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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.
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. Seedlings are grasslike and rather inconspicuous.
Leafless stems end in egg-shaped
clusters of flowers subtended by three to five bracts. Very hard at maturity,
the tubers 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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