Trees, Shrubs and Conifers: Are witch hazels grafted?, 1 by Cearbhaill

Cearbhaill wrote:
I have a HAMAMELIS x intermedia 'Rochester' from http://www.rarefindnursery.com/index.cfm/action/productdetai... that is sending up some basal shoots. The leaves do not look exactly like the leaves further up (they are more bronze, more serrated, and pointier) and I don't know whether this is rootstock sprouting or just juvenile leaves.

Could this plant be grafted? There is a bit of an odd looking area near the base- right above the new shoots.
Here is the "maybe grafted?" area...