If you remember this post, I promised to post more pictures as I identified them. Well here they are. I'm no expert, yet, but I referenced several books and website for my identification and then checked the list of vascular plants that the part provides. Here is what I came up with.
These are MayApple (Podophyllum peltatum)
The flowers hide under the leaves.
I believe this is a Mockernut Hickory tree (Carya alba)
This one, the only one I saw all day, is Catsby's Trillium (Trillium catesbaei)
A better view of the flower
and last but not least, I think this one is a Yellow Morel (Morchella)