Spotting

This may be either Trillium sessile, a/k/a Toadshade, or Trillium cuneatum, a/k/a Sweet Betsy. When the bloom is not long and extended, I have trouble distinguishing these species, but this article may help you.

http://www.friendsofthewildflowergarden....

Not 100% about my suggestion because I'm not in your region, but it definitely looks like Trillium family and toadshade comes up with a similar leaf and flower coloration