Cyperaceae
Sedge Family
14 genera
204 species
28 subspecies and varieties
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Scientific name
Common name
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Amphiscirpus nevadensisNevada bulrush
Origin: Native
Bolboschoenus fluviatilisriver bulrush
Origin: Native
Bolboschoenus maritimusseacoast tuberous bulrush
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east across much of North America; cosmopolitan.
Habitat: Salt marshes, wet meadows, and margins of ponds, especially in alkaline or saline areas.
Origin: Native
Flowers: June-September
ssp. paludosus – saltmarsh bulrush, seacoast bulrush
Carex abruptaabrupt-beaked sedge
Origin: Native
Carex agastachys
Origin: Introduced
Carex albonigrablack-and-white-scaled sedge
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
Carex amplifoliabig-leaf sedge
Distribution: British Columbia to California, east to Idaho and the Steens Mountains of Oregon
Habitat: Swamps, bogs and other wet places, lowlands to moderate elevations in the mountains
Origin: Native
Flowers: Late May - July
Carex angustatamany-fruit sedge, wide-fruited sedge
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
Carex anthoxantheagrassy-slope arctic sedge, yellow-flowered sedge
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
Carex apertaColumbia sedge
Origin: Native
Flowers: April - August
Carex aquatilis
Distribution: Circumboreal at high latitudes; east of the Cascades in Washington and Oregon
Habitat: Standing water or saturated soil, foothills to near timberline in the mountains
Origin: Native
Flowers: June - August
var. aquatilis – water sedge
var. dives – Sitka sedge
Carex arctanorthern clustered sedge
Origin: Native
Flowers: June - August
Carex atherodesawned sedge, wheat sedge
Origin: Native
Flowers: June - August
Carex athrostachyaslender-beak sedge
Origin: Native
Flowers: May - August
Carex atrosquamablack-scale sedge
Origin: Native
Flowers: July - August
Carex aureagolden sedge, pumpkin sedge
Distribution: Across Canada, south to California and Pennsylvania
Habitat: Moist or wet places from the lowlands to near timberline in the mountains
Origin: Native
Flowers: April - August
Carex backiiBack's sedge
Origin: Native
Carex bebbiiBebb's sedge
Origin: Native
Flowers: May - August
Carex bolanderiBolander's sedge
Origin: Native
Carex breviorPlains oval sedge, short-beaked sedge
Origin: Native
Flowers: May - July
Carex breweriBrewer's sedge
Distribution: In the Olympic and Cascade Mountains of Washington; Washington south to California, east to Nevada.
Habitat: Open slopes, ridges, and rocky areas of the subalpine and alpine.
Origin: Native
Flowers: July-August
Carex brunnescensbrown sedge
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
ssp. brunnescens – brownish sedge
Carex buchananiisilver-spiked sedge
Origin: Introduced
Carex buxbaumiibrown bog sedge, Buxbaum's sedge
Origin: Native
Flowers: June - August
Carex californicaCalifornia sedge
Origin: Native
Flowers: May - August
Carex canescenssilvery sedge
Origin: Native
Flowers: June - August
ssp. canescens – grey sedge, silvery sedge
Carex capillarishair sedge
Origin: Native
Flowers: June - August
Carex capitatacapitate sedge
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
Carex chordorrhizacordroot sedge, creeping sedge, rope-root sedge
Origin: Native
Carex circinatacoiled sedge
Origin: Native
Flowers: June - August
Carex comosabearded sedge, bristly sedge
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
Carex concinnoidesnorthwestern sedge, tetrastigmatic sedge
Origin: Native
Flowers: April - July
Carex cordilleranacordilleran sedge
Origin: Native
Carex craweiCrawe's sedge
Origin: Native
Flowers: May - July
Carex crawfordiiCrawford's sedge
Origin: Native
Flowers: June - August
Carex cusickiiCusick's sedge
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
Carex davyiConstance's sedge, Davy's sedge
Origin: Native
Carex deflexamountain mat sedge
Origin: Native
var. boottii – northern sedge
Carex densadense sedge
Origin: Native
Flowers: April - June
Carex deweyanadewey's sedge
Origin: Native
Flowers: May - July
var. deweyana – Dewey's sedge
Carex diandralesser panicled sedge, lesser tussock sedge
Origin: Native
Flowers: June - July
Carex dispermashort-leaf sedge
Origin: Native
Flowers: June - August
Carex divulsaLeers's sedge
Origin: Introduced
Carex douglasiiDouglas' sedge
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
