A very common narrow-leaved buttercup of wet situations - wet meadows and pasture, fens, swamps, lake edges, canals and river banks etc. Rather like a small version of the greater spearwort (Ranunculus flammula), which is much rarer.
This species is very variable in size and habit. Some forms are more or less prostrate, rooting at the nodes and creeping; others are erect-growing.
All names: Ranunculus flammula L.