There is a lot of this plant along the Waldrop Stone waterfall trail. It is in the shade and looks like a berry angular/boxey hydrangea. There flowers are about as big as a hydrangea.
Thank you for your help.
this is one of our native woodland milkweeds, Asclepias variegata. It is called the Redring milkweed or the White-flowered milkweed. I would say it is the most common woodland milkweed in the upstate, but it is not abundant where it is found.
Dr. Steven Hill, Botanist, SCNPS