Carex eburneabristle-leaved sedge
Origin: Native
Carex echinata
Distribution: Circumboreal, south to North Carolina and, in the mountains, to California
Habitat: Swamps, bogs and other wet places, lowlands to moderate elevations in the mountains
Origin: Native
ssp. echinata – star sedge
ssp. phyllomanica – coastal star sedge
Carex engelmanniiMt. Adams sedge
Origin: Native
Flowers: July - August
Carex exsiccatabig inflated sedge
Origin: Native
Flowers: June - August
Carex fetagreen-sheath sedge
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
Carex filifoliathread-leaved sedge
Origin: Native
Flowers: April - July
var. filifolia – thread-leaf sedge
Carex flavayellow sedge, yellow-green sedge
Origin: Native
Flowers: June - August
Carex fractafragile-sheath sedge
Origin: Native
Flowers: June - August
Carex geyerielk sedge, Geyer's sedge
Distribution: East of the Cascades, British Columbia to California, east to Colorado
Habitat: Open woodlands and dry meadows, foothills to moderate elevations in the mountains
Origin: Native
Flowers: April - July
Carex gynocratesnorthern bog sedge
Origin: Native
Flowers: June - August
Carex hallianaHall's sedge
Origin: Native
Flowers: June - August
Carex hasseifalse golden sedge
Origin: Native
Carex haydenianacloud sedge, Hayden's sedge
Origin: Native
Flowers: June - August
Carex hendersoniiHenderson's sedge
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
Carex heteroneuradifferent-veined sedge, smooth-fruited sedge
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
Carex hoodiiHood's sedge
Origin: Native
Flowers: May - June
Carex hystericinaporcupine sedge
Origin: Native
Flowers: May - June
Carex illotasmall-head sedge
Origin: Native
Flowers: June - August
Carex infirminerviaweak-veined sedge
Origin: Native
Carex inopslong-stolon sedge
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
ssp. inops – long-stolon sedge
Carex integrasmooth-beaked sedge
Origin: Native
Carex interiorinland sedge
Origin: Native
Flowers: May - July
Carex interruptagreen-fruited sedge, interrupted sedge
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
Carex jonesiiJones' sedge
Origin: Native
Flowers: June - August
Carex kelloggii
Distribution: Across Canada, south to California (in the mountains) and Massachusetts
Habitat: Wet meadows and streambanks, sea level to near timberline
Origin: Native
Flowers: May - August
var. impressa – few-ribbed sedge
var. kelloggii – Kellogg's sedge, lakeshore sedge
var. limnophila – lakeshore sedge
Carex kobomugiJapanese sedge
Origin: Introduced
Carex lacustrislake sedge
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
Carex laeviculmissmooth-stemmed sedge
Origin: Native
Flowers: June - August
Carex lasiocarpawiregrass
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to Idaho and Montana in our area; also throughout northeastern North America.
Habitat: Wet meadows, bogs, fens, streambanks, and lakeshores where sometimes forming floating mats.
Origin: Native
Flowers: May-September
Carex leporinaoval broom sedge
Origin: Native
Carex leporinellaSierra hare sedge
Origin: Native
Flowers: July - August
Carex leptaleadelicate sedge, jelly bean sedge
Origin: Native
Flowers: May - August
Carex leptopodashort-scaled sedge, slenderfoot sedge
Origin: Native
Carex limosamud sedge
Origin: Native
Flowers: June - August
Carex lividalivid sedge, pale sedge
Origin: Native
Flowers: May - July
Carex longiiLong's sedge
Origin: Introduced
Carex luzulinaspring sedge, woodrush sedge
Origin: Native
Flowers: June - August
Carex lyngbyeiLyngbye's sedge
Distribution: Circumboreal along the seacoasts; south to northern California in our area
Habitat: Coastal marches and tidal flats
Origin: Native
Flowers: April - July
Carex maclovianaFalkland Island sedge
Origin: Native
Carex macrocephalabighead sedge
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
Carex macrochaetaAlaska long-awn sedge
Origin: Native
Flowers: June - August
Carex magellanicaboreal bog sedge, poor sedge
Origin: Native
ssp. irrigua – poor sedge
Carex mediaMontana sedge, Scandinavian sedge
Origin: Native
Carex mertensiiMertens' sedge
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
Carex micropodatimberline sedge
Origin: Native
Carex micropterasmall-winged sedge
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
Carex nardinaspikenard sedge
Distribution: In the Olympics and Cascades of Washington;
Habitat: Alpine rocky outcroppings, slopes, and ridges.
