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Cyperus lupulinus   (Spreng. ) Marcks
[=Cyperus filiculmis Vahl]
Saline County, Kansas
Height: 4-28 inches
Family: Cyperaceae - Sedge Family
Flowering Period:   May, June, July, August, September,October
Culms: Slender, wiry, 3-sided, glabrous.
Leaves: Blades folded together lengthwise or flat, 2 to 18 inches long, 1/25 to 1/7 inch wide, shorter than culm, margins rough, sometimes unrolled.
Inflorescences: Single head-like spike, sessile, dense, hemispherical to nearly spherical, 2/5 to 1 inch diam., rarely with 1 or 2 additional rays; subtending involucral bracts 2-4, spreading or deflexed
Spikelets: 10-70, linear to narrowly elliptic, 1/8 to 4/5 inch long, radiate, densely congested, bases overlapping, tips pointed, 3-25-flowered; scales straw-colored to light brown or nearly white, midrib green, 7-13-nerved, nerves conspicuous, oblong, 1/12 to 1/7 inch long, midrib extending past body of scale as short point; stamens 3; style 3-cleft.
Fruits: Achene, dark brown or black, narrowly oblong, .09 to .09 inch, sharply 3-angled, shiny.
Habitat: Well-drained, open roadsides, fields, and prairies.
Distribution: Statewide
Origin: Native
Comments: Cespitose. From tuberous-thickened rhizomes.

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