Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

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  Potamogeton gramineus L. image
Photographer: Robert W. Freckmann           

Botanical Illustration

Paul Skawinski

Paul Skawinski

Paul Skawinski

Paul Skawinski

Robert W. Freckmann
Family Potamogetonaceae
Potamogeton gramineus L.
grass-leaved pondweed, variable-leaved pondweed
Potamogeton: from Greek potamos, "a river," and geiton, "a neighbor," because of the habitat
gramineus: resembling grass, grassy
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: perennial, submersed aquatic; stems branched; spreading rhizomes
Flower: green-brown, small, stout stalk; inflorescence dense cylindrical spike
Fruit:dry, flat oval
Leaf:alternate, entire, with prominent midvein; submersed linear-lance like; 3-7 veins, stemless; floating stalked, 11-19 vein; stipules free in leaf axils
Habitat: water about 3' deep; in firm sediment soil

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

Flora of North America (off site)
Potamogeton gramineus L. var. graminifolius Fr.
Potamogeton gramineus L. var. maximus Morong ex A.Benn.
Potamogeton gramineus L. var. myriophyllus J.W.Robbins
Potamogeton gramineus L. var. typicus Ogden
Potamogeton heterophyllus auct. non Schreb.

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