Cyperus rotundus

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5418390
Taxonomy
Kingdom: Plantae
Phylum: Magnoliophyta
Class: Liliopsida
Order: Cyperales
Family: Cyperaceae
Genus: Cyperus
Species: rotundus
Scientific Name
Cyperus rotundus
L.
Common Names

purple nutsedge, nutgrass, chaguan humatag, cocograss, kili'o'opu, pakopako, purple nutsedge

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.

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