Fall sunflower

Here is one of the plants, fairly common in the park. It has a distinct leaf arrangement under, what is now, a single died bloom. 2 opposite leaves alternate up the stem at 90 deg. angles to each other.  Fascinating.  I'm thinkin' this is a downy sunflower. 

One of my favorite wild flowers on the south end of the big prairie. You can see now when the green is all gone; the patches of gray among the darker cone flowers.