Scientific Name: Cyperus iria

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  • Pronunciation:
    sigh-PUR-us
  • Common Name:
    Rice Flatsedge
  • Type:
    sedge tufted annual herb , or occasionally perennial
  • Family:
    CYPERACEAE
  • Flowers:
    Inflorescence: simple or compound umbel composed of numerous erect-spreading 3—10—mm—long flattened spikelets.
  • Fruit:
    Fruit: three-angled, 1.0—1.5—mm nut with slightly concave sides, and shiny dark brown to black.
  • Vegetation Type:
    Freshwater wetlands
  • Species List:
    Cooroy Mill Site, SRR, Cranks Creek,
Cultural Notes

Cosmopolitan annual and a weed in Asia in rice paddys.

Identification Notes

fibrous roots, 15—75 yellowish red roots; Stem: sharply 3 angled, tufted, smooth, 5—80—cm high. Leaf: basal, rough to touch in upper part, linear, flaccid, with gradually tapering point and 3—8—mm wide; sheath reddish or purplish brown, enveloping the stem at base. **Identifying features - Cyperus sp** Culms: Triangular to cylindrical. Inflorescence: Terminal, head-like or umbel-like, simple or compound rays. Involucral bracts: Under each ray, mostly leaf-like. Leaves: Grass-like or reduced to sheathing scales.