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  1. Azolla filiculoides Lam. – Water Fern non-native

    Species, Fern, Freshwater

    Rhedynen y Dŵr, Rhedyn y Dŵr

    Species list: Wildlife and Countryside Act 1981 - Schedule 9 (GB)

    Species list: INNS - Wales Priority Species for Action

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  2. Crassula helmsii (Kirk) Cockayne – New Zealand Pigmyweed non-native

    Species, Flowering plant, Freshwater

    New Zealand Pygmyweed, Corchwyn Seland Newydd, mion-luibh Shealainn Nuaidh

    Species list: Wildlife and Countryside Act 1981 - Schedule 9 (GB)

    Species list: INNS - Wales Priority Species for Action

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  3. Elodea nuttallii (Planch.) H. St. John – Nuttall's Waterweed non-native

    Species, Flowering plant, Freshwater

    Nuttall's Water-Weed, Esthwaite Water-Weed, Alaw Nuttall, Ffugalaw Nuttall

    Species list: EU Invasive Alien Species Regulation

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  4. Fallopia japonica (Houtt.) Ronse Decr. – Japanese Knotweed non-native

    Species, Flowering plant, Freshwater, terrestrial

    Clymog Japan

    Species list: Wildlife and Countryside Act 1981 - Schedule 9 (GB)

    Species list: INNS - Wales Priority Species for Action

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  5. Fallopia japonica x sachalinensis = F. x bohemica (Chrtek & Chrtková) J.P. Bailey non-native

    Species hybrid, Flowering plant, Freshwater, terrestrial

    Species list: Wildlife and Countryside Act 1981 - Schedule 9 (GB)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

  6. Fallopia sachalinensis (F. Schmidt) Ronse Decr. – Giant Knotweed non-native

    Species, Flowering plant, Freshwater, terrestrial

    Clymog Sachalin, Y Glymog Fawr

    Species list: Wildlife and Countryside Act 1981 - Schedule 9 (GB)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

    Species list: INNS Alert list for Northern Ireland

  7. Gunnera manicata Linden ex André – Brazilian Giant-rhubarb non-native

    Species, Flowering plant, Terrestrial

    Brazilian Giant Rhubarb, Rheonllys Mawr Brasil, Rheonllys Pigog

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: INNS Alert list for Northern Ireland

  8. Gunnera tinctoria (Molina) Mirb. – Giant-rhubarb non-native

    Species, Flowering plant, Freshwater, terrestrial

    Giant Rhubarb, Rheonllys Mawr

    Species list: EU Invasive Alien Species Regulation

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  9. Heracleum mantegazzianum Sommier & Levier – Giant Hogweed non-native

    Species, Flowering plant, Freshwater, terrestrial

    Efwr Enfawr

    Species list: INNS - Wales Priority Species for Action

    Species list: EU Invasive Alien Species Regulation

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  10. Hydrocotyle ranunculoides L. f. – Floating Pennywort non-native

    Species, Flowering plant, Freshwater

    Dail-Ceiniog Arnofiol

    Species list: INNS - Wales Priority Species for Action

    Species list: EU Invasive Alien Species Regulation

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  11. Impatiens glandulifera Royle – Himalayan Balsam non-native

    Species, Flowering plant, Freshwater, terrestrial

    Indian Balsam, Policeman's Helmet, Penwisg Ddur Heddwas, Cap Dur Heddwas, Ffromlys Chwarennog, Jac y Neidiwr

    Species list: INNS - Wales Priority Species for Action

    Species list: EU Invasive Alien Species Regulation

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  12. Lagarosiphon major (Ridl.) Moss ex V.A. Wager – Curly Waterweed non-native

    Species, Flowering plant, Freshwater

    Pib-Flodyn Crych, Ffugalaw Crych

    Species list: INNS - Wales Priority Species for Action

    Species list: EU Invasive Alien Species Regulation

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: WFD UKTAG Alarm species

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

    Species list: WFD UKTAG 2015 Alien Species Alarm list

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  13. Ludwigia grandiflora (Michx.) Greuter & Burdet – Water Primrose non-native

    Species, Flowering plant, Freshwater

    Species list: INNS - Wales Priority Species for Action

    Species list: EU Invasive Alien Species Regulation

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  14. Ludwigia grandiflora subsp. hexapetala (Hook. & Arn.) G.L. Nesom & Kartesz – Uruguayan Hampshire-purslane non-native

    Subspecies, Flowering plant, Freshwater

    Species list: GB NNSS Alert species

    Species list: EU Invasive Alien Species Regulation

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: Contingency plan species for Wales

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  15. Lysichiton americanus Hultén & H. St. John – American Skunk-cabbage non-native

    Species, Flowering plant, Freshwater, terrestrial

    Skunk Cabbage, Pidyn-y-Gog Americanaidd

    Species list: INNS - Wales Priority Species for Action

    Species list: EU Invasive Alien Species Regulation

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  16. Myriophyllum aquaticum (Vell.) Verdc. – Parrot's-feather non-native

    Species, Flowering plant, Freshwater

    Parrot's Feather, Pluen Parot

    Species list: INNS - Wales Priority Species for Action

    Species list: EU Invasive Alien Species Regulation

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  17. Myriophyllum heterophyllum Michx. – Various-leaved Water-milfoil non-native

    Species, Flowering plant, Freshwater

    Water-Milfoil

    Species list: GB NNSS Alert species

    Species list: INNS - Wales Priority Species for Action

    Species list: EU Invasive Alien Species Regulation

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: Contingency plan species for Wales

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: WFD UKTAG Alarm species

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Alien Species Alarm list

    Species list: INNS Alert list for Northern Ireland

  18. Persicaria wallichii Greuter & Burdet – Himalayan Knotweed non-native

    Species, Flowering plant, Freshwater, terrestrial

    Clymog yr Himalaya, Y Ganwraidd Himalaiaidd

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Aquatic Alien Species for Ireland

    Species list: INNS Alert list for Northern Ireland

  19. Rhododendron ponticum L. – Rhododendron non-native

    Species, Flowering plant, Freshwater, terrestrial

    Rhododendron Wyllt

    Species list: Wildlife and Countryside Act 1981 - Schedule 9 (GB)

    Species list: INNS - Wales Priority Species for Action

    Species list: NRW Sustainable Management of Natural Resources (SMNR)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: INNS Alert list for Northern Ireland

    Species list: Invasive Species Northern Ireland

  20. Rhododendron ponticum x Rhododendron maximum

    Species hybrid, Flowering plant, Freshwater

    Species list: Wildlife and Countryside Act 1981 - Schedule 9 (GB)

    Species list: INNS - Wales Priority Species for Action

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland