Species: Tjernaks (Potamogeton natans)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Akersvannet | Vestfold, Norway | 1 | 1 | 0 | 1989-09-15 | |
| Arkavatnet | Rogaland, Norway | 1 | 1 | 0 | 1989-08-28 | |
| Dælivannet | Akershus, Norway | 1 | 1 | 0 | 1989-08-04 | |
| Elgtjern | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-15 | |
| Fæbydammen | Trøndelag, Norway | 1 | 1 | 0 | 2003-06-11 | |
| Gjerdsetvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 2001-08-30 | |
| Gårdsdam - Hvam vgs. | Akershus, Norway | 1 | 1 | 0 | 2000-06-07 | |
| Hammervatnet | Trøndelag, Norway | 1 | 1 | 0 | 1989-10-08 | |
| Harestuvannet | Akershus, Norway | 2 | 1 | 0 | 2004-09-01 | |
| Haukvatnet | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-05 | |
| Helsetvatnet | Møre og Romsdal, Norway | 6 | 1 | 0 | 2009-05-28 | |
| Hjørungdalsvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1989-09-06 | |
| Hostadvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1990-09-18 | |
| Håskjoldtjern | Møre og Romsdal, Norway | 1 | 1 | 0 | 1994-11-23 | |
| Jarenvannet | Innlandet, Norway | 1 | 1 | 0 | 1989-08-29 | |
| Kolbjørnviksjøen | Østfold, Norway | 2 | 1 | 0 | 1989-09-01 | |
| Kolbotnvannet | Akershus, Norway | 1 | 1 | 0 | 1990-09-25 | |
| Koltjønna | Trøndelag, Norway | 2 | 1 | 0 | 1991-08-28 | |
| Korssjøen | Vestfold, Norway | 3 | 1 | 0 | 1993-09-09 | |
| Kruktjønna | Trøndelag, Norway | 1 | 1 | 0 | 1991-08-28 | |
| Krussætertjern | Østfold, Norway | 1 | 1 | 0 | 2000-09-08 | |
| Kvitblikkvannet | Nordland, Norway | 5 | 1 | 0 | 1993-09-02 | |
| Laupen | Innlandet, Norway | 1 | 1 | 0 | 1989-09-27 | |
| Ledengstjern | Østfold, Norway | 1 | 1 | 0 | 1994-05-27 | |
| Liavatnet | Vestland, Norway | 1 | 1 | 0 | 1994-09-14 | |
| Liavatnet | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-19 | |
| Ljøgodttjern | Akershus, Norway | 1 | 1 | 0 | 1989-09-21 | |
| Molbekktjernet | Østfold, Norway | 1 | 1 | 0 | 1989-09-04 | |
| Nøklevann | Oslo, Norway | 3 | 1 | 0 | 1994-09-05 | |
| Odderøya | Agder, Norway | 1 | 1 | 0 | 2001-08-24 | |
| Oltervatnet | Nordland, Norway | 1 | 1 | 0 | 1989-09-14 | |
| Raudsjøen | Trøndelag, Norway | 1 | 1 | 0 | 1989-08-31 | |
| Reiarsvatnet | Rogaland, Norway | 1 | 1 | 0 | 1991-09-16 | |
| Resvatnet | Trøndelag, Norway | 1 | 1 | 0 | 1991-09-01 | |
| Rossevatn | Rogaland, Norway | 1 | 1 | 0 | 1989-09-06 | |
| Sagtjernet | Innlandet, Norway | 1 | 1 | 0 | 1989-09-20 | |
| Seljebøvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1989-09-19 | |
| Semsvannet | Akershus, Norway | 1 | 1 | 0 | 1989-09-21 | |
| Sillongen | Innlandet, Norway | 1 | 1 | 0 | 1989-09-14 | |
| Skarvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Skjelbreidvatnet | Vestland, Norway | 1 | 1 | 0 | 1990-09-18 | |
| skraperudtjern | Oslo, Norway | 1 | 1 | 0 | 2011-09-15 | |
| Stavsjø | Innlandet, Norway | 2 | 1 | 0 | 1989-09-05 | |
| Storavatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-26 | |
| Stordammen | Akershus, Norway | 1 | 1 | 0 | 1989-09-08 | |
| Storvannet | Nordland, Norway | 1 | 1 | 0 | 1990-09-07 | |
| Storvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2004-08-14 | |
| Stølevannet | Vestland, Norway | 1 | 1 | 0 | 1995-10-18 | |
| Svartaholtjørnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-21 | |
| Tornesvatnet | Rogaland, Norway | 1 | 1 | 0 | 1989-09-07 | |