Illinois pondweed
- kingdom: Plantae
- phylum: Tracheophyta
- class: Liliopsida
- order: Alismatales
- family: Potamogetonaceae
- genus: Potamogeton
- species: Potamogeton illinoensis
Belmopan
Cayo
Belize
Charlemagne
Lavaltrie
Longueuil
Quebec
Canada
San José
Petén
Guatemala
Benito Juarez
Mexico City
Anenecuilco
Ciudad Ayala
Morelos
Mexico
Spanish Fort
Alabama
Paragould
Arkansas
Eustis
Leesburg
McGregor
Whiskey Creek
Florida
Oquawka
Illinois
Columbia City
Culver
Fowler
Gary
Shorewood Forest
Indiana
Clear Lake
Iowa
Havre de Grace
Perryville
Maryland
Amherst Center
Cambridge
Somerville
Massachusetts
Le Center
Minnesota
Buffalo
Green Island
Herkimer
Mohawk
Troy
Watervliet
New York
Klamath Falls
Oregon
Hemlock Farms
Pennsylvania
Brushy Creek
Texas
Mead
Washington
Washington, D. C.
Washington, D.C.
Green Bay
Oconomowoc
Wisconsin
United States