Symplocarpus foetidus
arcangelo wessells (Sun, 07 Apr 2013 21:46:49 PDT)
Arum rupicola var. virescens also generates heat when it blooms. They bloom in the evening, usually around the end of april, with a nice manure smell and when you put your nose up to them a shocking burst of warmth.
I couldn't find a photo of my plants, but here is one off the web:
Hi Ellen-
Another neat fact about them is that they will generate their own heat to
push up through the snow. They are native here in IL too. I was too busy
to see if this fact is true- we had late enough snow.