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DESCRIPTION:
River bulrush, a perennial sedge, occurs in drainage and irrigation canals.
It grows vegetatively from dark brown tubers that form on underground stems. Seedlings are grasslike and rather inconspicuous. It
appears early in the season in clumps and patches, distinguishing itself from ricefield
bulrush.
Generally 3 to 5 feet (90 - 150 cm) tall, this plant has the characteristic triangular
stem of the sedge family. Leafless stems end in egg-shaped flower clusters below which three to five leaflike structures
extend. Very hard at maturity, underground stem tips are difficult to cut with a pocket knife. It can be troublesome in
rice fields not rotated with other
crops. Infestations are localized but can be problems where they occur.
Sedge ID illustration.
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