Wish I lived closer to DesPlaines - Used to have these all the time in my garden In Ripon, Wisconsin - Had also blue and pure white (no color in center), yellow and even a red variety - Don't remember where that one came from. Most of them came from the woods somewhere - In Wisconsin we also had a "Birds Foot Violet" with large blue flowers and fringy leaves - It came from Waushara County where the soil is more sand than dirt but I did raise some of them in Ripon in the regular black soil and they also did very well.
I moved away from Wisconsin for several years and now I am back in Wisconsin and live in Oshkosh, Wisconsin - So far all I have found here is a tiny blue violet with rather round leaves and white centers growing in the lawn - dug some up and they are blooming well in the garden with my hens and chicks etc. Violets are beautiful for spring.
If the first one is like the ones I have there may be two different types of seed pods. The one where the flower forms and another that forms at the base with almost no stem. The bottom ones seem to have larger seeds. I let the plants spread themselves so I do not know if both are fertile.
Thanks for the input. Both have been thriving and spreading in my flower beds. The top one, much faster than the freckled one. In fact I have to dig out some of those in the top picture. I hate to compost them, but they have more than doubled, and I need that space for other things.