| Tjønnaks (Potamogeton sp.) | | 2017-06-08 | 2017-06-07 |  | Apeltunvatnet (Vestland, Norway) | |
| Tjønnaks (Potamogeton sp.) | | 2017-06-07 | 2017-06-07 | | Apeltunvatnet (Vestland, Norway) | |
| Hjertetjernaks (Potamogeton perfoliatus) | | 2013-06-11 | 2013-06-05 | | Haukvatnet (Trøndelag, Norway) | |
| Tjernaks (Potamogeton natans) | | 2011-10-13 | 2011-09-15 | | skraperudtjern (Oslo, Norway) | |
| Tjernaks (Potamogeton natans) | | 2009-05-28 | 2009-05-28 | | Helsetvatnet (Møre og Romsdal, Norway) | |
| Tjernaks (Potamogeton natans) | | 2008-06-02 | 2008-05-28 | | Helsetvatnet (Møre og Romsdal, Norway) |  |
| Tjernaks (Potamogeton natans) | | 2008-05-29 | 2008-05-28 | | Helsetvatnet (Møre og Romsdal, Norway) | |
| Tjønnaks (Potamogeton sp.) | | 2007-06-04 | 2007-05-25 | | Helsetvatnet (Møre og Romsdal, Norway) | |
| Grastjernaks (Potamogeton gramineus) | | 2005-11-10 | 2005-11-10 | | Gjerstadvannet (Agder, Norway) | |
| Hjertetjernaks (Potamogeton perfoliatus) | | 2005-09-29 | 2005-09-16 | | Nordre Skeisvatn (Rogaland, Norway) | |
| Tjernaks (Potamogeton natans) | | 2005-08-23 | 2005-08-23 | | Helsetvatnet (Møre og Romsdal, Norway) | |
| Tjernaks (Potamogeton natans) | | 2005-08-22 | 2005-08-21 | | Tranevatnet (Vestland, Norway) | |
| Tjønnaks (Potamogeton sp.) | | 2004-10-01 | 2004-09-14 | | Pytt ved Strand gård (Trøndelag, Norway) | |
| Hjertetjernaks (Potamogeton perfoliatus) | | 2004-09-27 | 2004-09-14 | | Storvatnet (Trøndelag, Norway) | |
| Tjernaks (Potamogeton natans) | | 2004-09-06 | 2004-09-06 | | Helsetvatnet (Møre og Romsdal, Norway) | |
| Hjertetjernaks (Potamogeton perfoliatus) | | 2004-09-02 | 2004-09-01 | | Harestuvannet (Akershus, Norway) | |
| Tjernaks (Potamogeton natans) | | 2004-09-02 | 2004-09-01 | | Harestuvannet (Akershus, Norway) | |
| Hjertetjernaks (Potamogeton perfoliatus) | | 2004-08-14 | 2004-08-14 | | Storvatnet (Trøndelag, Norway) | |
| Trådtjernaks (Stuckenia filiformis) | | 2004-08-14 | 2004-08-14 | | Storvatnet (Trøndelag, Norway) | |
| Tjernaks (Potamogeton natans) | | 2004-08-14 | 2004-08-14 | | Storvatnet (Trøndelag, Norway) | |
| Kysttjønnaks (Potamogeton polygonifolius) | | 2004-08-14 | 2004-08-14 | | Pytt ved Strand gård (Trøndelag, Norway) | |
| Rusttjernaks (Potamogeton alpinus) | | 2004-08-14 | 2004-08-14 | | Litjvatnet (Trøndelag, Norway) | |
| Hjertetjernaks (Potamogeton perfoliatus) | | 2004-08-14 | 2004-08-14 | | Litjvatnet (Trøndelag, Norway) | |
| Tjernaks (Potamogeton natans) | | 2003-09-16 | 2003-09-16 | | Helsetvatnet (Møre og Romsdal, Norway) | |
| Hjertetjernaks (Potamogeton perfoliatus) | | 2003-09-12 | 2003-09-12 | | Fæbydammen (Trøndelag, Norway) | |
