Best time to see: Jun to Sep

Key facts

An unusual buttercup found in marshy places, beside streams and on pond margins

Once common but now, like the wetlands it favours, few and far between

Leaves or roots ground with salt blister the skin and were once used to treat the sores caused by bubonic plague

Extras

Low-growing perennial with short narrow leaves, sometimes creeping and rooting at leaf junctions

Bright yellow flowers, 7–20 mm, with furrowed stalks