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Cyperus eragrostis Lam.  
Family: Cyperaceae
tall flatsedge
[Cyperus vegetus Willd., nom. superfl.]
Cyperus eragrostis image
Max Licher  
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Gordon C. Tucker*, Brian G. Marcks* & J. Richard Carter * in Flora of North America (vol. 23)
Herbs, perennial, cespitose, rhizomatous. Culms trigonous to terete, (25-)40-60(-90) cm, glabrous. Leaves flat or V-shaped, (10-)25-50 cm × 5-8(-12) mm. Inflorescences: heads globose, (10-)20-40 mm diam.; rays (0-)3-10, 2.5-5(-12) cm; 2d order rays usually absent (when present, 0.5-1.5 cm); bracts 4-8, horizontal to ascending at 15-30°, flat (or V-shaped), 3-30(-50) cm × 1.5-8(-12) mm. Spikelets (20-)30-50(-70), oblong, compressed, 5-20 × 2.2-3 mm; floral scales (12-)20-30(-50), off-white to golden brown, basally 2-keeled, laterally ribless, ovate-deltate, 2-2.3 × 1-1.4 mm (declined 30-40º from rachilla). Flowers: stamen 1; anthers 1-1.2 mm; styles 1-1.2 mm; stigmas 0.5 mm. Achenes black or dark brown, stipitate, broadly ellipsoid, 1.2-1.4 × 0.5-0.6 mm, stipe to 0.1 mm, apex apiculate, beak 0.2-0.3 mm, surfaces puncticulate. Fruiting summer. Damp grasslands, roadsides ditches; 0-200 m; B.C.; Ala., Calif., La., Miss., N.J., Oreg., Pa., S.C., Tex., Wash.; South America; naturalized, Europe. The distributions of Cyperus eragrostis in British Columbia, Alabama, Pennsylvania, South Carolina, and Texas represent introduced populations.

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Cyperus eragrostis
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Cyperus eragrostis image
Max Licher  
Cyperus eragrostis image
Max Licher  
Cyperus eragrostis image
Liz Makings  
Cyperus eragrostis image
Liz Makings  
Cyperus eragrostis image
Cyperus eragrostis image
Liz Makings  
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NSF NEON | Open Data to Understand our Ecosystems The National Ecological Observatory Network is a major facility fully funded by the National Science Foundation. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation.