... This tree is an Amur Corktree (phellodendron amurense). The bark feels like cork when you touch it. I guessed that it had to be a super soft wood. The arboretum guys said they lost two more of them and some woodturners asked them to save a few pieces for them. The wood was cracked so badly by the next day that it wasn't usable for turning.
Wikipedia tells us that ain't such a nice tree.
"It is native to eastern Asia: northern China, northeast China, Korea, Ussuri, Amur, and Japan, the Amur cork tree is considered invasive in many parts of North America. The State of Massachusetts lists it as a noxious weed."