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Photographer: Paul Skawinski
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Family Potamogetonaceae
Potamogeton illinoensis Morong
Illinois pondweed
Potamogeton: from Greek potamos, "a river," and geiton, "a neighbor," because of the habitat
illinoensis: from Illinois
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| 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) |
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