Is it possible that it's goldenrod? I don't remember seeing any yellow flowers on it, but it does look like it had flowers that dried out. Sorry the pic is sideways.
Sorry, but it is very hard to tell from that picture what it is. Could we get a closer look and have it flipped right side up please?
Probably Conyza bonariensis. It still has few flowering heads seen under a high zoom. The flowers have short tiny rays, very inconspicuous. As I can judge from web images, it has less tendency to reflex the phyllaries after going to seeds, unlike C. canadensis.