Equisetum arvense
| Participant | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. |
|---|---|---|---|---|---|
| Nils Battin | Agder, Norway | 8 | 1 | 0 | 2024-04-14 |
| Tove Hamre | Innlandet, Norway | 4 | 1 | 0 | 2017-04-30 |
| Sandsli videregående skole | Vestland, Norway | 2 | 1 | 0 | 2013-05-30 |
| Gol skule | Buskerud, Norway | 2 | 1 | 0 | 2010-05-28 |
| Stryn vidaregåande skule | Vestland, Norway | 2 | 1 | 0 | 2008-05-22 |
| Per Torgersen | Akershus, Norway | 2 | 2 | 0 | 2023-05-30 |
| Eidsvoll videregående skole | Akershus, Norway | 1 | 1 | 0 | 1992-06-12 |
| Søreide skole | Vestland, Norway | 1 | 1 | 0 | 2013-06-13 |
| Eli Brattland | Nordland, Norway | 1 | 1 | 0 | 2011-05-12 |
| Skolelaboratoriet, NTNU | Trøndelag, Norway | 1 | 1 | 0 | 2004-08-14 |
| Tylldalen skole | Innlandet, Norway | 1 | 1 | 0 | 2010-05-07 |
| Kråkstad skole | Akershus, Norway | 1 | 1 | 0 | 2009-08-20 |