Species: Hjertetjernaks (Potamogeton perfoliatus)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Arkavatnet | Rogaland, Norway | 1 | 1 | 0 | 1989-08-28 | |
| Bogstadvannet | Oslo, Norway | 1 | 1 | 0 | 1993-06-10 | |
| Fæbydammen | Trøndelag, Norway | 1 | 1 | 0 | 2003-09-12 | |
| Granavatnet | Trøndelag, Norway | 1 | 1 | 0 | 1991-09-10 | |
| Harestuvannet | Akershus, Norway | 2 | 1 | 0 | 2004-09-01 | |
| Haukvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2013-06-05 | |
| Hostadvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1992-09-08 | |
| Korssjøen | Vestfold, Norway | 1 | 1 | 0 | 1996-09-09 | |
| Kvitblikkvannet | Nordland, Norway | 3 | 1 | 0 | 1993-09-02 | |
| Litjvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2004-08-14 | |
| Nordre Skeisvatn | Rogaland, Norway | 1 | 1 | 0 | 2005-09-16 | |
| Resvatnet | Trøndelag, Norway | 1 | 1 | 0 | 1991-09-01 | |
| Semsvannet | Akershus, Norway | 1 | 1 | 0 | 1989-09-21 | |
| Sillongen | Innlandet, Norway | 1 | 1 | 0 | 1989-09-14 | |
| Stavsjø | Innlandet, Norway | 1 | 1 | 0 | 1989-09-05 | |
| Storvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2004-08-14 | |
| Storvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2004-09-14 | |
| Tornesvatnet | Rogaland, Norway | 1 | 1 | 0 | 1989-09-07 | |
| Vikerauntjønna | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-19 | |
| Årungen | Akershus, Norway | 1 | 1 | 0 | 1991-09-16 | |