers: June - September
Skyrocket (Ipomopsis aggregata)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains, Oklahoma and Texas.
Habitat: Open or lightly wooded, drier meadows and rocky slopes, lowlands to fairly high elevations in the mountains.
Origin: Native
Flowers: May-August
Small-flower skyrocket (Microgilia minutiflora)
Distribution: Occurring east of the Cascades crest in Washington; south-central British Columbia to eastern Oregon, east to western Montana and southern Idaho.
Habitat: Dry, sandy places at low elev, often with sagebrush.
Origin: Native
Flowers: April-June
Sleepydick (Ornithogalum umbellatum)
Distribution: Distributed in scattered locations throughout Washington; occurring chiefly in central and eastern United States, with scattered locations in western states.
Habitat: Roadsides, open forests, waste places.
Origin: Introduced from Eurasia
Flowers: April-May
Fairy slipper (Cypripedium parviflorum)
Distribution: Occurring east of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains; throughout most of Canada and the central, southeastern, and northeastern regions of the U.S.
Habitat: Bogs and damp woods.
Origin: Native
Flowers: May-June
Yellow lady's-slipper slipper (Cypripedium parviflorum)
Distribution: Occurring east of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains; throughout most of Canada and the central, southeastern, and northeastern regions of the U.S.
Habitat: Bogs and damp woods.
Origin: Native
Flowers: May-June
Dock-leaf smartweed (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
Dotted smartweed (Persicaria punctata)
Distribution: Occurring mostly in south-central Washington; British Columbia south to California, east to the Atlantic Coast.
Habitat: Lake and pond shores, marshes, and wet forests.
Origin: Native
Flowers: June-September
Pale smartweed (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
Smartweed (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
Swamp smartweed (Persicaria hydropiperoides)
Distribution: Chiefly west of the Cascades in Washington; British Columbia south to Mexico and South America, east across North America to the Atlantic coast.
Habitat: Moist to swampy areas, often growing in mud, from the lowlands to the lower mountain valleys.
Origin: Native
Flowers: July-September
Water smartweed (Persicaria amphibia)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
Habitat: River, stream, lake, and pond margins in water to 2 meters deep to adjacent moist uplands.
Origin: Native
Flowers: July-October
Water smartweed (Persicaria punctata)
Distribution: Occurring mostly in south-central Washington; British Columbia south to California, east to the Atlantic Coast.
Habitat: Lake and pond shores, marshes, and wet forests.
Origin: Native
Flowers: June-September
Alpine smelowskia (Smelowskia americana)
Distribution: In the Olympic and Cascades mountains in Washington; British Columbia and Alberta south to Nevada, east to the Rocky Mountains.
Habitat: Rocky areas at high elevations in the mountains.
Origin: Native
Flowers: May-August
Short-fruited smelowskia (Smelowskia ovalis)
Distribution: In the Cascades Mountains in Washington; British Columbia south to California.
Habitat: Rocky crevices, moraines, ridges and talus slopes in alpine and sup-alpine regions.
Origin: Native
Flowers: June-August
Siberian smelowskia (Smelowskia americana)
Distribution: In the Olympic and Cascades mountains in Washington; British Columbia and Alberta south to Nevada, east to the Rocky Mountains.
Habitat: Rocky areas at high elevations in the mountains.
Origin: Native
Flowers: May-August
Prairie smoke (Geum triflorum)
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to California, east to the northern Great Plains, and Great Lakes regions.
Habitat: Prairies, balds, and moister places in the sagebrush plains, from the foothills to subalpine ridges.
Origin: Native
Flowers: April-August
Smooth medic (Medicago polymorpha)
Distribution: Occurring chiefly west of the Cascades crest in Washington; southwestern British Columbia to California, scattered eastward across much of North America.
Habitat: Waste ground and disturbed areas, mostly at low elevations.
Origin: Introduced
Flowers: March-June
Fivehorn smotherweed (Bassia hyssopifolia)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains and Great Plains.
Habitat: Noxious weed of waste areas and irrigated farm land.
Origin: Introduced from Eurasia
Flowers: July-September
Western snakeroot (Ageratina occidentalis)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Montana, Utah, and Nevada.
Habitat: Rocky places at various altitudes.
Origin: Native
Flowers: June-August
Broom snakeweed (Gutierrezia sarothrae)
Distribution: East of the Cascades in Washington, chiefly in southeastern part of state; Alberta to Manitoba, south to California and Texas.
Habitat: Dry, open places in the foothills, valleys and plains.
Origin: Native
Flowers: July-September
Garden snapdragon (Antirrhinum majus)
Distribution: Occasionally escaped from cultivation in western Washington.
Habitat: Disturbed areas in urban settings.
Origin: Introduced from Europe
Flowers: May-July
Greater snapdragon (Antirrhinum majus)
Distribution: Occasionally escaped from cultivation in western Washington.
Habitat: Disturbed areas in urban settings.
Origin: Introduced from Europe
Flowers: May-July
Lesser snapdragon (Misopates orontium)
Distribution: Occasionally escaped from cultivation in western Washington.
Habitat: Disturbed areas in urban settings.
Origin: Introduced
Flowers: May-July
Common sneezeweed (Helenium autumnale)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Stream banks and other moist, low ground generally at low elevations.
Origin: Native
Flowers: July-September
Large flowered sneezeweed (Helenium autumnale)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Stream banks and other moist, low ground generally at low elevations.
Origin: Native
Flowers: July-September
Weasel's snout (Misopates orontium)
Distribution: Occasionally escaped from cultivation in western Washington.
Habitat: Disturbed areas in urban settings.
Origin: Introduced
Flowers: May-July
Snow queen (Veronica regina-nivalis)
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Forest understory at low to moderate elevations.
Origin: Native
Flowers: March-May
Snow-in-summer (Cerastium tomentosum)
Distribution: Occasionally escaping cultivation in lowland northwestern Washington; British Columbia to Oregon, east across northern U.S. and southern Canada to Atlantic Coast.
Habitat: Fields, roadsides, waste sites.
Origin: Introduced
Flowers: April-May
Common snowberry (Symphoricarpos albus)
Distribution: Occurring on both sides of the Cascades crest and distributed widely throughout Washington; Alaska to California, east to the Great Plains, and further east to northeastern North America.
Habitat: Thickets, forest edge, and open slopes, from the lowlands to middle elevations in the mountains.
Origin: Native
Flowers: May-August
Creeping snowberry (Symphoricarpos mollis)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Nevada, disjunct in north-central Idaho.
Habitat: Slopes and forest edge, often where wet, from low to middle elevations.
Origin: Native
Flowers: May-July
Mountain snowberry (Symphoricarpos rotundifolius)
Distribution: Occurring chiefly east of the Cascades in Washington; British Columbia to California east to Rocky Mountains and Great Plains.
Habitat: Open slopes and dry meadows, from sagebrush desert to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Western snowberry (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
Snowdrop (Galanthus nivalis)
Distribution: Garden escape in northeastern United States and adjacent Canada; occasional in western Washington.
Habitat: Abandoned gardens, roadsides, open forests.
Origin: Introduced from Europe
Flowers: February - March
Soapberry (Shepherdia canadensis)
Distribution: Both sides of the Cascades in Washington; Alaska to Oregon, east to the Atlantic Coast.
Habitat: Moderately dry, open to wooded areas, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Rock soapwort (Saponaria ocymoides)
Distribution: Garden plant, occasionally escaping but rarely persistent, in the Pacific Coast states and a few states in eastern United States.
Habitat: Old gardens, waste sites and rocky places.
Origin: Introduced from Europe
Flowers: June - July
Creeping softgrass (Holcus mollis)
Origin: Introduced
Common soliva (Soliva sessilis)
Distribution: Known from western Washington, Oregon, and British Columbia
Habitat: Disturbed areas, roadsides, lawns
Origin: Introduced from South America
Flowers: May-June
Prickly soliva (Soliva sessilis)
Distribution: Known from western Washington, Oregon, and British Columbia
Habitat: Disturbed areas, roadsides, lawns
Origin: Introduced from South America
Flowers: May-June
Star-flowered Solomon's-seal (Maianthemum stellatum)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Great Plains, Great Lakes region, and northeastern North America.
Habitat: Moist woods and streambanks to open, rocky hillsides from low elevations to the subalpine.
