Ficaria verna

At least according to https://images.google.com.
This plant was formerly as Ranunculus ficaria, but commonly known as lesser celandine or pilewort.
It is native here. And a sign that spring has come.
Although lovely for the eye, the plant is not good if taken in raw. Well, my parents taught me to leave anything I see in the wild, right there, in the wild.
Thanks to BikerBear for hosting the Flower Friday challenge.