Cyperus
cyperus, flatsedge
13 species
2 subspecies and varieties
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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