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GENERAL
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Coquillo belongs to the genus Cyperus, of which about 900 species have been documented
throughout the world. Some are grown for food, fibers, and perfume; others are considered among
the world's worst weeds.
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Two species of coquillo are found in the Ojos Negros valley:
C. esculentus L. and C. rotundus L.
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C. esculentus L. is known as
yellow nutsedge (Fig. 1).
C. rotundus L. is known as purple nutsedge
(Fig. 2).
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Nutsedges develop an extensive system of rhizomes, tubers, and roots. Rhizomes produce tubers and
basal bulbs that bear aerial roots. Tubers store starch and have several buds that produce rhizomes,
which develop more basal bulbs and new plants.
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Nutsedges occur in disturbed areas, cultivated fields, especially those irrigated in the summer;
in irrigation ditches, orchards, vineyards, gardens, turf, and landscaped areas.
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Nutsedges grow typically
where moisture is plentiful. They tolerate many soil conditions, including periods of drought and flooding.
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