| Tjernaks (Potamogeton natans) | | 2003-06-11 | 2003-06-11 | | Fæbydammen (Trøndelag, Norway) | |
| Tjernaks (Potamogeton natans) | | 2002-03-12 | 2001-08-24 | | Odderøya (Agder, Norway) | |
| Tjernaks (Potamogeton natans) | | 2001-09-26 | 2001-08-30 | | Gjerdsetvatnet (Møre og Romsdal, Norway) | |
| Tjønnaks (Potamogeton sp.) | | 1990-06-26 | 1990-06-26 | | Tretjønnet (Agder, Norway) | |
| Tjernaks (Potamogeton natans) | | 1989-09-27 | 1989-09-27 | | Tretjønnet (Agder, Norway) | |
| Trådtjernaks (Stuckenia filiformis) | | 1989-09-19 | 1989-09-19 | | Liavatnet (Trøndelag, Norway) | |
| Tjernaks (Potamogeton natans) | | 1989-09-19 | 1989-09-19 | | Liavatnet (Trøndelag, Norway) | |
| Tjernaks (Potamogeton natans) | | 1989-09-15 | 1989-09-15 | | Akersvannet (Vestfold, Norway) | |
| Tjernaks (Potamogeton natans) | | 1989-09-08 | 1989-09-08 | | Stordammen (Akershus, Norway) | |
| Trådtjernaks (Stuckenia filiformis) | | 1989-09-29 | 1989-09-29 | | Fetvatnet (Møre og Romsdal, Norway) | |
| Tjønnaks (Potamogeton sp.) | | 1989-09-29 | 1989-09-29 | | Fetvatnet (Møre og Romsdal, Norway) | |
| Tjernaks (Potamogeton natans) | | 1989-09-04 | 1989-09-04 | | Molbekktjernet (Østfold, Norway) | |
| Tjernaks (Potamogeton natans) | | 1995-10-18 | 1995-10-18 | | Stølevannet (Vestland, Norway) | |
| Tjønnaks (Potamogeton sp.) | | 1996-09-25 | 1996-09-25 | | Ulfsbakktjønn (Vestfold, Norway) | |
| Tjønnaks (Potamogeton sp.) | | 1995-09-25 | 1995-09-25 | | Ulfsbakktjønn (Vestfold, Norway) | |
| Tjernaks (Potamogeton natans) | | 1994-11-25 | 1994-11-25 | | Ørsjøen (Innlandet, Norway) | |
| Hjertetjernaks (Potamogeton perfoliatus) | | 1993-06-10 | 1993-06-10 | | Bogstadvannet (Oslo, Norway) | |
| Tjønnaks (Potamogeton sp.) | | 1993-06-10 | 1993-06-10 | | Bogstadvannet (Oslo, Norway) | |
| Kysttjønnaks (Potamogeton polygonifolius) | | 1994-11-23 | 1994-11-23 | | Håskjoldtjern (Møre og Romsdal, Norway) | |
| Tjernaks (Potamogeton natans) | | 1994-11-23 | 1994-11-23 | | Håskjoldtjern (Møre og Romsdal, Norway) | |
| Tjønnaks (Potamogeton sp.) | | 1994-11-23 | 1994-11-23 | | Håskjoldtjern (Møre og Romsdal, Norway) | |
| Tjønnaks (Potamogeton sp.) | | 1991-09-25 | 1991-09-25 | | Lille luktvann (Nordland, Norway) | |
| Tjønnaks (Potamogeton sp.) | | 1991-06-11 | 1991-06-11 | | Jåbekkvannet (Agder, Norway) | |
| Hjertetjernaks (Potamogeton perfoliatus) | | 1990-09-04 | 1990-09-04 | | Harestuvannet (Akershus, Norway) | |
| Tjernaks (Potamogeton natans) | | 1990-09-04 | 1990-09-04 | | Harestuvannet (Akershus, Norway) | |
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