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  1. Egeria Planch.

    Genus, Flowering plant

  2. Egeria densa Planch. – Large-flowered Waterweed non-native

    Species, Flowering plant, Freshwater

    Ffugalaw Prinflodeuog, Alaw Prin-Flodeuog

    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

  3. Egeria najas Planch. non-native

    Species, Flowering plant, Terrestrial

    Species list: INNS of Interest to Wales June 2022

    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

  4. Elodea Michx. – Waterweed

    Genus, Flowering plant, Freshwater, terrestrial

  5. Elodea callitrichoides (Rich.) Casp. – South American Waterweed non-native

    Species, Flowering plant, Freshwater

    South-American Water-Weed, Ffugalaw De America, Alaw De America

    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

  6. Elodea canadensis Michx. – Canadian Waterweed non-native

    Species, Flowering plant, Freshwater

    Canadian Pondweed, Teim y Dŵr, Ffugalaw Canada, Alaw Canada

    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

  7. Elodea canadensis/nutallii

    Species aggregate, Flowering plant, Terrestrial

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

    Species list: INNS of Interest to Wales June 2022

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

    Species, Flowering plant, Freshwater

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

  9. Hydrilla Rich.

    Genus, Flowering plant

  10. Hydrilla lithuanica Dandy pro parte

    Species pro parte, Flowering plant

  11. Hydrilla verticillata (L. f.) Royle – Esthwaite Waterweed

    Species, Flowering plant, Freshwater

    Hydrilla, Ffugalaw Gwelw, Alaw Gwelw

  12. Hydrocharis L.

    Genus, Flowering plant

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

    Species list: WFD UKTAG 2015 Alien Species Alarm list

  13. Hydrocharis morsus-ranae L. – Frogbit

    Species, Flowering plant, Freshwater

    Ffugalaw Bach

  14. Lagarosiphon Harv.

    Genus, Flowering plant

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

    Species, Flowering plant, Freshwater

    Ffugalaw Crych, Pib-Flodyn 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 Ireland

  16. Najas L.

    Genus, Flowering plant, Freshwater

  17. Najas flexilis (Willd.) Rostk. & W.L.E. Schmidt – Slender Naiad

    Species, Flowering plant, Freshwater

    Naiad Ystwyth, Naiadau Ystwyth, Nymff Ystwyth

  18. Najas graminea Delile – Naiad non-native

    Species, Flowering plant, Freshwater

  19. Najas marina L. – Holly-leaved Naiad

    Species, Flowering plant, Freshwater

    Hollyweed, Naiad Arfor, Naiadau Arfor, Nymff Arfor

  20. Najas marina subsp. intermedia (Wolfg. ex Gorski) Casper

    Subspecies, Flowering plant, Freshwater