Velvetleaf [Abutilon theophrasti] photo was taken in a cornfield behind Fletcher Park on 1 September 2014. All About Weeds, by Edwin Rollin Spencer says this about the plant, on page 158:
Velvet-leaf, velvet-weed, Indian mallow, butter print, pie plant, Cotton-weed, and Indian hemp are all rather descriptive names of this common weed found in cornfields throughout the Mississippi Valley. The weed has velvety leaves, and its seed pod looks very much like the print block used by farm housewives for stamping their rolls of butter.
You can see the butter print pattern pretty well with these dried pods.
USDA Plants Listing: Abutilon theophrasti