Origin: Native
Flowers: May-July
Two-leaf false Solomon's-seal (Maianthemum dilatatum)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; Alaska to California, east to northern Idaho.
Habitat: Shady, moist areas, open to dense woods, from sea level to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Soopolallie (Shepherdia canadensis)
Distribution: Both sides of the Cascades in Washington; Alaska to Oregon, east to the Atlantic Coast.
Habitat: Moderately dry, open to wooded areas, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Sorghum (Sorghum bicolor)
Origin: Introduced from Africa
Alpine sheep sorrel (Rumex paucifolius)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains.
Habitat: moist grasslands, stream banks, and montane to alpine meadows.
Origin: Native
Flowers: June -August
Alpine sorrel (Rumex paucifolius)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains.
Habitat: moist grasslands, stream banks, and montane to alpine meadows.
Origin: Native
Flowers: June -August
Common sheep sorrel (Rumex acetosella)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Balds, prairies, meadows, pastures, fields, roadsides, wastelots, lawns and other disturbed open areas from the lowlands to middle elevations in the mountains.
Origin: Introduced from Eurasia
Flowers: May-August
Mountain sorrel (Rumex paucifolius)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains.
Habitat: moist grasslands, stream banks, and montane to alpine meadows.
Origin: Native
Flowers: June -August
Common sow-thistle (Sonchus oleraceus)
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common west of the crest; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Forest edge, balds, prairies, roadsides, ditches, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced from Europe
Flowers: June-October
Field sow-thistle (Sonchus arvensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Balds, prairies, forest edge, stream banks, roadsides, fields, and other disturbed open areas generally at low elevations, often where moist.
Origin: Introduced from Europe
Flowers: July-October
Perennial sow-thistle (Sonchus arvensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Balds, prairies, forest edge, stream banks, roadsides, fields, and other disturbed open areas generally at low elevations, often where moist.
Origin: Introduced from Europe
Flowers: July-October
Prickly sow-thistle (Sonchus asper)
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common west of the crest; Alaska to California, east to the Atlantic Coast.
Habitat: Forest edge, balds, prairies, roadsides, ditches, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced from Europe
Flowers: June-October
Spiny leaf sow-thistle (Sonchus asper)
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common west of the crest; Alaska to California, east to the Atlantic Coast.
Habitat: Forest edge, balds, prairies, roadsides, ditches, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced from Europe
Flowers: June-October
Sowbane (Chenopodiastrum murale)
Distribution: Introduced throughout most of North America.
Habitat: Roadsides and waste areas.
Origin: Introduced
Flowers: May - August
Spanish-broom (Spartium junceum)
Distribution: West of the Cascades in Washington; Washington south to California
Habitat: Disturbed areas, roadsides, forest margins.
Origin: Introduced
Flowers: April-September
Spatterdock (Nuphar polysepala)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to Northwest Territory, Alberta, and the Rocky Mountain States.
Habitat: Ponds, shallow lakes, oxbows, and sluggish streams from low to middle elevations.
Origin: Native
Flowers: May-August
Spearmint (Mentha spicata)
Distribution: Both sides of the Cascades in Washington; widespread throughout all of North America.
Habitat: Banks of streams and ditches and other damp places.
Origin: Introduced
Flowers: June-August
Lesser spearwort (Ranunculus flammula)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; widely distributed throughout much of North America except in the southern U.S.
Habitat: Mostly in mud, often where brackish, from sea level to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
American alpine speedwell (Veronica wormskjoldii)
Distribution: Both sides of the Cascades in Washington; Alaska to California, east to Montana, Colorado and New Mexico.
Habitat: Moist ground and seeps, mid- to high elevations in the mountains.
Origin: Native
Flowers: July-September
American speedwell (Veronica americana)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Ditches, slow moving streams, oxbows, and other water bodies, from low to middle elevations in the mountains.
Origin: Native
Flowers: May-August
Bilobed speedwell (Veronica argute-serrata)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to the Rocky Mountains and Great Plains, also in scattered areas of eastern North America.
Habitat: Disturbed, open areas at low to moderate elevations.
Origin: Introduced from Eurasia
Flowers: April-June
Bird-eye speedwell (Veronica persica)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely introduced in much of North America.
Habitat: Lawns and waste ground.
Origin: Introduced from Europe
Flowers: March-May
Blue water speedwell (Veronica anagallis-aquatica)
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: In or along slow-moving streams and ditches at low to moderate elevations.
Origin: Introduced from Europe
Flowers: June-September
Chain speedwell (Veronica catenata)
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Slow-moving streams and ditches.
Origin: Introduced from Europe
Flowers: June-August
Common speedwell (Veronica officinalis)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to the northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Roadsides, fields, balds, prairies, ditches, forest edge, lawns, wastelots, and other disturbed open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: April-July
Corn speedwell (Veronica arvensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Disturbed ground, gardens and roadsides
Origin: Introduced from Eurasia
Flowers: April-September
Cusick's speedwell (Veronica cusickii)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho and Montana.
Habitat: Open, moist, rocky slopes from subalpine to alpine.
Origin: Native
Flowers: July-September
Finger speedwell (Veronica triphyllos)
Origin: Introduced from Europe
Germander speedwell (Veronica chamaedrys)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to Montana, also in eastern North America.
Habitat: Roadsides, fields, lawns, gardens, and other disturbed areas.
Origin: Introduced from Europe
Flowers: May-June
Grass-leaf speedwell (Veronica scutellata)
Distribution: The northern two-thirds of the temperate zone in North America; also in Eurasia.
Habitat: Wet places, from the lowlands to moderate elevations in the mountains.
Origin: Native
Flowers: May - September
Gray speedwell (Veronica polita)
Distribution: Occurring in scattered locations in the southeastern counties of Washington; southeastern Washington and adjacent Idaho, also in central and eastern North America.
Habitat: Roadsides, fields, lawns, and other disturbed open areas.
Origin: Introduced from Eurasia
Flowers: March-May
Ivy-leaf speedwell (Veronica hederifolia)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho and Utah; other scattered locations in central and eastern North America.
Habitat: Waste places, disturbed soil.
Origin: Introduced from Europe
Flowers: April-June
Lackschewitz's speedwell (Veronica ×lackschewitzii)
Distribution: Known only from Yakima County in Washington; distribution in North America not currently known.
Habitat: Slow-moving streams and ditches.
Origin: Introduced from Europe
Flowers: June-August
Long-leaf speedwell (Veronica longifolia)
Distribution: Known from only a few localities west of the Cascades crest in Washington; also known from British Columbia and Montana.
Habitat: Disturbed areas, where escaped from cultivation.
Origin: Introduced from Europe
Flowers: June-July
Marsh speedwell (Veronica scutellata)
Distribution: The northern two-thirds of the temperate zone in North America; also in Eurasia.
Habitat: Wet places, from the lowlands to moderate elevations in the mountains.
Origin: Native
Flowers: May - September
Persian speedwell (Veronica persica)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely introduced in much of North America.
Habitat: Lawns and waste ground.
Origin: Introduced from Europe
Flowers: March-May
Purslane speedwell (Veronica peregrina)
Distribution: Widely distributed throughout most of Washington; widely distributed throughout North America.
Habitat: Swales, wet meadows, stream banks, and other moist places, from the lowlands to moderate elevations in the mountains.
Origin: Both native (var. xalapensis) and introduced (var. peregrina) varieties
Flowers: April-September
Skullcap speedwell (Veronica scutellata)
Distribution: The northern two-thirds of the temperate zone in North America; also in Eurasia.
Habitat: Wet places, from the lowlands to moderate elevations in the mountains.
Origin: Native
Flowers: May - September
Spring speedwell (Veronica verna)
Origin: Introduced
Thread-stalk speedwell (Veronica filiformis)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, east to Montana, also in eastern North America.
Habitat: Weed of lawns and gardens
Origin: Introduced from Eurasia
Flowers: April-June
Thyme-leaved speedwell (Veronica serpyllifolia)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Moist meadows and shores, from the lowlands to the subalpine.
Origin: Both native and introduced
Flowers: May-August
Wall speedwell (Veronica arvensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Disturbed ground, gardens and roadsides
Origin: Introduced from Eurasia
Flowers: April-September
Yellow spiderflower (Peritoma lutea)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Rocky Mountains and Nebraska.
