Genus: Reynoutria
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Tertnestjørna | Vestland, Norway | 1 | 1 | 1 | 2020-09-28 | |
| Tingvoll | Rogaland, Norway | 1 | 1 | 1 | 2020-09-29 | |
| Tjodalyng barne- og ungdomsskole | Vestfold, Norway | 1 | 1 | 1 | 2015-05-27 | |
| Tonningsleiren | Vestland, Norway | 1 | 1 | 1 | 2021-08-27 | |
| Torstaddammen | Akershus, Norway | 1 | 1 | 0 | 2015-06-09 | |
| Trollringen | Troms, Norway | 1 | 1 | 1 | 2020-09-21 | |
| Tunga | Vestland, Norway | 4 | 1 | 4 | 2023-08-29 | |
| Tveidevik | Rogaland, Norway | 1 | 1 | 1 | 2020-09-12 | |
| Tveiteskogen (Askøy) | Vestland, Norway | 2 | 1 | 0 | 2020-01-15 | |
| Tveitevannet | Vestland, Norway | 2 | 1 | 2 | 2014-05-22 | |
| Tveitevågen | Vestland, Norway | 1 | 1 | 0 | 2017-06-24 | |
| Ullern vgs | Oslo, Norway | 3 | 1 | 0 | 2017-09-04 | |
| Uteområdet ved Frogn vgs | Akershus, Norway | 1 | 1 | 2 | 2016-08-30 | |
| Vassdalen | Vestland, Norway | 1 | 1 | 1 | 2024-05-31 | |
| Vassverktjørna | Rogaland, Norway | 1 | 1 | 1 | 2021-09-10 | |
| Vellene | Vestland, Norway | 1 | 1 | 1 | 2020-09-21 | |
| Votlo/Askeland | Vestland, Norway | 1 | 1 | 1 | 2015-05-30 | |
| Vågsbygd Ringvei 21 | Agder, Norway | 1 | 1 | 1 | 2016-08-07 | |
| Øvre Sæbø | Vestland, Norway | 1 | 1 | 1 | 2020-09-21 | |
| Øystese | Vestland, Norway | 2 | 1 | 4 | 2016-05-15 | |
| Øystese | Vestland, Norway | 1 | 1 | 1 | 2016-05-16 | |
| Øysteseelva | Vestland, Norway | 1 | 1 | 1 | 2016-05-16 | |
| Øysteseelva | Vestland, Norway | 1 | 1 | 1 | 2016-05-30 | |
| Åfossringen | Telemark, Norway | 1 | 1 | 1 | 2020-09-29 | |
| Åna | Møre og Romsdal, Norway | 1 | 1 | 1 | 2020-09-29 | |
| Åndalsnes | Møre og Romsdal, Norway | 2 | 1 | 2 | 2015-06-10 | |
| Åsheim | Vestland, Norway | 1 | 1 | 0 | 2015-05-30 |
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