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Photographer: Robert W. Freckmann
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Family Potamogetonaceae
Potamogeton robbinsii Oakes
fern pondweed, Robbins' pondweed
Potamogeton: from Greek potamos, "a river," and geiton, "a neighbor," because of the habitat
robbinsii: for James Watson Robbins (1801-1879)
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| Status: | Native |
| Plant: | perennial, submersed aquatic; stems robust; spreading rhizomes |
| Flower: | green-brown, small, stalk from upper leaf axils; inflorescence spike of whorls |
| Fruit: | dry seed with a sharp dorsal ridge and 2 rounded lateral ridges, fruit rarely develops |
| Leaf: | alternate, entire, with prominent midvein; strongly 2-ranked, feather-like, firm, linear, wrapping stem; closely spaced, finely serrated edges |
| Habitat: | deeper water |
| Notes: | where leaf and fibrous stipules meet and fuse, leaf has ear-like lobes; no floating leaves |
| (Glossary) |
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