Wildflower Wednesday

When we built our house above Heck Creek in western NC a few years ago, I was dismayed to see how much bare red clay we were left with after construction.   Very few plants seem to be able to establish themselves on our badly eroding banks, but there are 2 plants that seem quite happy to grow there.  I haven't identified these plants other than that they are aster-daisy-sunflower family members.  Any ideas?

Both plants are perennial, over-wintering as a basal rosette, and reach 5 to 7 feet tall in the summer. Here they are growing on a clay bank.

The first plant, with smooth stems with no leaves on the stems.

Basal leaves,lobed and smooth.

Close-up of the flowers.  About 1inch in diameter.

Second plant, basal leaves.  It has hairy stems and a few leaves on the stems.

Close-up of the flowers, 2 to 3 inches in diameter, with hairy stems and leaves.

I'm linking this post to Gail Eichelberger's "Wildflower Wednesday" at Clay and Limestone .



Edited to add:  I'm almost 100% sure the plant with the smaller flowers and smooth stems is Silphium compositum.   The other plant will just be "sunflowerish plant"  for now.