BugwoodWiki Article

purple nutsedge
Cyperus rotundus L.

Overview

Appearance
Cyperus rotundus is a perennial which rarely reproduces by seed but extensively reproduces by rhizomes which initially are white and fleshy with scale leaves, later becoming ligneous or "wiry."
Foliage
The leaves are three-ranked, shiny, dark green, and corrugated in cross section. They are 0.24-0.39 in. (6-10 mm) wide and 3.9-13.8 in. (10-35 cm) long. The rachis, which grows through the center of the leaf bundle, is erect, simple, smooth, triangular in cross section, and 3.9-23.6 in. (10-60 cm) long.
Flowers
Near the ends are clusters of narrow spikelets, 0.3-1 in. (0.8-2.5 cm) long and 0.07 in. (2 mm) wide, 10- to 40-flowered, acute and compressed with a red, reddish-brown, or purplish-brown color.
Fruit
Fruits are 3 angled achene.
Ecological Threat
Infests crop production areas in tropical and temperate climates, causing large losses in crop yields.

Selected Images


1117022
1117022

purple nutsedge
Cyperus rotundus
Plant(s)
Charles T. Bryson
1117024
1117024

purple nutsedge
Cyperus rotundus
Flower(s)
Charles T. Bryson
1117025
1117025

purple nutsedge
Cyperus rotundus
Flower(s)
Charles T. Bryson
1117026
1117026

purple nutsedge
Cyperus rotundus
Plant(s)
Charles T. Bryson
1120314
1120314

purple nutsedge
Cyperus rotundus
Flower(s)
James H. Miller
1624072
1624072

purple nutsedge
Cyperus rotundus
Infestation
Charles T. Bryson
5342060
5342060

purple nutsedge
Cyperus rotundus
Plant(s)
Joseph LaForest
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5374954

purple nutsedge
Cyperus rotundus
Flower(s)
Joseph M. DiTomaso

Maps


EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

EDDMapS Distribution

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit Invasive.org

State Regulated List

Most Troublesome / Most Common Agricultural Weed List
This map identifies those states that consider this species either most troublesome or most common in at least one commodity. For more information, visit the MTMC project page.

State Regulated List
Legend
   No Data for this state
   Troublesome or Common weed in one or more crops

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Liliopsida
Subclass: Commelinidae
Order: Cyperales
Family: Cyperaceae
Genus: Cyperus

Other System Links

Plants: CYRO
Bayer: CYPRO
GRIN: 316644
ITIS: 39900
NPDN Pest: PBMADBM

Synonyms and Other Names

Other Common Names:
nutgrass, chaguan humatag, cocograss, kili'o'opu, pakopako, purple nutsedge

Categories

Category: Grass or Grasslike