St. John's wort would be my guess. Some are native, not sure this one is. FWIW, the stuff they call St. John's wort in England could be something else.

Yes agree. I do pull them but I find them quite attractive, otherwise I have many more.

It's a Hypericum species. There are 111+ Hypericum species in the US. Some are showy and used as ornamentals. Others are grown by native plant gardeners. A few are non native and invasive. They certainly cant be all lumped together and treated the same way.

Dandy_line, can you check the underside of the leaves to see it there are black dots near the margins?

FFR Potentilla would not have opposite foliage, nor the prominent central boss of stamens.

Hi Jay. There are no dots on the petals, front or back.

It's the leaves that have the dots. Hypericum perfoliatum is the most common species in your county.

Do you mean perforatum? The notorious European weed?

Ooops sorry, you're correct, I meant the invasive perforatum. It's the most common species in your county.

Here's a pic of H. perforatum on my place. Identified by our local Noxious Weeds Board, so I'll take them at their word! Some years I have acres of the stuff, then it disappears for a couple of years. But always returns...

I've seen perforatum around my area.

These are 2 nice native Hpericum. On the left is Hypericum prolificum and the plant on the right was purchased as Hypericum kalmianum, but it's not kalmianum.

Hello Jay. The leaves are only about 6mm long but I checked them again this AM with a magnifying glass but cannot discern any spots.

I thought St Johns Wart was supposed to be woody but these are not.

Some Hypericum species are woody and others arent. I'm pretty sure the perforatum around here dies back completely to the ground in winter. My 2 native species are woody. Aren't you growing any native Hypericum species? I can look into more posabilities of what species this is, but it's time consuming and sometimes the only way to ID them is by examining the dried seed heads. That's the story with my 'kalmianum'. The best botanists were looking at it, but it could'nt be ID'd without viewing the seed heads. There are native Hypericum in your area. A friend is giving me a red flowering Marsh St. Johns Wort, and the red flowering species have been split off into Triadenum.

That sounds cool. Is that the H. virginicum? Prairie Moon lists it but seeds are currently not in stock. I know where there are some swamp Hypericum near here but they aren't red flowered. I've been growing the H prolificum from seed.

I don't know what species my SJW on the right is. I have to go back and check some old posts, but I'm certain the suggestion I was given wasn't H. virginicum. They take up about 3 feet of space, and are better treated as small shrubs, so I don't have enough space to add more, except the bog loving Triadenums. Here's a key.

Hypericum perforatum has black spots only along the margins of the petals. It's the petals, not the leaves. That was bad information from a sight. Perforatum also has single stems instead of being woody. Hypericum punctatum has black spots all over the petals. Not every perforatum flower has the black spots, so you may need to look at several.

Thanks floral. I was confused about the leaves vs petals, but I did read about the translucent dots on the leaves, and then promptly forgot.