deeprooted sedge USDA PLANTS Symbol: CYEN2
U.S. Nativity: Exotic
Habit: Grass or Grasslike Aquatic Plants
Cyperus entrerianus Boeckl.

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Taxonomic Rank: Liliopsida: Cyperales: Cyperaceae
Synonym(s): woodrush flatsedge

Appearance
Cyperus entrerianus is a wetland sedge that invades disturbed areas throughout the southeastern United States. It is a robust, up to 40 in. (1.02 m) tall, grass-like plant with deeply set, thick rhizomes and dark purple to black leaf bases.
Foliage
The leaves are basal, glossy, and flat or V-shaped. One of the identifying characteristics are the dark purple to black leaf bases.
Flowers
The terminal inflorescence has 5-11 elongate rays ending in densely clustered, globose, greenish-white spikelets. The stem is distinctly three sided.
Fruit
Fruits are brown achenes. Large plants can produce a million viable seeds a year. It also reproduces vegetatively through fragmentation and budding of rhizomes.
Ecological Threat
Cyperus entrerianus can invade wet undisturbed natural habitats as well as disturbed areas such as highway ditches and field margins. It can form monocultures, displacing native vegetation in habitats it invades. Construction, agricultural activities, and roadside mowing are spreading the seeds and dispersing this plant to new areas. It is tolerant of a wide range of soil types from sand to clay. Cyperus entrerianus is native to South America and was accidentally introduced into the United States around 1990. It invades disturbed areas through-out the southeastern United States.

Identification, Biology, Control and Management Resources

Selected Images from Invasive.orgView All Images at Invasive.org


Plant(s);
Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org
Additional Resolutions & Image Usage

Feature(s); Competing with cogongrass
Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org
Additional Resolutions & Image Usage

Infestation; Plants growing in ditch along Hwy. GA 94, flatwoods, Echols County, Georgia, U.S.A.
Richard Carter, Valdosta State University, Bugwood.org
Additional Resolutions & Image Usage

Infestation; Plants growing in ditch along Hwy. GA 94, flatwoods, Echols County, Georgia, U.S.A.
Richard Carter, Valdosta State University, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Richard Carter, Valdosta State University, Bugwood.org
Additional Resolutions & Image Usage

EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
 


State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.


Invasive Listing Sources:
South Carolina Exotic Pest Plant Council