Habitat: Sagebrush desert to Ponderosa pine forests.
Origin: Native
Flowers: June-September
Bald spike-rush (Eleocharis erythropoda)
Origin: Native
Capitate spike-rush (Eleocharis geniculata)
Origin: Native
Dwarf spike-rush (Eleocharis coloradoensis)
Origin: Native
Few-flowered spike-rush (Eleocharis quinqueflora)
Distribution: Circumboreal, south in North America to California and New Jersey.
Habitat: Bogs and other wet places, from the lowlands to high elevations in the mountains.
Origin: Native
Flowers: June - August
Redfoot spike-rush (Eleocharis erythropoda)
Origin: Native
Slender spike-rush (Eleocharis uniglumis)
Origin: Native
Soft-stem spike-rush (Eleocharis mamillata)
Origin: Native
Cliff spikemoss (Selaginella scopulorum)
Origin: Native
Festoon spikemoss (Selaginella oregana)
Origin: Native
Oregon spikemoss (Selaginella oregana)
Origin: Native
Rocky Mountain spikemoss (Selaginella scopulorum)
Origin: Native
Wallace's spikemoss (Selaginella wallacei)
Distribution: British Columbia through central Oregon to California, east to Montana
Habitat: Exposed, terrestrial, often rocky sites, such as pocket of soil in ledges and cliffs
Origin: Native
False spikenard (Maianthemum racemosum)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains, also from the central U.S. to the Atlantic Coast of eastern North America.
Habitat: Open woodlands, forest edge, moist meadow and forest openings from sea level to middle elevations in the mountains.
Origin: Native
Flowers: April-July
Beaked spikerush (Eleocharis rostellata)
Origin: Native
Flowers: June - August
Blunt spikerush (Eleocharis obtusa)
Origin: Native
Bolander's spikerush (Eleocharis bolanderi)
Origin: Native
Common spikerush (Eleocharis palustris)
Distribution: Widespread in temperate amd cold-temperate regions of the Northern hemisphere; common in the Pacific Northwest.
Habitat: Wet places from sea level to moderate elevations in the mountains; tolerant of alkali.
Origin: Native
Flowers: May - August
Creeping spikerush (Eleocharis macrostachya)
Origin: Native
Engelman spikerush (Eleocharis engelmannii)
Distribution: Widespread in the northern hemisphere; found throughout the Pacific Northwest.
Habitat: Marshes and other wet places, from sea level to moderate elevations in the mountains.
Origin: Native
Flowers: June - September
Little-head spikerush (Eleocharis parvula)
Distribution: Vancouver Island, British Columbia, to Newfoundland, south to northern South America.
Habitat: Wet, saline or alkaline soils.
Origin: Native
Flowers: June - September
Needle spikerush (Eleocharis acicularis)
Distribution: Circumboreal, south to Florida and Mexico, found in the Pacific Northwest.
Habitat: Marshes, muddy shores, and other wet places.
Origin: Native
Flowers: June - September
Ovoid spikerush (Eleocharis ovata)
Distribution: Widespread in the Northern Hemisphere; found throughout the Pacific Northwest.
Habitat: Marshes and other wet places, from sea level to moderate elevagtions in the mountains.
Origin: Native
Flowers: June - September
Pretty spikerush (Eleocharis bella)
Origin: Native
Flowers: June - September
Suksdorf spikerush (Eleocharis suksdorfiana)
Distribution: Occurring on both sides of the Cascades crest in Washington, but not in the Olympic Mountains; central British Columbia to California, east to Montana, Wyoming, and Colorado.
Habitat: Shores, peatlands, wet meadows, and seeps from middle elevations to the subalpine.
Origin: Native
Common spikeweed (Centromadia pungens)
Distribution: Occurring east of the Cascades crest in central and south-central Washington; central Washington to California, where native east to Idaho, Nevada, and Arizona.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open places at low to middle elevations.
Origin: Introduced from California
Flowers: July-Sept.
French spinach (Atriplex hortensis)
Distribution: Occurring east of the Cascades crest in Washington; Alaska south to California, east to the Great Plains and in scattered locations in eastern North America.
Habitat: Disturbed areas, often where seasonally moist.
Origin: Introduced from Asia
Flowers: July-August
New Zealand spinach (Tetragonia tetragonioides)
Distribution: Occurring west of the Cascades crest along the outer coast in Washington; Washington to California, also in eastern North America.
Habitat: Sand dunes, bluffs, margins of coastal wetlands, and disturbed areas.
Origin: Introduced
Flowers: June-August
Five-tooth spineflower (Chorizanthe watsonii)
Distribution: Occurring east of the Cascades crest in central Washington; Washington to California, east to Montana, Utah, or Arizona.
Habitat: Sandy to gravelly flats and slopes, mixed grassland, saltbush and sagebrush communities, often where disturbed.
Origin: Native
Flowers: May-July
Watson's spineflower (Chorizanthe watsonii)
Distribution: Occurring east of the Cascades crest in central Washington; Washington to California, east to Montana, Utah, or Arizona.
Habitat: Sandy to gravelly flats and slopes, mixed grassland, saltbush and sagebrush communities, often where disturbed.
Origin: Native
Flowers: May-July
Douglas's spiraea (Spiraea douglasii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Montana and Colorado.
Habitat: Swamps, lake margins and damp meadows, from sea level to the subalpine.
Origin: Native
Flowers: June-August
False spiraea (Sorbaria sorbifolia)
Origin: Introduced
Gian false spiraea (Sorbaria kirilowii)
Origin: Introduced
Giant false spiraea (Sorbaria kirilowii)
Origin: Introduced
Hitchcock's spiraea (Spiraea ×hitchcockii)
Distribution: Currently only known from Pierce County in Washington; Washington south to Oregon.
Habitat: Forest openings at low to moderate elevations in the mountains.
Origin: Native
Flowers: June-August
Pyramid spiraea (Spiraea ×pyramidata)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to south Oregon, east to Idaho and Montana.
Habitat: Somewhat dry forest openings, moderate to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Rosy spiraea (Spiraea splendens)
Distribution: Chiefly in the Cascades and Olympic Mountains of Washington; British Columbia south to California and Nevada, east to Montana and Wyoming.
Habitat: Moist forest openings and rocky slopes, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Shiny-leaf spiraea (Spiraea lucida)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to Oregon, east to Saskatchewan and Wyoming.
Habitat: Stream banks and open to wooded areas, sea level to high elevations in the mountains.
Origin: Native
Flowers: June-August
Shinyleaf spiraea (Spiraea lucida)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to Oregon, east to Saskatchewan and Wyoming.
Habitat: Stream banks and open to wooded areas, sea level to high elevations in the mountains.
Origin: Native
Flowers: June-August
Subalpine spiraea (Spiraea splendens)
Distribution: Chiefly in the Cascades and Olympic Mountains of Washington; British Columbia south to California and Nevada, east to Montana and Wyoming.
Habitat: Moist forest openings and rocky slopes, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Green spleenwort (Asplenium viride)
Distribution: Both sides of the Cascades crest in Washington; Alaska to California, east across northern North America to New England and the Canadian Maritimes; circumboreal.
Habitat: Cliff crevices, especially on limestone, often near or above timberline.
Origin: Native
Maidenhair spleenwort (Asplenium trichomanes)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, also in southern Rocky Mountain states and in central U.S. and eastern North America.
Habitat: Cliff crevices and talus slopes, generally where moist.
Origin: Native
Spores: May-September
Spoonwort (Cochlearia groenlandica)
Origin: Native
Clustered salt-grassprangletop (Diplachne fusca)
Distribution: Occurring in a few scattered locations chiefly east of the Cascades crest in Washington; widely distributed throughout North America.
Habitat: Disturbed areas at low elevations.
Origin: Native
Flowers: August-September
Loose-flowered sprangletop (Diplachne fusca)
Distribution: Occurring in a few scattered locations chiefly east of the Cascades crest in Washington; widely distributed throughout North America.
Habitat: Disturbed areas at low elevations.
Origin: Native
Flowers: August-September
Farewell to spring (Clarkia amoena)
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia south to California.
Habitat: Dry, open to wooded areas, at low elevations.
Origin: Native
Flowers: May-July
Montane spring parsley (Cymopterus foeniculaceus)
Distribution: Occurring east of the Cascades crest in Washington; central Washington to northeastern Oregon, east to Montana, Wyoming and Utah.
