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''Ranunculus lingua'', the greater spearwort, great spearwort, tongue-leaved crowfoot, or water buttercup, is a plant species in the family Ranunculaceae native to temperate areas of Europe, Siberia and through to the western Himalayas. It is a semiaquatic plant that prefers to grow in about of water in a variety of wetland habitats. A cultivar (or perhaps a traditional variety) called 'Grandiflorus', the large-flowered greater spearwort, has 6cm flowers and is favored by gardeners.
References
{{Authority control lingua Flora of Europe Flora of Siberia Flora of Central Asia Flora of West Himalaya Garden plants of Europe