Toothed flatsedge

Cyperus dentatus, also known as toothed flatsedge, is a species of flowering plant in the sedge family Cyperaceae. It is native to eastern North America, from Nova Scotia in Canada southward to Virginia in the United States. Disjunct populations occur in western Virginia, southeastern Tennessee, and northwestern Indiana south of Lake Michigan. In the early 19th century, botanists formally described the species based on plants found on the banks of the Susquehanna River in Pennsylvania, in the pine barrens of New Jersey, and in New England. Its range was once thought to extend into the southern U.S. states of Georgia, South Carolina, and North Carolina but some botanists believe these reports may actually be based on Cyperus lecontei, a close look-alike.

The floral structures of Cyperus dentatus are said to be dentate, which means "having teeth". Both the scientific name and the common name emphasize this fact. It often produces bulb-like structures called bulblets. If a bulblet takes root, a clone of the parent plant is formed.

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