Habitat: Forest openings, meadows, and other open, dry areas from montane to alpine areas.
Origin: Native
Flowers: May-July
Turpentine spring parsley (Cymopterus terebinthinus)
Distribution: Occurring east of the Cascades crest in Washington; north-central Washington to northeast Oregon, east to western Idaho.
Habitat: Sand dunes and other dry, open areas at low elevations.
Origin: Native
Flowers: April-June
Spring-gold (Crocidium multicaule)
Distribution: Occurring on both sides the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to Idaho.
Habitat: Dry, open areas from low to middle elevations, especially common in sagebrush.
Origin: Native
Flowers: March-May
Spring-gold (Lomatium utriculatum)
Distribution: Occurring west of the Cascades crest in Washington; southern British Columbia to California.
Habitat: Grassy balds, prairies, meadows, and open slopes, often at low elevations.
Origin: Native
Flowers: April-June
Broadleaf springbeauty (Claytonia cordifolia)
Distribution: Occurring on both sides of the Cascades crest in Washington;
Habitat: On wet soil, usually along streams, moderate to mid-elevations in the mountains.
Origin: Native
Flowers: May-September
Great Basin springbeauty (Claytonia umbellata)
Distribution: Occurring east of the Cascades crest in the Wenatchee Mountains in Washington, where disjunct from the main range of the species; Wasco and Wallowa counties, Oregon to California and western Nevada, disjunct in the Wenatchee Mountains of Washington.
Habitat: Montane to subalpine talus and scree.
Origin: Native
Flowers: June-July
Heart-leaf springbeauty (Claytonia cordifolia)
Distribution: Occurring on both sides of the Cascades crest in Washington;
Habitat: On wet soil, usually along streams, moderate to mid-elevations in the mountains.
Origin: Native
Flowers: May-September
Lake Washington springbeauty (Claytonia washingtoniana)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to Oregon.
Habitat: Coastal bluffs and coniferous forests at low elevations, typically where moist.
Origin: Native
Flowers: January-June
Lanceleaf springbeauty (Claytonia lanceolata)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Sasketchewan.
Habitat: Sagebrush foothills to alpine slopes, usually where vernally moist.
Origin: Native
Flowers: April-July
Rydberg's springbeauty (Claytonia multiscapa)
Distribution: Occurring west of the Cascades crest in Washington; in scattered locations from British Columbia south to Washington; east to Idaho, Montana, and Wyoming.
Habitat: Rocky subalpine to alpine slopes and outcroppings.
Origin: Native
Flowers: May-July
Sand springbeauty (Claytonia arenicola)
Distribution: Occurring east of the Cascades crest along the eastern border of Washington and in the Columbia River Gorge; Washington to Oregon, east to Idaho and western Montana.
Habitat: Mossy and rocky places, from sagebrush desert to ponderosa pine forest openings.
Origin: Native
Flowers: March-June
Siberian springbeauty (Claytonia sibirica)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Montana and northeastern Oregon and southeastern Idaho.
Habitat: Moist, usually shady places, lowlands to mid-elevations in the mountains.
Origin: Native
Flowers: March-September
Small-flowered springbeauty (Claytonia parviflora)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains.
Habitat: Open rocky areas, open forest, forest edge, and disturbed areas.
Origin: Native
Flowers: March-June
Streambank springbeauty (Montia parvifolia)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Idaho and Montana.
Habitat: Dry soils, rocky outcrops, and other open, exposed areas from the coast to the subalpine.
Origin: Native
Flowers: May-July
Western springbeauty (Claytonia sibirica)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Montana and northeastern Oregon and southeastern Idaho.
Habitat: Moist, usually shady places, lowlands to mid-elevations in the mountains.
Origin: Native
Flowers: March-September
Engelmann's spruce (Picea engelmannii)
Distribution: British Columbia south through the Cascades of Washington and Oregon to Shasta County, California, east to Montana and New Mexico.
Habitat: Moderate to high elevations in the mountains, mostly where somewhat moist.
Origin: Native
Cones: New cones from June-August
Interior spruce (Picea ×albertiana)
Origin: Native
Sitka spruce (Picea sitchensis)
Distribution: Occurring west of the Cascades crest in Washington; Alaska to California.
Habitat: Along the coast, from sea level up to about 2,000 feet in moist valleys.
Origin: Native
Cones: May-June
Balkan spurge (Euphorbia oblongata)
Distribution: Occurring west of the Cascades crest in lowland western Washington; southwestern British Columbia to California.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: May-July
Broad leaved glaucous spurge (Euphorbia myrsinites)
Distribution: Chiefly east of the Cascades in Washington; Washington south to California, east to Colorado and New Mexico; reported from Ottawa and Minnesota.
Habitat: Disturbed areas often arid areas or dry soils.
Origin: Introduced from Mediterranean
Flowers: April-July
Broad leaved spurge (Euphorbia platyphyllos)
Origin: Introduced from Europe
Caper spurge (Euphorbia lathyris)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia south to California and Arizona, widely distributed in eastern North America.
Habitat: Disturbed soil and wasteland.
Origin: Introduced from Eurasia
Flowers: April-May
Corrugate seeded spurge (Euphorbia glyptosperma)
Distribution: Chiefly east of the Cascades in Washington; British Columbia south to California, east to Maine and Texas.
Habitat: Dry, sandy soil, from the plains to the lower mountains.
Origin: Native
Flowers: June-September
Cypress spurge (Euphorbia cyparissias)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east across much of North America to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed areas where often escaped from cultivation.
Origin: Introduced from Eurasia
Flowers: May-August
Egg-leaf spurge (Euphorbia oblongata)
Distribution: Occurring west of the Cascades crest in lowland western Washington; southwestern British Columbia to California.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: May-July
Leafy spurge (Euphorbia virgata)
Distribution: Introduced in much of the United States, except Oklahoma to Virginia and south; mostly eastern Washington, Idaho and Montana in the Pacific Northwest
Habitat: Noxious weed of disturbed soils
Origin: Introduced
Flowers: May - June
Mediterranean spurge (Euphorbia characias)
Distribution: Known from scattered counties in lowland western Washington; not reported as occurring elsewhere in North America.
Habitat: Open slopes, rock faces, disturbed open areas.
Origin: Introduced
Flowers: June-July
Milk spurge (Euphorbia maculata)
Distribution: Occurring on both sides of the Cascades in Washington; widely distributed throughout much of North America.
Habitat: Disturbed soil and waste areas.
Origin: Introduced from eastern North America
Flowers: June-September
Myrtle spurge (Euphorbia myrsinites)
Distribution: Chiefly east of the Cascades in Washington; Washington south to California, east to Colorado and New Mexico; reported from Ottawa and Minnesota.
Habitat: Disturbed areas often arid areas or dry soils.
Origin: Introduced from Mediterranean
Flowers: April-July
Petty spurge (Euphorbia peplus)
Distribution: Occurring chiefly west of the Cascades in Washington; widely distributed throughout much of North America except central U.S.
Habitat: Weed of disturbed ground.
Origin: Introduced from Europe
Flowers: May-November
Reticulate seeded spurge (Euphorbia spathulata)
Origin: Native
Flowers: May - July
Ridge seeded spurge (Euphorbia glyptosperma)
Distribution: Chiefly east of the Cascades in Washington; British Columbia south to California, east to Maine and Texas.
Habitat: Dry, sandy soil, from the plains to the lower mountains.
Origin: Native
Flowers: June-September
Spatulate leaved spurge (Euphorbia spathulata)
Origin: Native
Flowers: May - July
Spotted spurge (Euphorbia maculata)
Distribution: Occurring on both sides of the Cascades in Washington; widely distributed throughout much of North America.
Habitat: Disturbed soil and waste areas.
Origin: Introduced from eastern North America
Flowers: June-September
Summer spurge (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
Sun spurge (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
Thyme leaved spurge (Euphorbia serpillifolia)
Distribution: Chiefly east of the Cascades in Washington; British Columbia south to Baja California, east to Alberta and Texas.
Habitat: Dry ground from the plains to the lower mountains.
Origin: Native
Flowers: May-September
Upright spurge (Euphorbia serrulata)
Origin: Introduced from Europe
Urban spurge (Euphorbia agraria)
Origin: Introduced
Wart spurge (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
Warty spurge (Euphorbia spathulata)
Origin: Native
Flowers: May - July
Spurge-laurel (Daphne laureola)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to Oregon.
