Family: Ålegrasfamilien (Zosteraceae)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Hetland | Rogaland, Norway | 3 | 1 | 0 | 1995-09-28 | |
| Hetlevik | Vestland, Norway | 6 | 1 | 0 | 1995-10-13 | |
| Hisøy | Agder, Norway | 12 | 1 | 0 | 1997-10-02 | |
| Hjelset | Møre og Romsdal, Norway | 1 | 1 | 0 | 1993-09-23 | |
| Hodne/Reve (Bore) | Rogaland, Norway | 2 | 1 | 0 | 1993-09-01 | |
| Hofles | Trøndelag, Norway | 1 | 1 | 0 | 1994-10-04 | |
| Holmavike | Rogaland, Norway | 2 | 1 | 0 | 2000-06-16 | |
| Holmestrand | Vestfold, Norway | 2 | 1 | 0 | 1994-11-10 | |
| Holmestrand | Vestfold, Norway | 32 | 1 | 0 | 1998-09-18 | |
| Holtefjell | Vestfold, Norway | 15 | 1 | 0 | 1998-09-24 | |
| Horten | Vestfold, Norway | 49 | 1 | 0 | 1998-10-08 | |
| Hovedøya | Oslo, Norway | 4 | 1 | 0 | 1996-10-16 | |
| Hundvåg | Rogaland, Norway | 29 | 1 | 0 | 1997-10-14 | |
| Hundvåg | Rogaland, Norway | 10 | 1 | 0 | 1998-10-12 | |
| Hvasser | Vestfold, Norway | 8 | 1 | 0 | 1994-11-30 | |
| Hvasser | Vestfold, Norway | 21 | 1 | 0 | 1996-10-10 | |
| Håkonshella | Vestland, Norway | 1 | 1 | 0 | 2012-09-28 | |
| Håkonshella - Pollen | Vestland, Norway | 1 | 1 | 1 | 2013-08-15 | |
| Håkvik | Nordland, Norway | 3 | 1 | 0 | 1996-10-09 | |
| Hårkollen | Vestfold, Norway | 48 | 1 | 0 | 1998-09-24 | |
| Håøya | Agder, Norway | 8 | 1 | 0 | 1994-11-04 | |
| Ilene | Vestfold, Norway | 23 | 1 | 0 | 1997-09-18 | |
| Indre Lafjord | Agder, Norway | 18 | 1 | 0 | 1995-09-27 | |
| Indrehavn | Vestfold, Norway | 2 | 1 | 0 | 1993-11-29 | |
| Inndyr | Nordland, Norway | 4 | 1 | 0 | 1998-09-28 | |
| Innsmøla | Møre og Romsdal, Norway | 2 | 1 | 0 | 1996-09-19 | |
| Jansvik | Nordland, Norway | 1 | 1 | 0 | 1995-10-26 | |
| Jerkholmen | Agder, Norway | 4 | 1 | 0 | 1996-09-19 | |
| Jomfruland | Telemark, Norway | 1 | 1 | 0 | 1995-09-07 | |
| Judaberg | Rogaland, Norway | 9 | 1 | 0 | 1994-12-20 | |
| Justøya | Agder, Norway | 3 | 1 | 0 | 1995-09-08 | |
| Jåsund, Meling, Haga | Rogaland, Norway | 6 | 1 | 0 | 1993-09-28 | |
| Kaldvellfjorden | Agder, Norway | 27 | 1 | 0 | 1998-09-24 | |
| Karl Johans vern | Vestfold, Norway | 1 | 1 | 0 | 1994-09-23 | |
| Kjenestangen | Agder, Norway | 2 | 1 | 0 | 1993-09-24 | |
| Kjøpmannsskjær | Vestfold, Norway | 3 | 1 | 0 | 1993-12-22 | |
| Kolbeinsrød | Vestfold, Norway | 20 | 1 | 0 | 1997-09-09 | |
| Kollevåg | Vestland, Norway | 2 | 1 | 0 | 1993-11-02 | |
| Kolvereid | Trøndelag, Norway | 4 | 1 | 0 | 1995-10-04 | |
| Kongsgårdbukta | Agder, Norway | 6 | 1 | 0 | 1995-10-16 | |
| Kopervik | Rogaland, Norway | 2 | 1 | 0 | 1994-11-25 | |
| Korsvik | Vestfold, Norway | 1 | 1 | 0 | 2014-09-01 | |
| Kringlevågen | Vestland, Norway | 5 | 1 | 0 | 1998-08-31 | |
| Kuvågen | Vestland, Norway | 17 | 1 | 0 | 1995-10-17 | |
| Kvaløysletta | Troms, Norway | 4 | 1 | 0 | 1993-11-12 | |
| Kvamsøy | Møre og Romsdal, Norway | 2 | 1 | 0 | 1995-09-18 | |
| Kyrkjebø | Vestland, Norway | 1 | 1 | 0 | 1994-10-10 | |
| Kyrksæterøra | Trøndelag, Norway | 13 | 1 | 0 | 1995-06-07 | |
| Lamøya | Vestfold, Norway | 1 | 1 | 0 | 1995-10-17 | |
| Lamøya | Vestfold, Norway | 3 | 1 | 0 | 1994-11-04 | |
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