A plant of the buttercup family that grows in marshes and ditches, with thick hollow stems and long narrow spear-shaped leaves.
- Genus Ranunculus, family Rununculaceae: the lesser spearwort (R. flammula) and the less common greater spearwort (R. lingua)
- The whole plant spearwort buttercup has agents that strongly causes reddening or irritation when applied to the skin.
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