Oops, sorry: neither. I went to Google Images and typed in rabbit tobacco. I've seen the tall spindly one often, without knowing what it was. I would never have thought it was the same plant as that nasty-looking thing lying along the ground.
Here's the Google Images link to Nicotiana sylvestris:
http://images.google.com/images?q=Nicotiana+sylvestris&ie=UTF-8&hl=en&btnG=Google+Search

And for Gnaphalium obtusifolium:
http://images.google.com/images?hl=en&lr=&ie=UTF-8&q=Gnaphalium+obtusifolium