Sorry couldn’t get better pictures. This plant is growing in Darlington county right on the edge of a creek. It is in dark moist soil. This summer there were blackberry bushes growing there and I bush hogged them and sprayed the area for a deer stand. These plants grew up since then and the deer are eating the heck out of them.
I’m afraid I cannot see much in this picture that helps me. If you have a chance to get one in better focus, send it. I can only guess at this time that your plant is Solanum nigrum or a similar species like Solanum ptychanthum in the same family as the tomato. Look at some internet pictures and let me know what you think. See also: http://plants.usda.gov/core/profile?symbol=sopt7
Steven R. Hill, Ph.D., Botanist, SCNPS