threeway sedge
- kingdom: Plantae
- phylum: Tracheophyta
- class: Liliopsida
- order: Poales
- family: Cyperaceae
- genus: Dulichium
- species: Dulichium arundinaceum
Anmore- Burnaby
- Ladner
- Pitt Meadows
British Columbia- Boisbriand
- Labelle
- Thurso
Quebec
Canada
Bourbonnais- Bradley
- Chicago
- Kankakee
- McCullom Lake
Illinois- Steuben
Maine- Arden on the Severn
- Beltsville
- Bladensburg
- Brentwood
- Calverton
- Colmar Manor
- Cottage City
- District Heights
- East Riverdale
- Edmonston
- Goddard
- Hyattsville
- Lake Shore
- Lanham
- Morningside
- Mount Rainier
- Mountain Lake Park
- New Carrollton
- Pasadena
- Riverdale Park
- Seabrook
- Severna Park
- Suitland
- University Park
Maryland- Ludlow
Massachusetts- Haslett
Michigan- Corvallis
- Dunes City
Oregon- East Hill-Meridian
- Lacey
- Lakeland South
- Marysville
- Seattle
- Spanaway
Washington- Washington, D. C.
Washington, D.C.
United States