Name: Evan Pioneer Valley south, MA, USA (Zone 6a)
The description at Joy Creek seems to match up with Arisaema thunbergii ssp. urashima, but I think their photo is of Cobra Lily (Arisaema ringens)
A nice color form too but it has 2 leaves while A. thunbergii ssp. urashima has one. http://www.joycreek.com/Arisae...