Origin: Native
Flowers: June-August
Carex nebrascensisNebraska sedge
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
Carex neurophoraalpine nerve sedge
Origin: Native
Flowers: July - August
Carex nigricansblack alpine sedge
Origin: Native
Flowers: June - August
Carex nudatatorrent sedge
Origin: Native
Flowers: May - June
Carex obnuptaslough sedge
Distribution: West of the Cascades, British Columbia to California
Habitat: Standing water or saturated soil, coastal swamps and along rivers
Origin: Native
Flowers: April - July
Carex obtusatablunt sedge
Origin: Native
Flowers: May - July
Carex pachycarpafurrowed broomsedge
Origin: Native
Flowers: June - August
Carex pachystachyathick-head sedge
Origin: Native
Flowers: May - August
Carex pallescenspale green sedge
Origin: Introduced
Carex pansasand sedge
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
Carex pauciflorafew-flowered edge
Distribution: Near the coast, Alaska to northern Washington, and in northeastern United States
Habitat: Bogs
Origin: Native
Flowers: June - July
Carex pellitawoolly sedge
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
Carex pendulapendulous sedge
Origin: Introduced
Carex petasataLiddon's sedge
Origin: Native
Flowers: May - July
Carex phaeocephalamountain hare sedge
Origin: Native
Flowers: June - August
Carex pluriflorablack bog sedge
Origin: Native
Flowers: June - July
Carex praeceptorumteacher's sedge
Origin: Native
Flowers: July - August
Carex praegracilisclustered field sedge
Origin: Native
Flowers: May - August
Carex praticolanorthern meadow sedge
Origin: Native
Flowers: May - August
Carex presliiPresl's sedge
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
Carex propositaSmoky Mountain sedge
Origin: Native
Flowers: July - August
Carex raynoldsiiRaynolds' sedge
Origin: Native
Flowers: June - August
Carex retrorsaretrorse sedge
Origin: Native
Flowers: May - September
Carex rossiiRoss' sedge
Origin: Native
Flowers: May - August
Carex rostratanorthern beaked sedge
Distribution: Alaska to Washington, east to Montana, and in the Great Lakes region
Habitat: Sphagnum bogs
Origin: Native
Flowers: June - August
Carex saxatilislimestone sedge, russet sedge
Origin: Native
Flowers: June - August
Carex scirpoideasingle-spike sedge
Origin: Native
Flowers: June - August
ssp. pseudoscirpoidea – western single-spiked sedge
ssp. scirpoidea – northern single-spike sedge
ssp. stenochlaena – Alaska singlespike sedge
Carex scopariapointed broomsedge
Origin: Native
Flowers: June - July
Carex scopulorum
Origin: Native
Flowers: June - August
var. bracteosa – Sierra alpine sedge
var. prionophyllum – firethread sedge
Carex sheldoniiSheldon's sedge
Origin: Native
Carex siccatadry-spike sedge
Origin: Native
Flowers: May - July
Carex simulataanalogue sedge
Origin: Native
Flowers: May - August
Carex spectabilisshowy sedge
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
Carex stenoptilariverbank sedge
Origin: Native
Carex stipata
Distribution: Alaska, Canada and most of the United states
Habitat: Wet ground, lowlands (especially west of the Cascades) to mid-elevations in the mountains
Origin: Native
Flowers: May - August
var. stipata – awl-fruited sedge, sawbeak sedge
Carex straminiformisMt. Shasta sedge
Origin: Native
Flowers: July - August
Carex stylosalong-style sedge
Distribution: Alaska to Clallam County, Washington, east across Canada to Labrador
Habitat: Usually near the coast
Origin: Native
Flowers: June - August
Carex subbracteatasmall-bracted sedge
Origin: Introduced
Carex subfuscarusty sedge
Origin: Native
Flowers: June - August
Carex sychnocephalamany-headed sedge
Origin: Native
Flowers: June - August
Carex sylvaticaEuropean woodland sedge
Origin: Introduced
Carex tahoensisLake Tahoe sedge
Origin: Native
Carex teneraquill sedge, slender sedge
Origin: Native
Flowers: May - August
Carex tenuiflorasparse-flower sedge
Origin: Native
Carex tribuloidestribulation sedge
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
var. tribuloides – blunt broom sedge
Carex tumulicolafoothill sedge
Origin: Native
Flowers: May - June
Carex unilateralisone-sided sedge
Origin: Native
Flowers: May - July
Carex utriculatabeaked sedge, inflated sedge, Northwest Territory sedge
Origin: Native
Carex vallicolavalley sedge
Origin: Native
Flowers: April - July
Carex vernaculafoetid sedge
Origin: Native
Flowers: June - August
Carex vesicariainflated sedge, oxbow sedge
Origin: Native
Flowers: June - August
Carex viridulagreen sedge
Origin: Native
ssp. viridula – greenish sedge, little green sedge
Carex vulpinoideafox sedge
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
Carex zikaeshort-stemmed sedge, Zika's sedge
Origin: Native
Cyperus acuminatussharp-pointed flatsedge, taper-tip flatsedge
Origin: Native
Cyperus bipartitusshining flatsedge
Distribution: Occurring on both sides of the Cascades crest in Washington; widespread in North America.