Habitat: Roadsides, forest understory and edge, wastelots, and other disturbed areas in the lowlands.
Origin: Introduced from Eurasia
Flowers: March-June
Corn spurry (Spergula arvensis)
Distribution: Introduced in much of the United States; mostly west of the Cascades in Washington and Oregon
Habitat: Weed of waste ground, usually at lower elevations
Origin: Introduced from Europe
Flowers: March - October
Common three square (Schoenoplectus pungens)
Distribution: Occurring on both sides of the Cascades crest in Washington; widespread throughout North America.
Habitat: Marshes and wet, low ground; tolerent of alkali.
Origin: Native
Flowers: May-August
Squashberry (Viburnum edule)
Distribution: Widely distributed on both sides of the Cascades in Washington; Alaska south to Newfoundland, south to northern Oregon, Colorado and Pennsylvania.
Habitat: Moist woods and swamps.
Origin: Native
Flowers: May-July
Big squirreltail (Elymus multisetus)
Origin: Native
Flowers: May - August
Squirreltail (Elymus elymoides)
Distribution: British Columbia south to southern California, east to Alberta and Texas.
Habitat: Dry and rocky to moist habitats, from along the coast to inland desert plains and prairies, and in the mountains to above tree line.
Origin: Native
Flowers: May - July
Spotted St. John's-wort (Hypericum maculatum)
Origin: Introduced
Streaked St. John's-wort (Hypericum maculatum)
Origin: Introduced
Great St. John's-wort (Hypericum calycinum)
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to California; also in eastern North America.
Habitat: Roadsides, cliffs, embankments, fields, parks, forest edge, wastelots, and other disturbed areas.
Origin: Introduced from Turkey and Bulgaria
Flowers: May-July
Staggerweed (Stachys arvensis)
Distribution: West of the Cascades in Washington near Seattle and Bellingham; British Columbia south to California; Gulf Coast and northeastern U.S.
Habitat: Weed in disturbed areas.
Origin: Introduced
Flowers: April-June
Clasping twisted stalk (Streptopus amplexifolius)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, also in northeastern North America.
Habitat: Open to dense moist forests from low elevations to subalpine.
Origin: Native
Flowers: May-July
Rosy twisted stalk (Streptopus lanceolatus)
Distribution: Distributed throughout the Olympic and Cascade mountains in Washington; Alaska south to Oregon.
Habitat: Streambanks and damp woods at moderate to high elevations in the mountains.
Origin: Native
Flowers: June-August
Bushy blazing star (Mentzelia dispersa)
Distribution: East of the Cascades in Washington; Washington south to southern California, east to Montana and Colorado.
Habitat: Dry soil, from the plains into the canyons and slopes of the lower mountains.
Origin: Native
Flowers: May-July
Hairy star-of-bethleham (Gagea villosa)
Origin: Introduced
Yellow star-thistle (Centaurea solstitialis)
Distribution: Occurring chiefly east of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, meadows, grassy slopes, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: July-September
Green-banded star-tulip (Calochortus macrocarpus)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana and Nevada.
Habitat: Dry open forests, hillsides, grasslands and sagebrush, low to moderate elevations.
Origin: Native
Flowers: May-July
Arctic starflower (Lysimachia europaea)
Distribution: Both side of the Cascades in Washington; Alaska south to California, east to Alberta and Idaho.
Habitat: Bogs and swamps, low to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Broad-leaved starflower (Lysimachia latifolia)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to California, east to northern Idaho.
Habitat: Prairies, woodlands, and forest openings from low to middle elevations in the mountains.
Origin: Native
Flowers: April-July
Northern starflower (Lysimachia europaea)
Distribution: Both side of the Cascades in Washington; Alaska south to California, east to Alberta and Idaho.
Habitat: Bogs and swamps, low to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Western starflower (Lysimachia latifolia)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to California, east to northern Idaho.
Habitat: Prairies, woodlands, and forest openings from low to middle elevations in the mountains.
Origin: Native
Flowers: April-July
Water stargrass (Heteranthera dubia)
Distribution: In scattered localities in Washington, however locally common and abundant in lower Yakima River; British Columbia south to California, widespread in eastern North America.
Habitat: Quiet streams, ponds and lakes.
Origin: Native
Flowers: July-September
Iberian starthistle (Centaurea iberica)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, also in Wyoming and Kansas.
Habitat: Roadsides, fields, dry meadows, ditches, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: June-August
Maltese starthistle (Centaurea melitensis)
Distribution: Occurring chiefly west of the Cascades in Washington; British Columbia to California and Mexico, east to Texas and eastern North America.
Habitat: Roadsides, meadows, balds, fields, ditches, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from the Mediterranean region
Flowers: June-September
Montane starthistle (Centaurea montana)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to Oregon, east to Montana, Idaho, and Utah, also from Great Lakes region to northeastern North America.
Habitat: Roadsides, fields, ditches, shores, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: May-August
Purple starthistle (Centaurea calcitrapa)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to New Mexico, also in eastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced
Flowers: July-September
Red starthistle (Centaurea calcitrapa)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to New Mexico, also in eastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced
Flowers: July-September
Blunt-sepaled starwort (Stellaria obtusa)
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia south to California, east to the Canadian and Southern Rocky Mountains.
Habitat: Moist forest and riparian zone understory, talus slopes, from low to moderate elevations.
Origin: Native
Flowers: June-July
Crisped starwort (Stellaria crispa)
Distribution: Alaska to California, east to Alberta and Wyoming.
Habitat: Moist areas in the lowlands and lower mountains.
Origin: Native
Flowers: Late May - Early August
Grass-leaf starwort (Stellaria graminea)
Distribution: Introduced and abundant in eastern United States; occasional in western Washington and Idaho.
Habitat: Chiefly in lawns.
Origin: Introduced from Eurasia
Flowers: May - July
Long-leaved starwort (Stellaria longifolia)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout North America except in the south-central and southeastern U.S.
Habitat: Wet meadows, swamps, marshes, forested wetlands at low to moderate elevations.
Origin: Native
Flowers: May-August
Longstalk starwort (Stellaria longipes)
Distribution: Widely distributed throughout Washington; Alaska south to California, east to New York and New Mexico.
Habitat: Moist streambanks and rocky slopes at mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Northern bog starwort (Stellaria calycantha)
Distribution: Circumpolar, south in North America to California, Michegan and New York.
Habitat: Moist meadows and steam banks, low to high elevations.
Origin: Native
Flowers: Late May - Early August
Saltmarsh starwort (Stellaria humifusa)
Distribution: Occurring along the coast in Washington; Alaska south to Oregon, east across Canada to the Atlantic coast; circumpolar.
Habitat: Salt marshes.
Origin: Native
Flowers: June-August
Shiny starwort (Stellaria nitens)
Distribution: British Columbia to Baja California, east to Idaho and Utah.
Habitat: Gravelly prairies and stream banks to grassy hillsides at low elevations.
Origin: Native
Flowers: April - June
Umbrella starwort (Stellaria umbellata)
Distribution: Occurring chiefly east of the Cascades crest in central and south-central Washington; Alaska south to California, east to Northwest Territories, south throughout western U.S.
Habitat: Wetlands, riparian zones, stream banks.
Origin: Native
Flowers: July-August
Hardhack steeplebush (Spiraea douglasii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Montana and Colorado.
Habitat: Swamps, lake margins and damp meadows, from sea level to the subalpine.
Origin: Native
Flowers: June-August
Long-horn steer's-head (Dicentra uniflora)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Montana and Colorado.
Habitat: Well-drained soil, foothills to subalpine slopes; blooms soon after the snow leaves.
Origin: Native
Flowers: February-June
Narrowleaf stephanomeria (Stephanomeria tenuifolia)
Distribution: East of the Cascades in Washington; southern British Columbia south to California, east to Texas and western Montana.
Habitat: Dry, often rocky places, from the foothills and plains to moderate elevations in the mountains.
Origin: Native
Flowers: June-September
Stiff branched stephanomeria (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
Bog stichwort (Stellaria alsine)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to Washington in western North America; native to eastern North America; also introduced in Chile.
Habitat: Streambanks, culverts, ditches, and moist forest edges, typically where disturbed.
