I can see possibly a variation of Himalayan mayapple, but not the American species, at least from all the photos in the NGA database, and ones I looked on googled sources. Still guessing neither, though.
When the debate is lost, slander becomes the tool of the losers. - Socrates
Coltsfoot, this is exactly what it is! One thing about Coltsfoot is the flowers appear before the leaves. I had just posted a separate ID request at the same time for the flowers, which was also identified as Arctic Coltsfoot (Petasites frigidus). Now it all makes sense, mystery solved!