Lesser Celandine (Ranunculus ficaria)

I was looking on the internet to find the name of this flower and found out that William Wordsworth wrote a poem on it and below is the first verse.

The Small Celandine - William Wordsworth

There is a Flower, the Lesser Celandine,
That shrinks, like many more, from cold and rain;
And, at the first moment that the sun may shine,
Bright as the sun itself, 'tis out again!