I took this plant’s photo during November 2016 at Saluda Shoals Park near the Saluda River north of the River Birch Shelter.
I noticed the stem had edges but there was no scent form the leaves. The leaves did not look like the mint family leaves.
The plant grew among other wild plants in a shaded area with some morning sun.
This looks like an injured Eupatorium, or Joe-pye-weed, in the Aster family, Asteraceae. The white areas appear to be the result of an herbicide spray, perhaps, or a mutation. Please feel free to submit this when it gets bigger for a confirmation, especially when it flowers.
Steve Hill, Botanist, SCNPS