Myriophyllum alterniflorum
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Arkavatnet | Rogaland, Norway | 1 | 1 | 0 | 1989-08-28 | |
| Bergemsvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1994-10-11 | |
| Bergvikvatnet | Nordland, Norway | 1 | 1 | 0 | 1989-09-18 | |
| Bogstadvannet | Oslo, Norway | 2 | 1 | 0 | 1994-06-06 | |
| Eikedokktjernet | Buskerud, Norway | 1 | 1 | 0 | 1990-06-06 | |
| Fetvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1989-09-29 | |
| Floen | Vestland, Norway | 1 | 1 | 0 | 1994-11-24 | |
| Gjerdsetvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 2001-08-30 | |
| Granavatnet | Trøndelag, Norway | 1 | 1 | 0 | 1997-09-04 | |
| Hammervatnet | Trøndelag, Norway | 1 | 1 | 0 | 1989-10-08 | |
| Harestuvannet | Akershus, Norway | 1 | 1 | 0 | 1990-09-04 | |
| Haukvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2013-06-05 | |
| Helsetvatnet | Møre og Romsdal, Norway | 7 | 1 | 1 | 2009-05-28 | |
| Ibestadvatnet | Troms, Norway | 1 | 1 | 0 | 1989-10-10 | |
| Krussætertjern | Østfold, Norway | 1 | 1 | 0 | 2000-04-12 | |
| Kvitblikkvannet | Nordland, Norway | 4 | 1 | 0 | 1993-09-02 | |
| Laksådalsvatnet | Nordland, Norway | 1 | 1 | 0 | 1989-09-14 | |
| Lauvtjønna | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-14 | |
| Ledengstjern | Østfold, Norway | 1 | 1 | 0 | 1994-05-27 | |
| Lianvatnet | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-04 | |
| Liavatnet | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-19 | |
| Litjvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2004-08-14 | |
| Madsvannet | Nordland, Norway | 1 | 1 | 0 | 1990-09-22 | |
| Mannslagervatnet | Nordland, Norway | 1 | 1 | 0 | 1989-08-30 | |
| Mosvatnet | Rogaland, Norway | 1 | 1 | 0 | 1994-11-25 | |
| Myklavatnet | Vestland, Norway | 1 | 1 | 0 | 1990-09-25 | |
| Nordre Skeisvatn | Rogaland, Norway | 1 | 1 | 0 | 2005-09-16 | |
| 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 | |
| Opsangervatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-25 | |
| Reinsvolldammen | Innlandet, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Resvatnet | Trøndelag, Norway | 1 | 1 | 0 | 1991-09-01 | |
| Skarvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1989-09-13 | |
| skraperudtjern | Oslo, Norway | 1 | 1 | 0 | 2011-09-15 | |
| Spildervatnet | Nordland, Norway | 1 | 1 | 0 | 1989-09-20 | |
| Stokkevannet | Telemark, Norway | 1 | 1 | 0 | 1989-09-13 | |
| 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 | 2 | 2004-08-14 | |
| Sundkilen | Telemark, Norway | 1 | 1 | 0 | 1989-09-07 | |
| Svartåstjern | Buskerud, Norway | 1 | 1 | 0 | 1990-09-04 | |
| Tornesvatnet | Rogaland, Norway | 1 | 1 | 0 | 1989-09-07 | |
| Tussvatnet | Nordland, Norway | 2 | 1 | 0 | 1990-06-07 | |
| Ulfsbakktjønn | Vestfold, Norway | 2 | 1 | 0 | 1997-09-16 | |
| Vikerauntjønna | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-19 | |
| Øvre Storfjordvatnet | Nordland, Norway | 1 | 1 | 0 | 1989-09-01 |