Genus: Hønsegrasslekta (Persicaria)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Akersvannet | Vestfold, Norway | 2 | 1 | 0 | 1989-09-15 | |
| Bakketun | Innlandet, Norway | 3 | 1 | 0 | 2019-07-09 | |
| Estenstadmarka | Trøndelag, Norway | 2 | 1 | 0 | 2013-06-07 | |
| Gullerudtjern | Buskerud, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Harestuvannet | Akershus, Norway | 1 | 1 | 0 | 1990-09-04 | |
| Helsetvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 2004-09-06 | |
| Hopsvannet | Vestland, Norway | 1 | 1 | 0 | 2012-09-24 | |
| Hustoft gnr. 150/4 | Rogaland, Norway | 12 | 3 | 0 | 2024-06-30 | |
| Jarenvannet | Innlandet, Norway | 2 | 1 | 0 | 1990-08-28 | |
| Kolbjørnviksjøen | Østfold, Norway | 1 | 1 | 0 | 1989-09-01 | |
| Ledengstjern | Østfold, Norway | 1 | 1 | 0 | 1994-05-27 | |
| Ljøgodttjern | Akershus, Norway | 1 | 1 | 0 | 1989-09-21 | |
| Moahaugen (haugen bak Ytrebygda skole) | Vestland, Norway | 1 | 1 | 0 | 2014-05-16 | |
| Mølledammen i Lomma 1 | Akershus, Norway | 1 | 1 | 0 | 2008-10-22 | |
| Nøklevann | Oslo, Norway | 2 | 1 | 0 | 1989-10-04 | |
| Opsangervatnet | Vestland, Norway | 2 | 1 | 0 | 1993-06-09 | |
| Radarstasjonen | Vestland, Norway | 1 | 1 | 0 | 2010-09-21 | |
| Reinsvolldammen | Innlandet, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Rolfsbukta, Fornebu | Akershus, Norway | 1 | 1 | 0 | 2010-08-25 | |
| Sagåsen | Innlandet, Norway | 2 | 2 | 0 | 2013-07-07 | |
| Skarvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Stavsjø | Innlandet, Norway | 3 | 2 | 0 | 1989-09-05 | |
| Storavatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-26 | |
| Storvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2004-09-14 | |
| Storvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2004-08-14 | |
| Sørmarkveien | Rogaland, Norway | 2 | 1 | 0 | 2020-09-08 | |
| Tranevågen skule | Vestland, Norway | 1 | 1 | 0 | 2010-09-10 | |
| Ulfsbakktjønn | Vestfold, Norway | 2 | 1 | 0 | 1997-09-16 | |
| Vaksvik | Møre og Romsdal, Norway | 2 | 1 | 0 | 2020-07-07 | |
| Vansjø | Østfold, Norway | 1 | 1 | 0 | 2017-07-09 | |
| Årungen | Akershus, Norway | 2 | 1 | 0 | 1991-09-16 |