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 Himalaya. It is a semiaquatic plant that prefers to grow in about 40 cm (16 in) of water in a variety of wetland habitats. A cultivar (or perhaps a traditional variety) called 'Grandiflorus', the large-flowered greater spearwort, has 6 cm flowers and is favored by gardeners.
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*All information is based on published scientific research