Origin: Introduced from Europe
Flowers: May-August
Blue stickseed (Hackelia micrantha)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Moist, open hillsides seasonally wet forest openings, and riparian corridors from montane to subalpine.
Origin: Native
Flowers: June-August
Bristly stickseed (Lappula squarrosa)
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America; Eurasia.
Habitat: Shrub-steppe, disturbed areas, roadside.
Origin: Introduced from Eurasia, possibly native in northern Rocky Mts. (Cronquist et al. 1984)
Flowers: June-August
Common stickseed (Lappula squarrosa)
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America; Eurasia.
Habitat: Shrub-steppe, disturbed areas, roadside.
Origin: Introduced from Eurasia, possibly native in northern Rocky Mts. (Cronquist et al. 1984)
Flowers: June-August
Diffuse stickseed (Hackelia diffusa)
Distribution: Occurring east of the Cascades in Washington; British Columbia south to Oregon.
Habitat: Cliffs and talus slopes.
Origin: Native
Flowers: May-July
European stickseed (Lappula squarrosa)
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America; Eurasia.
Habitat: Shrub-steppe, disturbed areas, roadside.
Origin: Introduced from Eurasia, possibly native in northern Rocky Mts. (Cronquist et al. 1984)
Flowers: June-August
Gray stickseed (Hackelia cinerea)
Distribution: Occurring east of the Cascades crest in central and eastern Washington; central Washington to Idaho and Montana.
Habitat: Open or lightly forested areas, especially on talus or cliffs, and loose stream banks, in valleys and foothills to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
Lesser showy stickseed (Hackelia venusta)
Distribution: Endemic to Chelan County, WA.
Habitat: Rocky slopes with ponderosa pine, at about 1000 feet elevation.
Origin: Native
Flowers: May-June
Long-spined stickseed (Lappula longispina)
Distribution: East of the Cascades in the Pacific Northwest; Eurasia.
Habitat: A weed in dry, disturbed places, along roadsides and on overgrazed ranges.
Origin: Introduced
Flowers: May - July
Manyflowered stickseed (Hackelia floribunda)
Distribution: Occurring east of the Cascades crest in Washington; Southern British Columbia south to California, east to the Rocky Mountains.
Habitat: Thickets, meadows, stream banks and other moist places, from low elevations to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Montane stickseed (Lappula montana)
Distribution: Occurring east of the crest in north-central Washington; central British Columbia to north-central Washington, east to Montana.
Habitat: Dry meadows and forest openings from low to middle elevations.
Origin: Native
Flowers: May-July
Nodding stickseed (Hackelia americana)
Origin: Native
Flowers: June - August
Okanogan stickseed (Hackelia ciliata)
Distribution: Spokane and Stevens Counties to Okanogan and Kittitas Counties, Washington
Habitat: Dry, open slopes and flats in areas with sagebrush or ponderosa pine.
Origin: Native
Flowers: May - June
Rough stickseed (Hackelia hispida)
Distribution: Snake River Canyon and vicinity in Oregon, Idaho and Washington; also in the Grand Coulee of Washington.
Habitat: Cliffs and talus slopes.
Origin: Native
Flowers: May - July
Showy stickseed (Hackelia venusta)
Distribution: Endemic to Chelan County, WA.
Habitat: Rocky slopes with ponderosa pine, at about 1000 feet elevation.
Origin: Native
Flowers: May-June
Taylor's stickseed (Hackelia taylorii)
Origin: Native
Western stickseed (Lappula occidentalis)
Origin: Native
Sticktight (Bidens frondosa)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Shores of ponds, lakes, backwater channels, and other wetland areas at low elevations, often where disturbed.
Origin: Native
Flowers: June-October
Western sticktight (Bidens vulgata)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across all but the southwestern U.S. to the Atlantic Coast.
Habitat: Streamsides, ponds, lakes, ditches and other moist to wet waste places.
Origin: Introduced from British Columbia
Flowers: July-October
Sticky-laurel (Ceanothus velutinus)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, South Dakota, Wyoming, and Colorado.
Habitat: Moist to dry open forests, low to mid-elevations in the mountains.
Origin: Native
Flowers: June-September
Sticky-starwort (Pseudostellaria jamesiana)
Distribution: East of the Cascades crest in Washington; Washington south to California, east to Idaho, Wyoming and New Mexico.
Habitat: Moist or dry open woods, rocky slopes and meadows, from moderate to high elevations.
Origin: Native
Flowers: May-July
Sticky-willy (Galium aparine)
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Variety of habitats, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-June
Stinkgrass (Eragrostis cilianensis)
Distribution: Central Washington south ot California, east to Maine.
Habitat: Disturbed areas and waste land, and along streams and pond margins.
Origin: Introduced from Europe
Flowers: June - October
Stinkweed (Peritoma serrulata)
Distribution: East of the Cascades in Washington; widely distributed throughout North America except Alaska and southeastern U.S.
Habitat: Sagebrush deserts and Ponderosa pine forest openings.
Origin: Native
Flowers: June-August
Stinky-Bob (Geranium robertianum)
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; Alaska to California, east to Montana, further east in Canada, the Great Lakes region, and eastern North America.
Habitat: Forest understory and forest edges, riparian zones, and other lowland areas with natural or man-made disturbances.
Origin: Introduced from Europe
Flowers: March-August
Boreal stitchwort (Sabulina rubella)
Distribution: Alaska to Greenland, south in the mountains to Oregon and New Mexico
Habitat: Subalpine to alpine meadows, ridges and talus slopes
Origin: Native
Flowers: June - August
Dwarf stitchwort (Sabulina pusilla)
Distribution: Occurring east of the Cascades crest from Klickitat County to the southeastern counties in Washington; southern Washington to California, east to northeastern Oregon and adjacent Idaho.
Habitat: Dry, rocky cliffs and outcroppings in sagebrush desert to ponderosa pine forest openings.
Origin: Native
Flowers: May-July
Slender stitchwort (Sabulina macra)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to Oregon.
Habitat: Lowlands, prairies and coastal bluffs.
Origin: Native
Flowers: April-July
Broadleaf stonecrop (Sedum spathulifolium)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; southern British Columbia to California.
Habitat: Coastal cliffs, ledges, balds, and gravelly soil in the foothills.
Origin: Native
Flowers: April-June
Ditch stonecrop (Penthorum sedoides)
Origin: Introduced
Forster's stonecrop (Sedum forsterianum)
Origin: Introduced
Lance-leaved stonecrop (Sedum lanceolatum)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains in the U.S. and Canada.
Habitat: On rocks or gravel in open, dry areas, from sea level to the alpine.
Origin: Native
Flowers: May-August
Lance-leaved stonecrop (Sedum rupicola)
Distribution: In the Cascades and Olympic Mountains of Washington; Washington east to Idaho.
Habitat: Open, exposed places, usually on rocks or in gravelly soil, at moderate elevations in the mountains.
Origin: Native
Flowers: June-August
Leiberg's stonecrop (Sedum leibergii)
Distribution: Yakima County, Washington, south to northcentral Oregon and east to southeast Washington and western Idaho; along the Snake River.
Habitat: Mossy rocks to open, gravelly hillsides, chiefly in canyons.
Origin: Native
Flowers: May - Early July
Mossy stonecrop (Crassula tillaea)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California.
Habitat: Disturbed areas, rock crevices, and sandy areas, often where seasonally wet or moist.
Origin: Introduced from Europe
Flowers: March-April
Mossy stonecrop (Sedum acre)
Distribution: Occurring chiefly west of the Cascades in Washington; British Columbia south to Oregon, east across Canada, and the central, southeastern, and northeastern U.S. to the Atlantic Coast.
Habitat: Disturbed ground at low elevation.
Origin: Introduced from Europe
Flowers: June-August
Oregon stonecrop (Sedum oreganum)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California.
Habitat: Rock ledges, talus slopes and gravelly ridges from low elevations to the subalpine.
Origin: Native
Flowers: June-August
Pacific stonecrop (Sedum divergens)
Distribution: Alaska to California, Olympic mountains and the Cascades
Habitat: Open, rocky areas, mid- to high elevations in the mountains
Origin: Native
Flowers: July - Early September
Short-leaved stonecrop (Sedum brevifolium)
Origin: Introduced from southern Europe
Spatula-leaf stonecrop (Sedum spathulifolium)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; southern British Columbia to California.
