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Rice Flat Sedge Cyperus iria

Other plants called Rice Flat Sedge:

Previously known as:

  • Chlorocyperus iria
  • C. microlepis
  • C. panicoides
  • C. santonici
  • Cyperus microiria
This plant is an invasive species in North Carolina
Description

Ricefield flatsedge is a tufted, tropical annual or perennial sedge in the Cyperaceae family.  Native to tropical and subtropical locations, it is commonly found growing in the southeastern US in areas of marshes, swamps, ditches, and low wasteland.  It can be found growing in rice paddies and other wet places around the world in tropical locations and is a major weed in rice, cotton, soybean and other crops. In native conditions, it can flower year round, in US locations, it will flower in the summer and fall.  

Its flowers are each encased in two glumes, a membrane that surrounds the flowers of a sedge.  

Multiplies rapidly by the 3,000 to 5,000 seeds produced on each plant.  It has the ability to establish a second generation of plants in a single season. 

It has numerous, fibrous, yellow-red short roots.

Management of this weedy plant can be done by hand, preforming weeding prior to the flowering and the production of seed.  It can also be controlled chemically.

See this plant in the following landscape:
Cultivars / Varieties:
Tags:
#invasive#weeds#weedy#sedge#herbaceous#bushy#warm climates#grass-like#herbaceous annual#warm season weed#host plant#tropical#grass#crop weed#weed#tufted
 
Cultivars / Varieties:
Tags:
#invasive#weeds#weedy#sedge#herbaceous#bushy#warm climates#grass-like#herbaceous annual#warm season weed#host plant#tropical#grass#crop weed#weed#tufted
  • Attributes:
    Genus:
    Cyperus
    Species:
    iria
    Family:
    Cyperaceae
    Life Cycle:
    Annual
    Perennial
    Recommended Propagation Strategy:
    Seed
    Country Or Region Of Origin:
    Tropical and Subtropical Asia and old world
    Distribution:
    Worldwide
    Wildlife Value:
    A host plant to a wide variety of insects.
    Play Value:
    Wildlife Larval Host
  • Whole Plant Traits:
    Plant Type:
    Annual
    Perennial
    Weed
    Habit/Form:
    Clumping
    Erect
    Growth Rate:
    Rapid
    Maintenance:
    High
    Texture:
    Coarse
  • Cultural Conditions:
    Light:
    Full sun (6 or more hours of direct sunlight a day)
    Soil Texture:
    Clay
    Loam (Silt)
    Sand
    Soil pH:
    Acid (<6.0)
    Neutral (6.0-8.0)
    Soil Drainage:
    Moist
    Occasionally Wet
    Available Space To Plant:
    Less than 12 inches
    NC Region:
    Coastal
    Mountains
    Piedmont
    USDA Plant Hardiness Zone:
    4a, 4b, 5b, 5a, 6b, 6a, 7b, 7a, 8a, 8b, 9b, 9a
  • Fruit:
    Fruit Color:
    Brown/Copper
    Fruit Type:
    Achene
    Nut
    Fruit Length:
    < 1 inch
    Fruit Width:
    < 1 inch
    Fruit Description:
    The fruit is an shiny, obovoid, brown achene having three sides.
  • Flowers:
    Flower Color:
    Gold/Yellow
    Green
    Flower Inflorescence:
    Spike
    Umbel
    Flower Bloom Time:
    Fall
    Spring
    Summer
    Winter
    Flower Size:
    < 1 inch
    Flower Description:
    Flowers are produced in open, compound umbels on spikes that are subtended by 4-7 leaf-like bracts. The spikes are golden-brown in color, usually sessile, elongated and golden to yellowish-green.
  • Leaves:
    Leaf Color:
    Brown/Copper
    Green
    Red/Burgundy
    Leaf Feel:
    Glossy
    Rough
    Leaf Type:
    Sheath
    Simple
    Leaf Arrangement:
    Alternate
    Leaf Shape:
    Lanceolate
    Linear
    Leaf Margin:
    Entire
    Hairs Present:
    No
    Leaf Length:
    3-6 inches
    Leaf Width:
    < 1 inch
    Leaf Description:
    The flat, lance-linear green leaves are scabrid (rough) on the margins and mid-rib (having small, sharp projections) and V-shaped. The leaf sheath is reddish-brown and wraps around the stem. The leaf sheaths are green, shorter than the stem and surround the stem at the base.
  • Stem:
    Stem Color:
    Green
    Stem Is Aromatic:
    No
    Stem Cross Section:
    Angular
    Stem Form:
    Straight
    Stem Surface:
    Smooth (glabrous)
    Stem Description:
    Roughly triangular, solid, green stem or culms.
  • Landscape:
    Landscape Location:
    Pond
    Resistance To Challenges:
    Wet Soil
    Problems:
    Invasive Species
    Weedy