Lysimachia puntata, commonly known as yellow loosestrife, though it's not actually in the loosestrife family.

Not sure where you are, but I put this in a small bed last year, and it was really nice - - - I'm very much hoping it comes back up here just a little north of Boston!
Lynn

L. punctata.

KPin, if on the W side of the state, you might find this a little aggressive in your garden. The variegated forms with the same yellow flower better behaved.

KP is inOregon. It is not the same as purple loosestrife, but may still spread by seed and rhizomes, especially west of the Cascade Mountains.

Around here it is native, and you can have something else in a boder or L punctata, a horrible, bullying spreader

Re Linaria's comment:

I've also been very wary of Lysimachia punctata, but occasionally used it.

I planted it in a perennial garden (full sun, upgraded clay soil)) (installed in 2000) and have maintained that garden to date.

I did get worried about it spreading, so put it in a pot in the soil, but found that it would not stay in. On the other hand, I've subsequently simply reduced it (pulling up/spading out runners), yearly after flowering, and had no problem maintaining it more or less in the same location.

As per Morz: a variegated form ('Alexander') was present in another garden (semi-shade, upgraded clay soil) I maintained over about five years. It spread very minimally. I don't know how much of that was related to a contrast between variegated and non-variegated forms of the same plant (viz. more versus less vigorous) and how much was to do with it's semi-shade location.

I wouldn't use any L. punctata in our own mixed perennial beds, because too many plants are maintained too close together.

Has never spread for me. Naturally acid, sandy soil, and mostly shade. 20 years in the same spot.
But that must be hardly characteristic of the plant.