Potamogeton illinoensis

Family (Traditional)Potamogetonaceae
Species:Potamogeton illinoensis Morong
Common NameIllinois Pondweed
Growth Habitforb
Plant Notes**
CharacteristicsArmaments: No; Milky Sap: No; Photosynthetic: Yes; Stipules: Yes; Woody Herbaceous: Herbaceous; Duration: Perennial; General Ecology: Aquatic; Growth Habit: forb; Moisture Requirements: Hydric; Moisture Requirements: Wetland; Region of Origin: North America; Reproductive Phenology: April; Reproductive Phenology: May; Reproductive Phenology: June; Reproductive Phenology: July; Reproductive Phenology: August; Reproductive Phenology: September; Leaf Arrangement: alternate; Leaf Arrangement: floating; Leaf Arrangement: opposite; Leaf Arrangement: submerged; Leaf Arrangement: subopposite; Leaf Complexity: simple; Leaf Dissection: 0; Leaf Fragrance: No; Leaf Persistance: Deciduous; Leaf Petiole Type: petiolate; Leaf Type: broadleaf; Leaf Type: grass-like; Leaf Venation: parallel; Leaflet Margins: entire; Leaflet Number: 0; Anther Type: Basifixed; Base Flower Color: Brown (incl. Maroon); Base Flower Color: Green; Carpel Number/Pistil: 1; Fruit Dehiscence: No; Fruit Type: Achene; Fruit Type: Drupe; Fruit Wet/Dry: Dry; Fruit Wet/Dry: Wet; Hypanthium Present: No; Inflorescence Position: terminal; Inflorescence Types: spike; Ovary Position: Superior; Overall Flower Symmetry: Actinomorphic; Perianth Present: Yes; Petal Fusion: No; Petal Number: 0; Pistil Complexity: Simple; Pistil Number: 4; Placentation Type: Basal; Placentation Type: Marginal; Sepal Fusion: No; Sepal Number: 4; Sexuality: monoclinous; Sporangium Arrangement: N/A; Stamen Number: 4; Tepal Fusion: No; Tepal Number: 0
C value 8
StatusNative; AGCP (OBL), EMP (OBL) (NWPL); KY[S2] (State Rank); G5 (Global Rank)
Specimen(s) View and Download Specimen Details »

** Not applicable or data not available.

Currently no photos are available for this plant.

Species Distribution Map

This species has been reported in the counties highlighted in the interactive distribution map below. Click on a county to display the its name. Click the question mark icon () to view additional information about the ecoregions shown. In the map legend, there are links to toggle the visibility of the ecoregions and/or their labels. In addition, clicking on an ecoregion name will highlight that region on the map.

  • State Boundaries
  • Counties
  • Counties - Species Present
  • Southeastern Plains
    • Blackland Prarie
  • Blue Ridge Mountains
  • Ridge and Valley
  • Cumberland Plateau
  • Cumberland Mountains
  • Allegheny Plateau
  • Interior Plateau
    • Bluegrass Region
    • Nashville Basin
    • Pennyroyal Karst Plain
    • Western Highland Rim
    • Eastern Highland Rim


SynonymFull Citation
Potamogeton angustifolius Potamogeton angustifolius Bercht. & K. Presl
Potamogeton heterophyllus Potamogeton heterophyllus Schreb.
Potamogeton lucens Potamogeton lucens auct. non L.
Potamogeton lucens var. connecticutensis Potamogeton lucens var. connecticutensis
Potamogeton lucens var. floridanus Potamogeton lucens var. floridanus
Potamogeton methyensis Potamogeton methyensis A. Benn.

Specimens and Distribution

This species has been reported in the following counties by the herbaria listed. An overview of the individual specimens are provided in the table that follows. Click on the accession number to view details; click on column headers to sort.

Counties included on distribution map: Ballard (KY), Jackson (KY), Jefferson (KY), Laurel (KY), Madison (KY), Wayne (KY)

Herbaria represented by specimen data listed below: APSC, BEREA, EKY, MDKY, TENN

Range of years during which specimens were collected: -

Accession No. (click for full details) County State Coll. Date Collector &
Collection No.
Herbarium &
Herbarium Name Used
31234100147329 Laurel Kentucky B. D. Fields
Potamogeton illinoensis
BEREA008367 Wayne Kentucky
Potamogeton illinoensis
BEREA008365 Jackson Kentucky
Potamogeton illinoensis
BEREA008364 Jackson Kentucky
Potamogeton illinoensis
BEREA008366 Madison Kentucky
Potamogeton illinoensis
MDKY00006722 Wayne Kentucky
Potamogeton illinoensis
MDKY00006723 Wayne Kentucky
Potamogeton illinoensis
TENN-V-0013432 Wayne Kentucky
Potamogeton illinoensis
APSC0104734 Jefferson Kentucky
Potamogeton illinoensis
APSC0104735 Ballard Kentucky
Potamogeton illinoensis
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