Ranunculus lingua, the greater spearwort,[2]great spearwort,[3]tongue-leaved crowfoot,[4] or water buttercup,[5] 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 40cm (16in) of water in a variety of wetland habitats.[6] A cultivar (or perhaps a traditional variety) called 'Grandiflorus', the large-flowered greater spearwort, has 6cm flowers and is favored by gardeners.[7]
Wiersema, John H.; León, Blanca (2016-04-19). World Economic Plants: A Standard Reference, Second Edition. p.579. ISBN9781466576810.
Catlow, Agnes (1852). Popular Field Botany: Containing a Familiar and Technical Description of the Plants Most Common to the Various Localities of the British Isles, Adapted to the Study of Either the Artificial or Natural Systems. London: Reeve and Co. p.301. OCLC7536831.
Loudon, J. C.; Loudon, Mrs. (1850). An Encyclopædia of Gardening; Comprising the Theory and Practice of Horticulture, Floriculture, Arboriculture, and Landscape Gardening; Including All the Latest Improvements; A General History of Gardening in All Countries; And a Statistical View of its Present State; With Suggestions for its Future Progress in the British Isles. London: Longman, Brown, Green, and Longmans. p.405. OCLC6858645.
Everett, Thomas H. (1963). New Illustrated Encyclopedia of Gardening, Unabridged. New York: Greystone Press. p.1765. OCLC23370502.
Rybka, Vlastik; Duchoslav, Martin (2007). "Influence of Water Depth on Growth and Reproduction of Ranunculus lingua". Belgian Journal of Botany. 140 (1): 130–135. JSTOR20794630.
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