29 September 2009: What are scuppernongs???

The question from the weekend's race in Augusta......$1/lb pick your own scuppernongs.........a sign by the road out on the bike course. I have no idea what they are - or even if I am revealing my total ignorance or merely the fact that I am not from Georgia/Sth Carolina. In fact I don't actually know what state that sign was in as I believe that at some point during the race we did cross the border??