Cyperus pennatiformis is a rare species of sedge known by the common name coastal flatsedge. It is endemic to Hawaii, where it grows on the islands of Maui, Kauai, and Laysan. It is a federally listed endangered species of the United States.
Scirpus ancistrochaetus is a rare species of flowering plant in the sedge family known by the common names barbedbristle bulrush and northeastern bulrush. It is native to the northeastern United States from New Hampshire south to Virginia. It used to be found in Quebec but it is now thought to be extirpated there. It was also believed extirpated from the state of New York, but at least one population has been rediscovered in Steuben County in 2010. It is threatened by the loss and degradation of its wetland habitat. It is a federally listed endangered species.
Carex cumulata, common names clustered sedge, piled sedge, and piled-up sedge is a species of Carex native to North America. It is a perennial.
Carex reznicekii, known as Reznicek's sedge, is a species of Carex native to North America. It is a perennial.
Carex collinsii, common name Collins' sedge, is a species of Carex native to North America. It is listed as a special concern species and believed extirpated in Connecticut. It is listed as endangered in New York, as threatened in Pennsylvania, and its historical range included Rhode Island.
Carex crawfordii, common name Crawford sedge, is a species of Carex native to North America.
Carex davisii, known as Davis' sedge or awned graceful sedge, is a species of Carex native to North America. It is listed as an endangered, threatened, or species of concern across much of edge of its range. It was named in the 1820s by Lewis David de Schweinitz and John Torrey in honor of Emerson Davis (1798–1866), a Massachusetts educator and "enthusiastic student of the genus" Carex.
Carex formosa, sometimes called handsome sedge, is a species of sedge that is native to North America. It is listed as an endangered species in Minnesota, New Jersey, and Pennsylvania, as threatened in Connecticut, Massachusetts, New York, and Wisconsin, and as presumed extirpated in Ohio.
Carex hitchcockiana, common name Hitchcock's sedge, is a Carex species that is native to North America. It is listed as endangered in Maryland, as threatened in New York and Tennessee, and as a species of special concern in Connecticut and Massachusetts.
Carex magellanica, or the boreal bog sedge, is a Carex species that is native to North America. It is listed as endangered in Connecticut.
Carex novae-angliae, the New England sedge, is a Carex species that is native to North America.
Carex oligocarpa, common name richwoods sedge, eastern few-fruited sedge, few-fruit sedge, and few-fruited sedge is a Carex species that is native to North America. It is a perennial.
Carex oligosperma, common name fewseed sedge, few-seeded sedge, and few-fruited sedge, is a perennial plant in the Carex genus. A distinct variety, Carex oligosperma var. oligosperma, exists.
Carex polymorpha common names variable sedge and many forms sedge, is a perennial species of Carex native to North America.
Carex prairea, common name prairie sedge, is a species of Carex native to North America. It is a perennial.
Carex schweinitzii, common name Schweinitz's sedge, is a Carex species native to North America. It is a perennial.
Carex sterilis, common names dioecious sedge, sterile sedge and Atlantic sedge, is a perennial plant native to North America.
Carex typhina, common name cattail sedge, is a species of Carex native to North America.
Carex viridula, known as little green sedge, green sedge, or greenish sedge, is a small flowering plant native to North America, Europe, Asia, and Morocco.
Carex willdenowii, common name Willdenow's sedge, is a species of Carex native to North America.
