Cirsium arvense
| Participant | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. |
|---|---|---|---|---|---|
| Tove Hamre | Innlandet, Norway | 8 | 1 | 0 | 2019-07-12 |
| Kirkebygden barne- og ungdomsskole | Akershus, Norway | 3 | 1 | 1 | 2022-09-16 |
| Doris Brekke | Telemark, Norway | 1 | 1 | 3 | 2010-06-30 |