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Polygonum arenarium subsp. pulchellum
Subspecies, Flowering plant
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Polygonum aviculare – Knotgrass
Species, Flowering plant, Freshwater
Knotgrass agg., Clymog, Y Canclwm, Berw'r Ieir, Berwr yr Iâr, Canclwm, Berw'r Iâ, Gwaedlys, Llysiau y Milwr, Clymlys, Treigledlys
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Polygonum aviculare agg.
Species sensu lato, Flowering plant, Freshwater
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Polygonum bellardii
Species, Flowering plant
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Polygonum boreale – Northern Knotgrass
Species, Flowering plant
Canclwm y Gogledd
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Polygonum corrigioloides
Species, Flowering plant
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Polygonum equisetiforme
Species, Flowering plant
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Polygonum graminifolium
Species, Flowering plant
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Polygonum maritimum – Sea Knotgrass
Species, Flowering plant
Canclwm Arfor, Canclwm yr Arfor
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Polygonum oxyspermum – Ray's Knotgrass
Species, Flowering plant
Canclwm Ray, Clymog Eiddil Graean Garw
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Polygonum oxyspermum subsp. oxyspermum
Subspecies, Flowering plant
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Polygonum oxyspermum subsp. raii
Subspecies, Flowering plant
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Polygonum patulum – Red-knotgrass
Species, Flowering plant
Red Knotgrass, Y Canclwm Coch
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Polygonum plebejum – Small Knotweed
Species, Flowering plant
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