Milkweed (Asclepias).  Didn’t see the plant in flower, so I can’t say which species.  October 28, Shenandoah National Park, parking lot at Riprap Hollow trailhead.

closeup of seeds

unripe pods not quite ready

fly!  be free!

I just love how they form little balloons as they’re getting ready to go…

…and embrace the sky