Genus: Alder (Alnus)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Almåselv | Vestland, Norway | 1 | 1 | 0 | 2015-08-31 | |
| Arboretet | Vestland, Norway | 1 | 1 | 0 | 2007-05-08 | |
| Arkavatnet | Rogaland, Norway | 1 | 1 | 0 | 1989-08-28 | |
| Asakmarka | Akershus, Norway | 5 | 2 | 0 | 2011-05-13 | |
| Aurdalslia | Vestland, Norway | 2 | 1 | 2 | 2013-05-28 | |
| Bakketun | Innlandet, Norway | 14 | 2 | 0 | 2019-04-29 | |
| Balderheim | Vestland, Norway | 6 | 1 | 0 | 2013-04-22 | |
| Bjørkelangen | Akershus, Norway | 5 | 2 | 0 | 2024-03-26 | |
| Blokknummer 80 | Møre og Romsdal, Norway | 2 | 1 | 0 | 2001-06-14 | |
| Bråte skole | Akershus, Norway | 1 | 1 | 0 | 2023-04-13 | |
| Bygdatunet, Granvin | Vestland, Norway | 1 | 1 | 1 | 2022-09-28 | |
| Eiabu, Movik | Troms, Norway | 14 | 1 | 0 | 2013-04-29 | |
| Eide | Vestland, Norway | 1 | 1 | 0 | 2009-05-26 | |
| Einang i Homme | Agder, Norway | 1 | 1 | 0 | 2005-08-25 | |
| Elverhøy | Rogaland, Norway | 1 | 1 | 0 | 2005-08-31 | |
| Enge | Vestland, Norway | 1 | 1 | 0 | 2003-04-13 | |
| Faret-Gullestad | Agder, Norway | 2 | 1 | 0 | 2004-05-06 | |
| Fløyta | Akershus, Norway | 1 | 1 | 0 | 1992-06-12 | |
| Fyresdal Kåsa sør | Telemark, Norway | 1 | 1 | 0 | 2016-03-23 | |
| Fæbydammen | Trøndelag, Norway | 2 | 1 | 0 | 2003-09-12 | |
| Gjellumvannet | Akershus, Norway | 1 | 1 | 0 | 2005-05-23 | |
| Grebstadlia | Møre og Romsdal, Norway | 1 | 1 | 0 | 2010-09-01 | |
| Grenland | Telemark, Norway | 1 | 1 | 0 | 2001-06-25 | |
| Gresvig | Østfold, Norway | 2 | 1 | 0 | 2012-05-04 | |
| Griggastemma | Vestland, Norway | 1 | 1 | 0 | 2015-09-01 | |
| Grimsby | Østfold, Norway | 1 | 1 | 0 | 2009-04-17 | |
| Grønnåsen | Nordland, Norway | 1 | 1 | 0 | 2004-09-13 | |
| Gudvangen | Vestland, Norway | 1 | 1 | 0 | 2001-05-11 | |
| Hagen rundt huset | Innlandet, Norway | 1 | 1 | 0 | 2010-06-26 | |
| Halsa-Holandsfjorden | Nordland, Norway | 1 | 1 | 0 | 2011-04-05 | |
| Hareid | Møre og Romsdal, Norway | 2 | 1 | 0 | 2008-10-09 | |
| Haugesund | Rogaland, Norway | 1 | 1 | 0 | 2003-03-03 | |
| Heer | Akershus, Norway | 1 | 1 | 0 | 2024-03-15 | |
| Hesnes skole | Agder, Norway | 2 | 1 | 0 | 2007-12-05 | |
| Hostadvatnet | Møre og Romsdal, Norway | 2 | 1 | 0 | 1993-06-16 | |
| Hustoft gnr. 150/4 | Rogaland, Norway | 19 | 2 | 0 | 2024-05-06 | |
| Hølaløkka | Oslo, Norway | 1 | 1 | 0 | 2014-03-18 | |
| Illestadvatnet | Vestfold, Norway | 2 | 2 | 1 | 2010-09-30 | |
| Isielva 1 | Akershus, Norway | 1 | 1 | 0 | 2008-10-22 | |
| Jensvollveien 12 | Nordland, Norway | 1 | 1 | 0 | 2021-08-27 | |
| Jordet skole | Vestfold, Norway | 2 | 1 | 0 | 2010-04-19 | |
| Jørpeland | Rogaland, Norway | 1 | 1 | 0 | 2022-09-08 | |
| Kaldfjord skole | Troms, Norway | 1 | 1 | 0 | 2013-05-22 | |
| Kirkebygden barne- og ungdomsskole | Akershus, Norway | 2 | 1 | 0 | 2022-09-15 | |
| Kjeldevatnet | Vestland, Norway | 60 | 2 | 4 | 2024-09-26 | |
| Kjelling | Nordland, Norway | 3 | 1 | 0 | 2011-04-24 | |
| Kolbjørnviksjøen | Østfold, Norway | 1 | 1 | 0 | 1989-09-01 | |
| Korsvik | Vestfold, Norway | 1 | 1 | 0 | 2010-03-04 | |
| Korsvika | Vestfold, Norway | 1 | 1 | 0 | 2011-03-22 | |
| Kramprudvegen 84 | Innlandet, Norway | 1 | 1 | 0 | 2011-04-10 |