I collected this in September in Central Minnesota in a sand prairie. T had thought it was Cut-leaf toothwort but after I tried to identify realized I was wrong. Any help would be appreciated.
Unfortunately, there's only one picture of it in the database here. But, if you google "Viola pedatifida leaves", you'll find plenty of images to compare against your pressed samples.
I agree with Kent - As long as it has the same growth habit as the only other possibility (Viola pedata shown below):
(lower right quadrant)
Pic taken in a Washington County sand prairie.
When the debate is lost, slander becomes the tool of the losers. - Socrates
