Actually I believe the plant is angular ground cherry, Physalis angulata. Richard C. In a message dated 9/3/2010 1:28:49 P.M. Central Daylight Time, Rconnorsphoto@xxxxxxx writes: In the Dover area, across from Ft Donelson, at Barkley WMA Dainty Sulfurs were common in the low weedy flowers they seem to prefer. Not sure what species the plant is, small yellow flower, not ground cherry but slightly similar. I'll have to check a weed guide, could not find in wildflower book.