Species: Grastjernaks (Potamogeton gramineus)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Gjerstadvannet | Agder, Norway | 1 | 1 | 0 | 2005-11-10 | |
| Granavatnet | Trøndelag, Norway | 3 | 1 | 0 | 1997-09-04 | |
| Kvitblikkvannet | Nordland, Norway | 1 | 1 | 0 | 1991-09-25 | |
| Ledengstjern | Østfold, Norway | 1 | 1 | 0 | 1994-05-27 | |
| Ljøgodttjern | Akershus, Norway | 1 | 1 | 0 | 1989-09-21 | |
| Mosvatnet | Rogaland, Norway | 1 | 1 | 0 | 1989-09-05 | |
| Rossevatn | Rogaland, Norway | 1 | 1 | 0 | 1989-09-06 | |
| Spildervatnet | Nordland, Norway | 1 | 1 | 0 | 1994-06-10 | |
| Tornesvatnet | Rogaland, Norway | 1 | 1 | 0 | 1989-09-07 | |
| Vikerauntjønna | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-19 | |
| Øvre Storfjordvatnet | Nordland, Norway | 1 | 1 | 0 | 1989-09-01 | |
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