Guys: I had this 5 year root transplanted from the field to my pilot garden last fall and it gives me only four prongs, but with 6 or 7 leave prongs. Look carefully at the leaves. Do you see this in the wild?
You are right, those are not uniform leave. However that plant is very nice looking!
Now that I know what to look for in the past couple of years, I identify wild grown plants when I see them.. Two weeks ago, I was hiking in the Linville gorge of NC. I saw several really nice looking plants, however not as nice as the photo you posted.