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Alisma gramineum – Ribbon-leaved Water-plantain
Species, Flowering plant, Freshwater
Ribbon-leaved water plantain, Dër-Lyriad Hirfain, Llyriad-y-Dŵr Hirfain, Dŵr-Lyriad Hirfain
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Alisma lanceolatum – Narrow-leaved Water-plantain
Species, Flowering plant, Freshwater
Narrow Water-Plantain, Dwfr Llyriad Culddail, Llyriad-y-Dŵr Culddail, Dŵr-Lyriad Culddail
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Alisma plantago-aquatica – Water-plantain
Species, Flowering plant, Freshwater
Common Water-Plantain, Water Plantain, Llyriad y Dŵr
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Baldellia ranunculoides – Lesser Water-plantain
Species, Flowering plant, Freshwater
Dŵr-Lyriad Bychan, Dyfr-Lyriad Bychan, Llyriad-y-Dŵr Bach, Llyren Fechan
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Butomus umbellatus – Flowering-rush
Species, Flowering plant, Freshwater
Flowering Rush, Brwynen Flodeuog, Engraff
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Damasonium alisma – Starfruit
Species, Flowering plant, Freshwater
Serffrwyth, Llyriad-y-Dŵr Sêr-Ffrwythog, Llyriaid-y-Dŵr Sêr-Ffrwythog
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Groenlandia densa – Opposite-leaved Pondweed
Species, Flowering plant, Freshwater
Opposite Pondweed, Dyfrllys Cyferbynol, Dyfrllys Cyferbynddail, Dyfrllys Tewdws
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Hydrilla verticillata – Esthwaite Waterweed
Species, Flowering plant, Freshwater
Hydrilla, Ffugalaw Gwelw, Alaw Gwelw
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Hydrocharis morsus-ranae – Frogbit
Species, Flowering plant, Freshwater
Ffugalaw Bach
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Lemna gibba – Fat Duckweed
Species, Flowering plant, Freshwater
Llinad y Dŵr Crythog, Llinhad y Dwfr Crythog, Llinad Crythog
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Lemna minor – Common Duckweed
Species, Flowering plant, Freshwater
Bwyd Hwyaid, Llinhad y Dŵr Lleiaf, Llinos y Dwfr, Bwyd-Hwyaid Bychan, Llinad y Dŵr, Llinad, Llinos y Dŵr, Llinad y Dŵr Lleiaf
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Lemna trisulca – Ivy-leaved Duckweed
Species, Flowering plant, Freshwater
Bwyd Hwyaid, Llinhad y Dŵr Eiddewddail, Dail Meillion y Dwfr, Llinad Dail Eiddew, Llinad Eiddew, Llinad y Dŵr Eiddewddail
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Luronium natans – Floating Water-plantain
Species, Flowering plant, Freshwater
Dwfr Llyriad Nofiadwy, Dyfr-Lyriad Nofiadwy, Llyriad-y-Dŵr Arnofiol, Dŵr-Lyriad Nofiadwy, Llyren Nofiadwy
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Najas flexilis – Slender Naiad
Species, Flowering plant, Freshwater
Naiad Ystwyth, Naiadau Ystwyth, Nymff Ystwyth
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Najas marina – Holly-leaved Naiad
Species, Flowering plant, Freshwater
Hollyweed, Naiad Arfor, Naiadau Arfor, Nymff Arfor
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Potamogeton acutifolius – Sharp-leaved Pondweed
Species, Flowering plant, Freshwater
Dyfrllys Meinddail, Dyfrllys Dail Llym, Dyfrllys Dail Llymion
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Potamogeton alpinus – Red Pondweed
Species, Flowering plant, Freshwater
Reddish Pondweed, Dyfrllys Coch
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Potamogeton berchtoldii – Small Pondweed
Species, Flowering plant, Freshwater
Slender Pondweed, Dyfrllys Bach, Dyfrllys Eiddil
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Potamogeton coloratus – Fen Pondweed
Species, Flowering plant, Freshwater
Plantain-Leaved Pondweed, Dyfrllys y Gors Galchog, Dyfrllys y Fignen
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Potamogeton compressus – Grass-wrack Pondweed
Species, Flowering plant, Freshwater
Wrack-Like Pondweed, Dyfrllys Cywasg, Dyfrllys Camlaswellt