We have several of these plants growing on our property in upper Pickens County, SC.
They are in a mixed hardwood forest, 15-20 feet from a small spring, and are in moderate shade.
This photo was taken in April but the plants are still about the same size (10-12 inches tall) and I have not seen any flowers. The knife in the photo is 4 inches long.
Your plant is a young individual of Dioscorea quaternata, a relative of the true yam, Dioscorea, but it does not grow a large tuber. ‘quaternata’ means ‘in four parts’ because the young plants typically have 4 leaves before they grow into vines. It is occasional in the upstate. It has been used medicinally: http://www.localharvest.org/wild-yam-dioscorea-quaternata-C11912 and more can be found here: http://www.missouriplants.com/Greenopp/Dioscorea_quaternata_page.html
Dr. Steven R. Hill, Botanist, SCNPS, in the wilds of Walhalla…