Cyperus iria L.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Cyperaceae
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Scientific Name
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Description
Species Description - Tufted annual to 6 dm, with rather short, basally disposed lvs; rays usually well developed and commonly branched at the top; spikes loose and open, 1–2 cm, bearing several rather distant, ascending spikelets; spikelets 10–20-fld, to 1 cm; rachilla persistent; scales broadly obovate, rounded-emarginate, scarcely mucronate, 1.2–1.7 mm, with green midrib and golden-brown sides; rachilla wingless; stamens 2 or 3; achenes trigonous, 1–1.5 mm, blackish. Swamps and muddy ground; native of Eurasia, intr. in se. U.S. as far n. as s. Ill., Ky. and se. Va.