Habitat: Coastal cliffs, ledges, balds, and gravelly soil in the foothills.
Origin: Native
Flowers: April-June
Spreading stonecrop (Sedum divergens)
Distribution: Alaska to California, Olympic mountains and the Cascades
Habitat: Open, rocky areas, mid- to high elevations in the mountains
Origin: Native
Flowers: July - Early September
Stonecrop (Sedum rupicola)
Distribution: In the Cascades and Olympic Mountains of Washington; Washington east to Idaho.
Habitat: Open, exposed places, usually on rocks or in gravelly soil, at moderate elevations in the mountains.
Origin: Native
Flowers: June-August
White stonecrop (Sedum album)
Distribution: Occurring in scattered locations across Washington; British Columbia south to California, Utah, and in northeastern North America.
Habitat: Disturbed, open areas including fields, lawns, parking areas, and rocky outcroppings.
Origin: Introduced
Flowers: May-July
Wormleaf stonecrop (Sedum stenopetalum)
Distribution: Occurring chiefly east of the Cascade crest in Washington; British Columbia south to California, east to the northern Rocky Mountains.
Habitat: Grasslands and ponderosa pine forests to sub-alpine ridges, on dry, gravelly benches, rock crevices and talus.
Origin: Native
Flowers: May-July
Fringed stoneseed (Lithospermum incisum)
Origin: Native
Western stoneseed (Lithospermum ruderale)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to the Sasketchewan and the Rocky Mountains.
Habitat: Sagebrush desert to ponderosa pine forest openings, from low to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Longbeak stork's bill (Erodium botrys)
Distribution: Currently known in Washington only from Klickitat County; Washington to California, also in Texas and scattered states in the northeastern U.S.
Habitat: Disturbed, open ground.
Origin: Introduced
Flowers: March-May
Common stork's-bill (Erodium cicutarium)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, lawns, balds, prairies, wastelots, and other disturbed open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: April-July
Redstem (Erodium cicutarium)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, lawns, balds, prairies, wastelots, and other disturbed open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: April-July
Stranvaesia (Photinia davidiana)
Origin: Introduced from China
Beach strawberry (Fragaria chiloensis)
Distribution: Occurring in the coastal counties in Washington; Alaska to California.
Habitat: Sand dunes, strand, headlands, and other open coastal habitats.
Origin: Native
Flowers: April-June
Blueleaf strawberry (Fragaria virginiana)
Distribution: Distributed widely throughout Washington except in sagebrush areas; Alaska south to California, east to the Rocky Mountains.
Habitat: Open woods to gravelly meadows in the plains and lower mountains
Origin: Native
Flowers: May-August
Coastal strawberry (Fragaria chiloensis)
Distribution: Occurring in the coastal counties in Washington; Alaska to California.
Habitat: Sand dunes, strand, headlands, and other open coastal habitats.
Origin: Native
Flowers: April-June
Mountain strawberry (Fragaria virginiana)
Distribution: Distributed widely throughout Washington except in sagebrush areas; Alaska south to California, east to the Rocky Mountains.
Habitat: Open woods to gravelly meadows in the plains and lower mountains
Origin: Native
Flowers: May-August
Woodland strawberry (Fragaria vesca)
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Moist woods, stream banks and sandy meadows, low to mid-elevations in the mountains
Origin: Native
Flowers: April-June
Strawberry tree (Arbutus unedo)
Distribution: Occurring west of the Cascades crest in Washington; currently known as escaped from cultivation in Washington.
Habitat: Disturbed, open to partially sunny areas in and around urban areas, where escaped from cultivation.
Origin: Introduced
Flowers: April-September
Strawberry-tomato (Physalis grisea)
Origin: Introduced from eastern North America
Flowers: July - September
Streptanthella (Streptanthella longirostris)
Distribution: Occurring in south-central Washington; Washington south to California, east to Wyoming and New Mexico.
Habitat: Open desert and sagebrush slopes.
Origin: Native
Flowers: April-May
Gum succory (Chondrilla juncea)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Montana; also occurring in eastern North America.
Habitat: Roadsides, fields, sagebrush desert, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: July-September
Wild succory (Cichorium intybus)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east across much of North America to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: July-October
Sugarbowls (Clematis hirsutissima)
Distribution: Occurring in only a few counties in central and eastern Washington; Washington south to Oregon, east to Montana, south to Arizona and New Mexico.
Habitat: Meadows, grasslands, and forest openings.
Origin: Native
Flowers: May-June
Sugarstick (Allotropa virgata)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana, Idaho, and Nevada.
Habitat: Deep humus of coniferous forests at low to middle elevations.
Origin: Native
Flowers: May-August
Sulfurflower (Eriogonum umbellatum)
Distribution: On both sides of the Cascades in Washington; British Columbia south to California, east to Montana, Colorado and New Mexico.
Habitat: Sagebrush deserts to alpine rocky ridges.
Origin: Native
Flowers: June-September
Smooth sumac (Rhus glabra)
Distribution: East of the Cascades in Washington; British Columbia to Mexico, east to New Hampshire and Georgia.
Habitat: Dry hillsides and draws, low to moderate elevations.
Origin: Native
Flowers: April-July
Staghorn sumac (Rhus typhina)
Origin: Introduced
Little sun cup (Camissonia pusilla)
Distribution: Occurring east of the Cascades crest in central Washington. north-central Washington to California, east to southern Idaho and Utah.
Habitat: Dry, sandy slopes in sagebrush desert.
Origin: Native
Flowers: May-July
Blackfoot river suncup (Neoholmgrenia andina)
Distribution: East of the Cascades in Washington; British Columbia south to California, east to Montana and Utah.
Habitat: Dry hillsides and sagebrush scablands to the ponderosa pine forests of the foothills.
Origin: Native
Flowers: May-July
Contorted pod suncup (Camissonia contorta)
Distribution: Along the coast and along the Columbia and Snake Rivers in Washington; British Columbia south to Baja California, east to the Rocky Mountains.
Habitat: Sandy soil along the coast and along inland rivers.
Origin: Native
Flowers: April-June
Dwarf suncup (Eremothera pygmaea)
Distribution: East of the Cascades in Washington in central part of the state; Washington south to Oregon, east to Idaho.
Habitat: Vernally moist areas in open, sagebrush desert
Origin: Native
Flowers: April-June
Green river suncup (Eremothera minor)
Distribution: East of the Cascades in Washington; Washington south to California, east to Montana and Colorado.
Habitat: Sagebrush desert, often where vernally moist
Origin: Native
Flowers: April-June
Hilgard's suncup (Neoholmgrenia hilgardii)
Distribution: East of the Cascades crest in Washington; Washington south to Klickitat County, Washington, and in Multanomah County, Oregon.
Habitat: Sagebrush deserts.
Origin: Native
Flowers: May-July
Lewis river suncup (Camissonia parvula)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia south to California, east to Idaho and Nevada.
Habitat: Open to disturbed grasslands, sandy areas, sagebrush, and scrub forest.
Origin: Native
Flowers: March-June
Obscure suncup (Neoholmgrenia andina)
Distribution: East of the Cascades in Washington; British Columbia south to California, east to Montana and Utah.
Habitat: Dry hillsides and sagebrush scablands to the ponderosa pine forests of the foothills.
Origin: Native
Flowers: May-July
Twisted suncup (Camissonia contorta)
Distribution: Along the coast and along the Columbia and Snake Rivers in Washington; British Columbia south to Baja California, east to the Rocky Mountains.
Habitat: Sandy soil along the coast and along inland rivers.
Origin: Native
Flowers: April-June
English sundew (Drosera anglica)
Distribution: In scattered localities on both sides of the Cascades; Alaska south to the Sierra Nevada of California, east to the Great Lakes region and eastern Canada.
Habitat: Bogs and swamps.
Origin: Native
Flowers: June-August
Giant sundew (Drosera anglica)
Distribution: In scattered localities on both sides of the Cascades; Alaska south to the Sierra Nevada of California, east to the Great Lakes region and eastern Canada.
Habitat: Bogs and swamps.
Origin: Native
Flowers: June-August
Round-leaf sundew (Drosera rotundifolia)
Distribution: Chiefly west of the Cascades in Washington, but also in scattered localities east of the Cascades crest; Alaska to California, east across Montana and North Dakota, and most of the United states east of the Mississipps River.
Habitat: Swamps and bogs, lowlands to mid-elevations in the mountains.
Origin: Native
Flowers: June-September
Common sunflower (Helianthus annuus)
Distribution: Occurring chiefly east of the Cascades in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other open areas, often where disturbed, at low to middle elevations.
Origin: Native and introduced populations in Washington
Flowers: June-September
Cusick's sunflower (Helianthus cusickii)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Idaho and Nevada.
Habitat: Sagebrush, grasslands, dry slopes, and other open areas at low to middle elevations.
Origin: Native
Flowers: April-August
Nuttall's sunflower (Helianthus nuttallii)
Distribution: Chiefly east of the Cascades: Western and Mid-western United States and adjacent Canada
Habitat: Meadows and other moist places, low to moderate elevations in the mountains
Origin: Native
Flowers: July - September
Prairie sunflower (Helianthus petiolaris)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Atlantic Coast.
Habitat: Dry, open areas, often where disturbed.
Origin: Introduced from the Great Plains
Flowers: June-September
Smooth dwarf sunflower (Wyethia amplexicaulis)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Nevada, east to the Rocky Mountains.
Habitat: Seasonally moist areas in sagebrush-steppe, to open areas at moderate elevations.
Origin: Native
Flowers: May-July
Turniproot sunflower (Helianthus cusickii)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Idaho and Nevada.
Habitat: Sagebrush, grasslands, dry slopes, and other open areas at low to middle elevations.
Origin: Native
Flowers: April-August
Oregon sunshine (Eriophyllum lanatum)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana, Wyoming, and Utah.
Habitat: Dry, open, often rocky areas at low elevations to the subalpine.
Origin: Native
Flowers: May-August
Scouler's surf-grass (Phyllospadix scouleri)
Distribution: Occurring along the coast of Washington where rocky; Alaska to California.
Habitat: Rocky intertidal and sub-tidal zones.
Origin: Native
Flowers: May-August
Toothed surf-grass (Phyllospadix serrulatus)
Distribution: Occurring along the rocky coastline of northwestern Washington; Alaska to Washington.
Habitat: On rocks in upper tidal to subtidal zones, rarely on deep clay substrates.
Origin: Native
Flowers: May-September
Torrey's surf-grass (Phyllospadix torreyi)
Distribution: Occurring along the rocky coastline of northwestern Washington; British Columbia to California along the immediate coast.
Habitat: Rocky sub-tidal zone.
Origin: Native
Flowers: May-September
Alkali swainsonpea (Sphaerophysa salsula)
Distribution: Occurring east of the Cascades in Washington, chiefly in the central part of the state; Washington to California, east to the Great Plains.
Habitat: Alkaline soil at low elevations, often where disturbed.
Origin: Introduced
Flowers: May-July
Swampcandles (Lysimachia terrestris)
Distribution: Along the coast in Washington; British Columbia south to Oregon and Idaho; native and abundant in central and eastern North America.
Habitat: Cultivated cranberry bogs, and swamps.
Origin: Introduced from eastern North America
Flowers: June-August
Sweet-after-death (Achlys triphylla)
Distribution: Both sides of the Cascades in Washington; British Columbia south to California.
Habitat: Moist areas in deep woods to forest openings.
Origin: Native
Flowers: April-July
Blunt-fruit sweet-cicely (Osmorhiza depauperata)
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Forest understory and edge, often where moist from low to middle elevations.
Origin: Native
Flowers: May-July
Mountain sweet-cicely (Osmorhiza berteroi)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern Alaska to California, east to the Rocky Mountains, Great Lakes region, and eastern North America.
Habitat: Forest understory and edge, from near sea level to middle elevations in the mountains.
Origin: Native
Flowers: April-July
Purple sweet-cicely (Osmorhiza purpurea)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Idaho, and Montana.
Habitat: Moist forest openings, understory, and edge from low to middle elevations in the mountains.
Origin: Native
Flowers: June-July
Sierran sweet-cicely (Osmorhiza occidentalis)
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains from Alberta to Utah.
Habitat: Forest openings and edge, thickets, and riparian zones from low to middle elevations.
Origin: Native
Flowers: April-July
Western sweet-cicely (Osmorhiza occidentalis)
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains from Alberta to Utah.
Habitat: Forest openings and edge, thickets, and riparian zones from low to middle elevations.
Origin: Native
Flowers: April-July
Annual yellow sweet-clover (Melilotus indicus)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, east to Idaho, Utah, and Nevada, further east across the southern U.S. and in eastern North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Eurasia
Flowers: May-July
Small-flowered yellow sweet-clover (Melilotus indicus)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, east to Idaho, Utah, and Nevada, further east across the southern U.S. and in eastern North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Eurasia
Flowers: May-July
White sweet-clover (Melilotus albus)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; widely distributed across most of North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: May-October
Yellow sweet-clover (Melilotus officinalis)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; widely distributed throughout North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Eurasia
Flowers: May-September
Western sweet-vetch (Hedysarum occidentale)
Distribution: Occurring in the Olympic Mountains in Washington; British Columbia to Washington, Idaho and Utah, east to Alberta, Montana, Wyoming, and Colorado.
Habitat: Alpine and subalpine meadows.
Origin: Native
Flowers: June-August
Yellow sweet-vetch (Hedysarum sulphurescens)
Distribution: Occurring east of the Cascades crest in north-central and northeastern Washington; British Columbia to Washington, east to Alberta, Montana, and Wyoming, also reported from northeastern Oregon.
Habitat: Open forested areas.
Origin: Native
Flowers: June-August
Small-flowered sweetbrier (Rosa rubiginosa)
Distribution: Introduced chiefly west of the Cascades, and in eastern United states.
Habitat: Roadsides and pastures, occasionally in more natural areas.
Origin: Introduced
Flowers: June - July
American sweetflag (Acorus americanus)
Distribution: Very limited distribution in Washington along eastern border with Idaho; widely distributed throughout northern half of North America from Alaska to Newfoundland.
Habitat: Wetlands, lake margins, and riparian zones.
Origin: Native
Flowers: May-July
Several-vein sweetflag (Acorus americanus)
Distribution: Very limited distribution in Washington along eastern border with Idaho; widely distributed throughout northern half of North America from Alaska to Newfoundland.
Habitat: Wetlands, lake margins, and riparian zones.
Origin: Native
Flowers: May-July
Sweetgale (Myrica gale)
Distribution: Occurring west of the Cascades crest in Washington; Alaska to Oregon, east across Canada to the Great Lakes region and northeastern North America.
Habitat: Coastal bogs, swamps, lakes, and streams.
Origin: Native
Flowers: April-June
California sweetgrass (Hierochloe occidentalis)
Origin: Native
Hairy sweetgrass (Hierochloe odorata)
Distribution: Occurring in scattered locations across Washington; Alaska south to Washington, east across the northern half of North America to the Atlantic Coast.
Habitat: Wet meadows and marshes.
Origin: Native
Flowers: May-June
Alpine bog swertia (Swertia perennis)
Distribution: Narrowly distributed in Cascades of Washington; Alaska south to California, east through the Rocky Mountains.
Habitat: Streambanks, wet meadows and other moist places, mid- to high elevations in the mountains.
Origin: Native
Flowers: July-August
Swertia (Swertia perennis)
Distribution: Narrowly distributed in Cascades of Washington; Alaska south to California, east through the Rocky Mountains.
Habitat: Streambanks, wet meadows and other moist places, mid- to high elevations in the mountains.
Origin: Native
Flowers: July-August
Lesser swinecress (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
Imbricate sword-fern (Polystichum imbricans)
Distribution: Cascades of central Washington south to California, and in the Olympics; sometimes on serpentine
Habitat: Dry, rocky places, open areas and open woods, at mid-elevations
Origin: Native
Rock sword-fern (Polystichum imbricans)
Distribution: Cascades of central Washington south to California, and in the Olympics; sometimes on serpentine
Habitat: Dry, rocky places, open areas and open woods, at mid-elevations
Origin: Native
Sycamore (Platanus occidentalis)
Distribution: Occurring along the shores of the Columbia River in central and south-central Washington; common and native in central and eastern North America.
Habitat: Near streams, lakes, and moist ravines, often where disturbed.
Origin: Introduced
Flowers: April-May