Ficaria verna
This is Ficaria verna, formerly known as Ranunculus ficaria, commonly called the fig buttercup or lesser celandine. It is a weed and is listed as a noxious weed by a bunch of states and banned in at least two. It’s growing wild in the area around the pond next to my building. I’ve had enough experience with invasive weeds that I understand the desire to keep them out so I wouldn’t ever plant this. Nevertheless, I can appreciate the beautiful, bright yellow flowers. It is a tuberous rooted, herbaceous perennial native to western and central Asia and Europe. After flowering, the leaves die back by early summer and the plant goes dormant until the next spring.