No one has answered, I see. I don't know, but I think it's possible it may be a type of sunflower. There's a native sunflower here with a vegetative growth habit that's much like what is shown in your photo. I've been told by knowledgeable people that it's excellent wildlife food, especially for birds. There usually are a few clumps that show up here in the pasture. I've never seen it grow as tall as the common sunflower plant. It has multiple stems unlike the common ones and with narrow leaves closer together on the stem than common sunflower plants. I think it may find it's way into some birdseed mixes, but I'm not sure why I think that.
You might check out photos for Helianthus maximiliani
