UW Burke Herbarium species comparison

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Cyperus difformis

Cyperus eragrostis

tall flatsedge
Habit Tufted, herbaceous perennial from rhizomes, the culms terete to triangular, 40-60 cm. tall, glabrous.
Leaves

Leaves flat or v-shaped, 25-50 cm. long and 5-8 mm. wide.
Flowers

Inflorescence of globose heads 20-40 mm. in diameter;

rays 3-10, 2.5-5 cm. long;

bracts 4-8, horizontal to ascending, usually flat;

spikelets 30-50, oblong, compressed;

scales 20-30, off-white to golden brown, ovate-deltate, 2-2.3 mm. long;

stamen 1;

styles 1-1.2 mm. long.
Fruits

Achenes dark brown to black, broadly ellipsoid, 1.2-1.4 mm. long, with a beak up to 0.3 mm. long.

Cyperus difformis

Cyperus eragrostis
Flowering time June-August
Habitat Damp to wet shores, ditches, roadsides, and other disturbed areas at low elevations.
Distribution
[WildflowerSearch map]
[BONAP county map]
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.
[WildflowerSearch map]
[BONAP county map]
Origin Introduced from South America
Conservation status Not of concern
Sibling taxa
C. acuminatus, C. bipartitus, C. diandrus, C. eragrostis, C. erythrorhizos, C. esculentus, C. fuscus, C. lupulinus, C. lupulinus × C. schweinitzii, C. schweinitzii, C. squarrosus, C. strigosus
C. acuminatus, C. bipartitus, C. diandrus, C. erythrorhizos, C. esculentus, C. fuscus, C. lupulinus, C. lupulinus × C. schweinitzii, C. schweinitzii, C. squarrosus, C. strigosus
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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