This is a wild flower called vetch .. there are a number of different varieties that grow in Minnesota. I hear it is from the pea family and I am sure it has a more scientific species name, but I simply call it “the purple one”. It is easy to find a yellow/white variety and a pink one in the area, also. However, “the purple one” is growing like crazy this year. It is everywhere, it’s colors seem extra bright, and they seem to be larger as there are more individual flower pods making up each grouping (maybe the brightness of color is due to the fact that we are still under cloudy gray skies most of the time).
Like the lady slippers, these flowers obviously like our wet conditions as they are flourishing, too. (click to see full-sized images)