There is a couple Asian Wingnut species growing near each other.
The one in the foreground is a Japanese Wingnut. It has been the hardiest Wingnut I have grown. The one on the left hand side is the Hupeh Wingnut. This Wingnut has been hardy to at least -15F. When it has gotten colder than -20F, it has had severe dieback, but it does grow back with a vengeance.