Species: Sjøsivaks (Schoenoplectus lacustris)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Akersvannet | Vestfold, Norway | 2 | 1 | 0 | 1989-09-15 | |
| Bergemsvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1994-10-11 | |
| Bogstadvannet | Oslo, Norway | 1 | 1 | 0 | 1993-06-10 | |
| Dælivannet | Akershus, Norway | 1 | 1 | 0 | 1989-08-04 | |
| Espelandveien 240 | Rogaland, Norway | 1 | 1 | 2 | 2019-08-27 | |
| Frøylandsvatnet | Rogaland, Norway | 1 | 1 | 0 | 1992-10-05 | |
| Gjerdsetvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 2001-08-30 | |
| Gjerstadvannet | Agder, Norway | 1 | 1 | 0 | 2005-11-10 | |
| Gravdalsvatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-18 | |
| Griggastemma | Vestland, Norway | 1 | 1 | 1 | 2015-09-01 | |
| 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 | |
| Helsetvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 2008-05-28 | |
| Hostadvatnet | Møre og Romsdal, Norway | 2 | 1 | 0 | 1993-06-16 | |
| Husavatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-28 | |
| Jarenvannet | Innlandet, Norway | 2 | 1 | 0 | 1992-09-17 | |
| Kolbjørnviksjøen | Østfold, Norway | 2 | 1 | 0 | 1990-08-29 | |
| Korssjøen | Vestfold, Norway | 1 | 1 | 0 | 1996-09-09 | |
| Kvitblikkvannet | Nordland, Norway | 5 | 1 | 0 | 1993-09-02 | |
| Lauvtjønna | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-14 | |
| Ledengstjern | Østfold, Norway | 1 | 1 | 0 | 1994-05-27 | |
| Ljøgodttjern | Akershus, Norway | 1 | 1 | 0 | 1989-09-21 | |
| Maltjern | Akershus, Norway | 2 | 1 | 0 | 1991-06-12 | |
| Midsjøvannet | Akershus, Norway | 1 | 1 | 0 | 1989-09-21 | |
| Molbekktjernet | Østfold, Norway | 1 | 1 | 0 | 1989-09-04 | |
| Mosvatnet | Rogaland, Norway | 2 | 1 | 0 | 1994-11-25 | |
| Myklavatnet | Vestland, Norway | 1 | 1 | 0 | 1990-09-25 | |
| Nøklevann | Oslo, Norway | 2 | 1 | 0 | 1994-09-05 | |
| Patterød | Østfold, Norway | 1 | 1 | 0 | 2003-06-05 | |
| Reiarsvatnet | Rogaland, Norway | 1 | 1 | 0 | 1992-09-18 | |
| Rossevatn | Rogaland, Norway | 1 | 1 | 0 | 1989-09-06 | |
| Sagtjernet | Innlandet, Norway | 1 | 1 | 0 | 1989-09-20 | |
| Stavsjø | Innlandet, Norway | 2 | 1 | 0 | 1989-09-05 | |
| Stokkevannet | Telemark, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Tornesvatnet | Rogaland, Norway | 1 | 1 | 0 | 1989-09-07 | |
| Tretjønnet | Agder, Norway | 1 | 1 | 0 | 1989-09-27 | |
| Tveitavatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-24 | |
| Vikerauntjønna | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-19 | |
| Øksnevadtjørna | Rogaland, Norway | 1 | 1 | 0 | 1994-11-23 | |
| Årstadtjødne | Rogaland, Norway | 1 | 1 | 0 | 1994-11-24 | |