Northern singlespike sedge
- kingdom: Plantae
- phylum: Tracheophyta
- class: Liliopsida
- order: Poales
- family: Cyperaceae
- genus: Carex
- species: Carex scirpoidea
- Banff
- Jasper Park Lodge
Alberta- The Pas
Manitoba- Norman Wells
Northwest Territories- Clyde River
- Rankin Inlet
Nunavut- Kingston
- Little Current
- Ottawa
- Sarnia
Ontario- Charlottetown
Prince Edward Island- Châteauguay
- Gaspé
- Longueuil
- Montréal
Quebec- Prince Albert
Saskatchewan
Canada- Paamiut
Sermersooq
Greenland- Juneau
Alaska- Ledyard Center
- Middlebury
- New Haven
- Waterbury
Connecticut- Athens
Georgia- Soda Springs
Idaho- Athens
- Havana
- Palos Park
Illinois- Goshen
- Hanover
- Long Beach
- Rochester
Indiana- Auburn
- Fort Fairfield
- Lewiston
- Orono
Maine- Mountain Lake Park
Maryland- Center City
- Duluth
- Robbinsdale
Minnesota- Fitzwilliam
- Gorham
- Hampton Falls
- Peterborough
New Hampshire- Apalachin
- Baldwin
- Baldwin Harbor
- Barnum Island
- Bohemia
- Brewster Hill
- Bridgehampton
- Bronxville
- Brooklyn
- Buffalo
- Cairo
- Central Islip
- Copiague
- Crompond
- Croton-on-Hudson
- Dobbs Ferry
- East Hampton
- East Hampton North
- East Ithaca
- East New York
- East Williston
- Freeport
- Garden City
- Garden City Park
- Greenville
- Harbor Isle
- Hastings-on-Hudson
- Hempstead
- Herricks
- Highland Falls
- Island Park
- Ithaca
- Jamaica
- Lake Grove
- Lake Mohegan
- Lake Ronkonkoma
- Lindenhurst
- Long Beach
- Manhasset Hills
- Massapequa
- Massapequa Park
- Mineola
- Montauk
- Mount Vernon
- North Hills
- North Massapequa
- Oakdale
- Oriskany
- Oyster Bay
- Penn Yan
- Ronkonkoma
- Seaford
- Searingtown
- South Hill
- Staten Island
- Syracuse
- Tupper Lake
- Uniondale
- Williston Park
- Yonkers
New York- Black Mountain
- Sparta
North Carolina- Erie
- Lima
- Millersville
- Mount Pocono
- Nixon
- Philipsburg
- Pocono Pines
- Radnor
- Troy
Pennsylvania- East Providence
- Providence
- Warwick
Rhode Island- Aiken
South Carolina- Newfane
Vermont- Snoqualmie
Washington- Genoa City
- Suamico
Wisconsin
United States