Habitat: Streambanks and other wet places in the valleys and lowlands; tolerant of alkali.
Origin: Native
Flowers: June-August
Cyperus diandrusumbrella flatsedge
Origin: Introduced
Cyperus eragrostistall flatsedge
Distribution: British Columbia south to California, east to New Jersey and South Carolina.
Habitat: Damp grasslands and roadside ditches at low elevations.
Origin: Introduced
Flowers: June - August
Cyperus erythrorhizosredroot flatsedge
Distribution: Widespresd in the United Stated and adjacent Canada.
Habitat: Streambanks and other wet places in the valleys and lowlands.
Origin: Native
Flowers: June - August
Cyperus esculentusyellow nut-grass
Distribution: Widely distributed throughout Washington; widespread throughout North America.
Habitat: Moist, low ground along streams and ditches, but sometimes in drier ground.
Origin: Native
Flowers: June-August
var. leptostachyus – yellow nutgrass
Cyperus fuscusbrown galingale
Origin: Introduced
Cyperus lupulinusGreat Plains flatsedge
Distribution: Great Plains to northeastern United States; occasional in the Pacific Northwest.
Habitat: Wet areas.
Origin: Native
Flowers: June - August
ssp. lupulinus – Great Plains flatsedge
Cyperus odoratusscented flatsedge
Origin: Introduced
Cyperus schweinitziisand flatsedge
Origin: Native east Cascades, introduced in Seattle, WA
Cyperus squarrosusawned flatsedge
Distribution: Widespread in the United States and Europe.
Habitat: Wet places in the valleys and lowlands.
Origin: Native
Flowers: June - August
Cyperus strigosusfalse flatsedge, straw-colored flatsedge
Distribution: Widespread in the United States and adjacent Canada.
Habitat: Wet places, along the banks of large streams, in the valleys and lowlands.
Origin: Native
Flowers: July - September
Dulichium arundinaceumthree-way sedge
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
Eleocharis acicularisneedle spikerush
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
Eleocharis atropurpureapurple spikerush
Origin: Native
Eleocharis bellapretty spikerush
Origin: Native
Flowers: June - September
Eleocharis bolanderiBolander's spikerush
Origin: Native
Eleocharis coloradoensisdwarf spike-rush
Origin: Native
Eleocharis engelmanniiEngelman spikerush
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
Eleocharis erythropodabald spike-rush, redfoot spike-rush
Origin: Native
Eleocharis geniculatacapitate spike-rush
Origin: Native
Eleocharis macrostachyacreeping spikerush
Origin: Native
Eleocharis mamillatasoft-stem spike-rush
Origin: Native
Eleocharis obtusablunt spikerush
Origin: Native
Eleocharis ovataovoid spikerush
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
Eleocharis palustriscommon spikerush
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
Eleocharis parvulalittle-head spikerush
Distribution: Vancouver Island, British Columbia, to Newfoundland, south to northern South America.
Habitat: Wet, saline or alkaline soils.
Origin: Native
Flowers: June - September
Eleocharis quinqueflorafew-flowered spike-rush
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
Eleocharis rostellatawalking sedge, beaked spikerush
Origin: Native
Flowers: June - August
Eleocharis suksdorfianaSuksdorf spikerush
Origin: Native
Eleocharis uniglumisslender spike-rush
Origin: Native
Eriophorum angustifoliummany-spiked bog cotton, many-spiked cotton-grass
Distribution: Circumboreal at high latitudes, extending south into Oregon, Colorado and New York.
