Lesser spearwort (Ranunculus flammula) is a member of the buttercup family and is a good British native creeping plant which has a long flowering period, producing masses of small yellow flowers from around April to July. It is mildly poisonous and can cause minor skin irritation.
Ranunculus little frog as they grow in wet places
Planting position: Pond marginal shelf up to 20cm deep or very wet soil. Sun or semi-shade.