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Any of several plants of the genus Ranunculus of the buttercup family, having lance-shaped leaves and yellow flowers.
(Plants) any of several Eurasian ranunculaceous plants of the genus Ranunculus, such as R. flammula (lesser spearwort) and R. lingua (great spearwort), which grow in wet places and have long narrow leaves and yellow flowers. See also buttercup
any of several buttercups having lance-shaped leaves and small flowers, as Ranunculus ambigens, of the eastern U.S., growing in mud.