Species (sp.): Tjønnaks (Potamogeton sp.)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Apeltunvatnet | Vestland, Norway | 2 | 1 | 1 | 2017-06-07 | |
| Bogstadvannet | Oslo, Norway | 1 | 1 | 0 | 1993-06-10 | |
| Eikedokktjernet | Buskerud, Norway | 1 | 1 | 0 | 1990-06-06 | |
| Elgtjern | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-15 | |
| Fetvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1989-09-29 | |
| Granavatnet | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-22 | |
| Grindheimsvatnet | Agder, Norway | 1 | 1 | 0 | 1989-09-19 | |
| Helsetvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 2007-05-25 | |
| Hjørungdalsvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1989-09-06 | |
| Håskjoldtjern | Møre og Romsdal, Norway | 1 | 1 | 0 | 1994-11-23 | |
| Ibestadvatnet | Troms, Norway | 1 | 1 | 0 | 1989-10-10 | |
| Jåbekkvannet | Agder, Norway | 1 | 1 | 0 | 1991-06-11 | |
| Kjemsjøen | Innlandet, Norway | 1 | 1 | 0 | 1989-09-14 | |
| Korssjøen | Vestfold, Norway | 1 | 1 | 0 | 1994-09-05 | |
| Langavatnet | Vestland, Norway | 1 | 1 | 0 | 1989-08-31 | |
| Lauvtjønna | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-14 | |
| Lianvatnet | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-04 | |
| Lille luktvann | Nordland, Norway | 1 | 1 | 0 | 1991-09-25 | |
| Litlevatn | Møre og Romsdal, Norway | 2 | 1 | 0 | 1994-09-07 | |
| Midsjøvannet | Akershus, Norway | 1 | 1 | 0 | 1989-09-21 | |
| Moensvatnet | Vestland, Norway | 1 | 1 | 0 | 1989-11-07 | |
| Nøklevann | Oslo, Norway | 1 | 1 | 0 | 1989-09-05 | |
| Oltervatnet | Nordland, Norway | 1 | 1 | 0 | 1989-09-14 | |
| Opsangervatnet | Vestland, Norway | 2 | 1 | 0 | 1994-06-03 | |
| Pytt ved Strand gård | Trøndelag, Norway | 1 | 1 | 0 | 2004-09-14 | |
| Reiarsvatnet | Rogaland, Norway | 3 | 1 | 0 | 1992-09-18 | |
| Reinsvolldammen | Innlandet, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Rørvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1989-10-11 | |
| Skarvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Skjelbreidvatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Tretjønnet | Agder, Norway | 1 | 1 | 0 | 1990-06-26 | |
| Ulfsbakktjønn | Vestfold, Norway | 2 | 1 | 0 | 1996-09-25 | |
| Vasslivatnet | Rogaland, Norway | 1 | 1 | 0 | 1994-11-24 | |