I have never seen a salvia growing in the wild. That sure is what it looks like. My Missouri Wildflowers doesn't list any in the index.

Salvia lyrata

Here is a link that might be useful: Salvia Lyrata

Thank you Beerhog. : )
I checked the Grownative site and it didn't list any salvias either so I thought I might have something unusual but I guess not.
I do think it had time to go to seed so I hope it's not going to be a problem. I couldn't find anything about it being toxic to cattle. Maybe the hummingbirds will use it.

This one doesn't look like yours, but it is shown in my book to grow in your area. S. azurea is palatable and nutritious for all classes of livestock especially in spring according to Steyermark. Yours is closely related so I doubt it would hurt livestock. The only salvias shown in my book are lyrata, azurea, reflexa, and (sclarea escaped from cultivation near St. Louis). This is from my 1725 paged book Flora of Missouri. This one below looks very nice.

Here is a link that might be useful: salvia azurea

I couldn't get the link but Dave's G. has positive things to say about your salvia.

That's a big book Helen! I should see if they have that at the library. (maybe reference)
I really like salvias. There are many plants that bloom so long and require so little water.