3 genera
16 species, 2 subspecies and varieties
16 species, 2 subspecies and varieties
Show only taxa with photos
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Cyperus acuminatus – sharp-pointed flatsedge, taper-tip flatsedge
Origin: Native
Growth Duration: Annual, Biennial, Perennial
Origin: Native
Growth Duration: Annual, Biennial, Perennial
Cyperus bipartitus – shining 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
Growth Duration: Annual
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
Growth Duration: Annual
Cyperus eragrostis – tall flatsedge
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, also along the southern and eastern U.S. coast.
Habitat: Damp to wet shores, ditches, roadsides, and other disturbed areas at low elevations.
Origin: Introduced from South America
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, also along the southern and eastern U.S. coast.
Habitat: Damp to wet shores, ditches, roadsides, and other disturbed areas at low elevations.
Origin: Introduced from South America
Flowers: June-August
Growth Duration: Perennial
Cyperus erythrorhizos – redroot flatsedge
Distribution: Occurring on both sides of the Cascades crest in and in the Columbia River Gorge in Washington; southern British Columbia to California, east across much of North America to the Atlantic Coast.
Habitat: Pond and lake shores, streambanks, seeps, vernal pools, and ditches at low to middle elevations.
Origin: Native
Flowers: June-August
Growth Duration: Annual, Perennial
Distribution: Occurring on both sides of the Cascades crest in and in the Columbia River Gorge in Washington; southern British Columbia to California, east across much of North America to the Atlantic Coast.
Habitat: Pond and lake shores, streambanks, seeps, vernal pools, and ditches at low to middle elevations.
Origin: Native
Flowers: June-August
Growth Duration: Annual, Perennial
Cyperus esculentus – yellow nut-grass
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Moist, low ground along streams and ditches, but sometimes in drier ground.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Moist, low ground along streams and ditches, but sometimes in drier ground.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
• var. leptostachyus – yellow nutgrass
Cyperus lupulinus – Great Plains flatsedge
Distribution: Great Plains to northeastern United States; occasional in the Pacific Northwest.
Habitat: Wet areas.
Origin: Native
Flowers: June - August
Growth Duration: Perennial
Distribution: Great Plains to northeastern United States; occasional in the Pacific Northwest.
Habitat: Wet areas.
Origin: Native
Flowers: June - August
Growth Duration: Perennial
• ssp. lupulinus – Great Plains flatsedge
Cyperus schweinitzii – sand flatsedge
Distribution: Occurring in scattered locations across Washington; Washington to Utah and Alberta, east across much of North America.
Habitat: Sandy lakeshores and riverbanks.
Origin: Native east Cascades, introduced in Seattle, WA
Flowers: July-September
Growth Duration: Perennial
Distribution: Occurring in scattered locations across Washington; Washington to Utah and Alberta, east across much of North America.
Habitat: Sandy lakeshores and riverbanks.
Origin: Native east Cascades, introduced in Seattle, WA
Flowers: July-September
Growth Duration: Perennial
Cyperus squarrosus – awned flatsedge
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Lake and pond shores, banks of slow moving streams and rivers, and other wet, open areas at low to middle elevations.
Origin: Native
Flowers: June-September
Growth Duration: Annual
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Lake and pond shores, banks of slow moving streams and rivers, and other wet, open areas at low to middle elevations.
Origin: Native
Flowers: June-September
Growth Duration: Annual
Cyperus strigosus – false 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
Growth Duration: Perennial
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
Growth Duration: Perennial
Dulichium arundinaceum – three-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
Growth Duration: Perennial
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
Growth Duration: Perennial
Lipocarpha aristulata – halfchaff 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
Growth Duration: Annual
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
Growth Duration: Annual
Lipocarpha micrantha – small-flowered halfchaff sedge
Origin: Native
Flowers: June - September
Growth Duration: Annual
Origin: Native
Flowers: June - September
Growth Duration: Annual
Lipocarpha occidentalis – western halfchaff sedge
Origin: Native
Flowers: June - September
Growth Duration: Annual
Origin: Native
Flowers: June - September
Growth Duration: Annual
