I may not have enough images handy to ID this one, but I'd still like to try.
Has been growing happily in slow-draining soil for two years.
Zone 5b, northeastern Indiana.
Leaves are very large in relation to the rest of the plant and hold well into winter. Leaves do not appear to show any appreciable autumn color change.
The plant was sent to me as a flowering tree, but I can't find a match for it...