I first found it near the Reddy River in southern Greenville county but have found it elsewhere in Anderson county. It is blueish purple about 16 inches high.
This plant is called blue mist flower, and the scientific name is Conoclinium coelestinum. It is a rather widespread native plant often found in moist ditches. I learned it as Eupatorium coelestinum. Some people call it Ageratum, but that is a different plant.
Sorry about the image, because you sent a nice complete image, but I am not in control of how the image is displayed on this site. Perhaps someone can help to allow me to manipulate the images.
Steven Hill, Ph.D., Botanist, SCNPS