Robert W. Freckmann Herbarium


  Potamogeton illinoensis Morong image
Photographer: Paul Skawinski           

Andrew Hipp

Paul Skawinski

Paul Skawinski

Paul Skawinski

Paul Skawinski

Robert W. Freckmann

Robert W. Freckmann
Family Potamogetonaceae
Potamogeton illinoensis Morong
Illinois pondweed
Potamogeton: from Greek potamos, "a river," and geiton, "a neighbor," because of the habitat
illinoensis: from Illinois
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: perennial, submersed aquatic; stems to 7', stout; thick rhizomes
Flower: green-brown, small, stalk usually thicker than stem; inflorescence dense cylindrical spike
Fruit:dry seed with 3 dorsal ridges and a short beak
Leaf:alternate, entire, with prominent midvein, 9-19 veins, stipules free of axils of leaves & with 2 ridges; sometimes produces elliptical floating leaves
Habitat: clear water to >10'
(Glossary)

More Information Natural Communities Herbarium Specimens
All Potamogeton list Google- Images or Text

Flora of North America (off site)
Synonyms 
Potamogeton angustifolius Bercht. & C.Presl.
Potamogeton lucens auct. non L.

         
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