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Photographer: Robert W. Freckmann
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Family Potamogetonaceae
Potamogeton spirillus Tuck.
northern snail-seed pondweed, spiral-fruited pondweed
Potamogeton: from Greek potamos, "a river," and geiton, "a neighbor," because of the habitat
spirillus: spiralled
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| Status: | Native |
| Plant: | perennial, submersed aquatic; stems slender, much branched, compact; slight, spreading rhizomes |
| Flower: | green-brown, small, various length stalks; inflorescence compact head to cylindrical cluster |
| Fruit: | dry, flat disk-like, top toothed, sides smooth |
| Leaf: | alternate, entire, with prominent midvein; submersed linear, curvy; floating elliptical; stipules fused to leaf blade more than half their length |
| Habitat: | shallow water; in sediment soil |
| (Glossary) |
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