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Saxifraga umbrosa x hirsuta = S. x geum – Scarce Londonpride non-native
Species hybrid, Flowering plant, Terrestrial
Balchder Llundain Prin
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Saxifraga umbrosa x spathularis = S. x urbium – Londonpride non-native
Species hybrid, Flowering plant, Freshwater, terrestrial
London Pride, Balchder Llundain
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Sedum spectabile x telephium = S. 'Herbstfreude' – Autumn Stonecrop non-native
Species hybrid, Flowering plant, Terrestrial
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Spartina maritima x alterniflora = S. x townsendii – Townsend's Cord-grass non-native
Species hybrid, Flowering plant, Terrestrial
Spartina Townsend, Spartina, Cordwellt Townsend
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Spiraea alba x douglasii = S. x billardii – Billard's Bridewort non-native
Species hybrid, Flowering plant, Terrestrial
Erwain Billard
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Spiraea cantoniensis x trilobata = S. x vanhouttei – Van Houtte's Spiraea non-native
Species hybrid, Flowering plant, Terrestrial
Van Hotte's Spiraea, Erwain Van Houtte
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Spiraea douglasii x canescens = S. x brachybotrys – Lange's Spiraea non-native
Species hybrid, Flowering plant, Terrestrial
Erwain Lange
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Spiraea multiflora x thunbergii = S. x arguta – Bridal-spray non-native
Species hybrid, Flowering plant, Terrestrial
Bridalspray, Erwain y Briodferch
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Spiraea salicifolia x alba = S. x rosalba – Intermediate Bridewort non-native
Species hybrid, Flowering plant, Freshwater, terrestrial
Erwain Gwridog
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Spiraea salicifolia x douglasii = S. x pseudosalicifolia – Confused Bridewort non-native
Species hybrid, Flowering plant, Freshwater, terrestrial
Ffug Erwain-Dail-Helyg
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Symphoricarpos albus x microphyllus x orbicularis (S. x doorenbosii) non-native
Species hybrid, Flowering plant, Terrestrial
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Symphoricarpos microphyllus x orbiculatus = S. x chenaultii – Hybrid Coralberry non-native
Species hybrid, Flowering plant, Terrestrial
Pink Snowberry, Llusen Gwrel Groesryw
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Symphytum asperum x orientale (S. x norvicense) – Norfolk Comfrey non-native
Species hybrid, Flowering plant, Terrestrial
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Symphytum officinale x asperum = S. x uplandicum – Russian Comfrey non-native
Species hybrid, Flowering plant, Freshwater, terrestrial
Cyfardwf Glas, Cyfardwf Rwsia
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Symphytum officinale x asperum x grandiflorum = S. 'Hidcote Blue' – Hidcote Comfrey non-native
Species hybrid, Flowering plant, Freshwater, terrestrial
Cyfardwf Hidcote
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Veronica longifolia x spicata non-native
Species hybrid, Flowering plant, Terrestrial
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Viburnum lantana x rhytidophyllum = V. x rhytidophylloides non-native
Species hybrid, Flowering plant, Terrestrial
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Viola lutea x tricolor x altaica = V. x wittrockiana – Garden Pansy non-native
Species hybrid, Flowering plant, Terrestrial
Pansi, Trilliw'r Gerddi