Rheum ×rhabarbarum
| Participant | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. |
|---|---|---|---|---|---|
| Cicignon skole | Østfold, Norway | 2 | 1 | 0 | 2013-09-05 |
| Per Torgersen | Akershus, Norway | 2 | 1 | 0 | 2019-05-27 |
| Bråte skole | Akershus, Norway | 1 | 1 | 0 | 2023-04-13 |
| Bratsbergkleiva skole | Telemark, Norway | 1 | 1 | 0 | 2020-03-25 |