Habitat: Cold swamps and bogs at moderate to high elevations in the mountains.
Origin: Native
Flowers: July - August
ssp. angustifolium – many-spiked cottongrass
Eriophorum chamissonisChamisso's cotton-grass, russet cottongrass
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska south to Oregon, east across the northern half of North America to the Atlantic Coast.
Habitat: Swamps and other wet places at moderate elevations in the mountains, descending to sea level along the coast.
Origin: Native
Flowers: May-August
Eriophorum gracileslender cottongrass
Distribution: Alaska, Canada and the northern half on the United States
Habitat: Wet places, mid- to high elevation in the mountains
Origin: Native
Flowers: May - August
Eriophorum virginicumtawny cottongrass
Origin: Introduced
Eriophorum viridicarinatumtassel cottongrass
Origin: Native
Flowers: June - July
Isolepis cernualow clubrush, low lateral clubrush
Distribution: Coastal from Southern British Columbia south to northern Mexico.
Habitat: Usually in brackish to saline water of marshes, beaches, and shores.
Origin: Native
Flowers: June - August
Isolepis setaceaEurasian bulrush, bristle-leaf sedge
Origin: Introduced
Kobresia myosuroidesBellard's kobresia, Pacific bog sedge
Origin: Native
Flowers: June - August
Lipocarpha aristulatahalfchaff sedge
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
Lipocarpha micranthasmall-flowered halfchaff edge
Origin: Native
Flowers: June - September
Lipocarpha occidentaliswestern halfchaff sedge
Origin: Native
Flowers: June - September
Rhynchospora albawhite beakrush
Distribution: Alaska to California, east to Idaho, and throughout northeastern United states.
Habitat: Sphagnum bogs and other wet places, lowlands to mid-elevations in the mountains
Origin: Native
Flowers: July - August
Schoenoplectus acutushardstem bulrush, viscous bulrush, common tule
Distribution: Both sides of the Cascades in Washington; throughout all of North America except southeastern U.S.
Habitat: Pond and lake margins, wetland and riparian areas.
Origin: Native
Flowers: May-July
Schoenoplectus americanusOlney's three-square bulrush
Origin: Native
Schoenoplectus heterochaetusslender bulrush
Origin: Native
Schoenoplectus ×kuekenthalianusKukenthal's bulrush
Origin: Native
Schoenoplectus mucronatusricefield bulrush, rough-seed bulrush
Origin: Introduced
Schoenoplectus pungenschairmaker's clubrush, common three square
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
Schoenoplectus saximontanusRocky Mountain bulrush
Origin: Native
Schoenoplectus subterminalisswaying clubrush, water clubrush
Distribution: Chiefly west of the Cascades, southern Alaska to southern Oregon; also in northern Idaho, northwest Montana, and eastern United States.
Habitat: Quiet, shallow water 2-8 dm. deep,
Origin: Native
Flowers: July - August
Schoenoplectus tabernaemontanigreat bulrush, soft-stem bulrush
Distribution: Widespread in temperate North America; common throughout the Pacific Northwest, but less so than S. acutus.
Habitat: Marshes and muddy shores of lakes and streams at lower elevations; tolerant of alkali.
Origin: Native
Flowers: June - August
Schoenoplectus triqueterrounded three square
Origin: Introduced
Scirpus atrocinctuscommon woolly sedge
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
Scirpus cyperinuscottongrass bulrush
Distribution: Newfoundland south to Florida, occasionally west across southern Canada to southeast British Columbia and northern Washington.
Habitat: Wet, low ground.
Origin: Introduced
Flowers: July-August
Scirpus microcarpuspanicled bulrush, small fruited bulrush
Distribution: British Columbia to California, east in Canada and northern United States to New England
Habitat: Wet ground from low to moderate elevations in the mountains
Origin: Native
Flowers: June - August
Scirpus palliduspale bulrush
Distribution: Southest Washington and northeast Oregon, east to Utah, Minnisota and Texas.
Habitat: Wet, low ground, from the lowlands to moderate elevations in the mountains.
Origin: Native
Flowers: June - August
Trichophorum cespitosumtufted clubrush
Distribution: Circumboreal, extending south in North America chiefly west of the Cascades to central Oregon; also in North Carolina, Utah and Idaho.
Habitat: Sphagnum bogs, marshes, and other very wet places.
Origin: Native
Flowers: July - August