HelpfulGardener.com

https://www.state.nj.us/dep/newsrel/2010/10_0060.htm

https://centerforplantconservation.org/Collection/CPC_ViewProfile.asp?CPCNum=4351

I have quite a few on my property and each year more pop up. I believe they were growing the fringe of the woods at the back of my property. This is where the chipper is and I probably carried the seeds from the chipper pile to my garden. I never knew exactly what they were but liked them.

Given how rare they are saying this is, if you really think you have some "popping up" in your yard, you should report it to the center for plant conservation that you linked to.

there is a non-native globeflower that looks pretty similar:

https://davesgarden.com/guides/pf/showimage/8586/

The non-native is showier than what I have. This is a better picture. Looks exactly like what I have.

https://www.alpiner.se/images/Trollius%20laxus%20hs.jpg

I have someone coming over Sunday who is a botany professor at Rutger's. Not his area of expertise in botany but he might be able to direct me to the right person.