Corylus avellana (Common Hazel)
| Participant | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. |
|---|---|---|---|---|---|
| Haugaland landbruksrådgjeving | Vestland, Norway | 46 | 1 | 0 | 2024-04-28 |
| Rune Nilsen | Agder, Norway | 36 | 1 | 1 | 2024-05-07 |
| Gunvor Hustoft | Rogaland, Norway | 32 | 1 | 1 | 2024-04-13 |
| Bioforsk Midt-Norge | Trøndelag, Norway | 28 | 1 | 0 | 2007-04-20 |
| Nils Battin | Agder, Norway | 9 | 1 | 0 | 2024-03-07 |
| Frans-Emil Wielgolaski | Oslo, Norway | 9 | 1 | 0 | 2012-03-01 |
| Søre Fusa Oppvekstsenter/Avdeling skule | Vestland, Norway | 8 | 1 | 0 | 2013-03-18 |
| Charlotte Bakke | Telemark, Norway | 8 | 1 | 0 | 2022-04-23 |
| Skien videregående skole/Avd Brekkeby | Telemark, Norway | 8 | 1 | 0 | 2009-05-12 |
| Ottar Sætre | Møre og Romsdal, Norway | 5 | 1 | 0 | 2021-05-01 |
| Elly Hardy Bakstad | Vestfold, Norway | 5 | 1 | 0 | 2011-03-21 |
| Høgskolen i Bergen, avd. lærerutdanning | Vestland, Norway | 5 | 1 | 0 | 2006-02-22 |
| Kjell Arne Olsen | Vestfold, Norway | 4 | 1 | 0 | 2019-04-28 |
| Knappskog skule | Vestland, Norway | 4 | 1 | 1 | 2011-04-14 |
| Tove Hamre | Innlandet, Norway | 4 | 1 | 0 | 2015-05-14 |
| Universitetet i Stavanger | Rogaland, Norway | 4 | 1 | 1 | 2021-09-03 |
| Fjell ungdomsskule | Vestland, Norway | 4 | 1 | 0 | 2005-08-29 |
| Re videregående skole | Vestfold, Norway | 4 | 1 | 0 | 2022-09-02 |
| Vikevåg skule | Rogaland, Norway | 3 | 1 | 1 | 2005-03-30 |
| Lars Slettom | Trøndelag, Norway | 3 | 1 | 0 | 2011-03-20 |
| Anders Røynstrand | Vestland, Norway | 3 | 1 | 0 | 2008-04-17 |
| Hans Petter Høie | Telemark, Norway | 3 | 1 | 0 | 2012-03-14 |
| Auklandshamn skule | Vestland, Norway | 3 | 1 | 0 | 2004-04-10 |
| Eikeli videregående skole | Akershus, Norway | 3 | 1 | 0 | 2014-08-27 |
| Jordet skole | Vestfold, Norway | 3 | 1 | 0 | 2010-04-19 |
| Jostein Bakke | Telemark, Norway | 3 | 1 | 0 | 2007-03-24 |
| Berge ungdomsskole | Agder, Norway | 3 | 1 | 0 | 2003-06-16 |
| Gol skule | Buskerud, Norway | 2 | 1 | 0 | 2010-05-20 |
| Frede Thorsheim | Vestland, Norway | 2 | 1 | 1 | 2014-02-16 |
| Sølve Tegner Stenmark | Østfold, Norway | 2 | 1 | 0 | 2020-01-28 |
| Hedrum barneskole | Vestfold, Norway | 2 | 1 | 0 | 2001-05-10 |
| Grevlingen skole og kultursenter | Akershus, Norway | 2 | 1 | 0 | 2006-08-23 |
| Nordstrand skole | Oslo, Norway | 2 | 1 | 2 | 2015-06-04 |
| Tertnes videregående skole | Vestland, Norway | 2 | 1 | 1 | 2015-08-31 |
| Magne Flåten | Vestfold, Norway | 2 | 1 | 0 | 2008-02-18 |
| Mardon Hjelle | Møre og Romsdal, Norway | 2 | 1 | 0 | 2008-10-09 |
| Frei ungdomsskole | Møre og Romsdal, Norway | 2 | 1 | 0 | 2001-06-14 |
| Per Torgersen | Akershus, Norway | 2 | 1 | 0 | 2023-03-27 |
| Samnanger ungdomsskule | Vestland, Norway | 2 | 1 | 2 | 2019-09-17 |
| Byskogen skole | Vestfold, Norway | 2 | 1 | 0 | 2010-04-30 |
| Sandnes skule | Vestland, Norway | 2 | 1 | 0 | 2003-04-29 |
| Martin Kvist | Akershus, Norway | 2 | 1 | 0 | 2024-04-24 |
| Stryn vidaregåande skule | Vestland, Norway | 2 | 1 | 0 | 2013-06-12 |
| Roy Bruncell | Østfold, Norway | 2 | 1 | 0 | 2012-05-04 |
| Trine Lise Fjelldal | Møre og Romsdal, Norway | 2 | 1 | 0 | 2011-04-01 |
| Alexander S. Svendsen | Agder, Norway | 1 | 1 | 0 | 2015-02-28 |
| Monika Kristine Zimmermann | Telemark, Norway | 1 | 1 | 1 | 2017-05-19 |
| Betsy I. Engly Braseth | Østfold, Norway | 1 | 1 | 0 | 2020-03-06 |
| Ole Andreas Brekkemoen | Agder, Norway | 1 | 1 | 0 | 2019-03-31 |
| Bratsbergkleiva skole | Telemark, Norway | 1 | 1 | 0 | 2020-03-24 |