''Schoenoplectus etuberculatus'', common name Canby's bulrush, is a plant species native to the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., federal district, five ma ...

. It is reported from every state on the Gulf and Atlantic coasts from eastern

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

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, plus isolated populations in

Rhode Island Rhode Island (, like ''road'') is a state in the New England region of the Northeastern United States. It is the smallest U.S. state by area and the seventh-least populous, with slightly fewer than 1.1 million residents as of 2020, but i ...

(one population in Town of

South Kingstown South Kingstown is a town in, and the county seat of, Washington County, Rhode Island, United States. The population was 31,931 at the 2020 census. South Kingstown is the second largest town in Rhode Island by total geographic area, behind New ...

, Washington County) and

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(

Oregon County Oregon County is a county located in the southern portion of the U.S. state of Missouri. As of the 2020 census, the population was 8,635. Its county seat is Alton. The county was officially organized on February 14, 1845, and was named for ...

). It is an emergent plant growing in ponds, marshes, stream banks, etc., including in brackish water along the coast. ''Schoenoplectus etuberculatus'' is a mat-forming perennial herb spreading by means of underground rhizomes. Culms are up to 2 m (80 inches) tall, triagonal in

cross-section Cross section may refer to: * Cross section (geometry) ** Cross-sectional views in architecture & engineering 3D *Cross section (geology) * Cross section (electronics) * Radar cross section, measure of detectability * Cross section (physics) **Ab ...

. Leaves are up to 20 cm (8 inches) long. Inflorescence is branched 2 or 3 times, bearing spikelets that are red, orange or straw-colored. Achenes are egg-shaped, about 4 mm (about 0.16 inches)across.Kuntze, Carl Ernst Otto. 1891. Revisio Generum Plantarum 2: 757.
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References

etuberculatus Flora of the United States Plants described in 1855 {{Cyperaceae-stub