Help ID-Is this St. John's Wort

I am really hoping it is, but I couldn't find any pictures that I could tell for sure. I know I put some seeds out, but not sure if they really did come up. There are a lot of times when I'm so hopeful I overlook obvious characteristics that would tell me it is not the plant I hope it to be.

This plant came up in our garden bed. We normally have very clayey soil on our property, but it is definitely a little loamier here in the garden

It's not Hypericum perforatum, which is the useful herbal St. John's Wort. Hypericum perforatum has long oval leaves and the flowers have tiny black dots on the margins. The flowers are also bright yellow.

There are numerous other garden plants sold as St. John's Wort, usually a Hypericum species, but I don't think that's anything Hypericum sp. That marking on the flowers in a distinct ring around the stamens is very striking. I don't have anything in my guides that matches it -- which doesn't mean much since my guides only cover this area.