We have these plants all over the place and I think they are burdocks, but I am not 100% sure. The leaves are toothed rather than leaf shaped and the down is white rather than purple. I can see no other plant in my book that comes anywhere near it in habit though, the leaves atop the stalk remain wrapped around the thistles for a long time until they burst open....I think you can click on the photos to enlarge.....
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