Hayden's sedge
- kingdom: Plantae
- phylum: Tracheophyta
- class: Liliopsida
- order: Poales
- family: Cyperaceae
- genus: Carex
- species: Carex haydenii
Agassiz
British ColumbiaOttawa
OntarioLa Sarre
Oka
Senneterre
Trois-Rivières
Quebec
CanadaBerwyn
Evanston
Manhattan
McCullom Lake
IllinoisGary
IndianaMountain Lake Park
MarylandAmherst Center
Dedham
Jamaica Plain
MassachusettsDuluth
MinnesotaBrookfield
MissouriAlexandria
Belle Haven
VirginiaMontesano
Washington
United States