Persicaria hydropiper (Water-pepper)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Kolbjørnviksjøen | Østfold, Norway | 1 | 1 | 0 | 1989-09-01 | |
| Ledengstjern | Østfold, Norway | 1 | 1 | 0 | 1994-05-27 | |
| Moahaugen (haugen bak Ytrebygda skole) | Vestland, Norway | 1 | 1 | 0 | 2014-05-16 | |
| Storavatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-26 | |
| Sørmarkveien | Rogaland, Norway | 2 | 1 | 0 | 2020-09-08 |