The US National Arboretum's Asian Collection. Photographed late May of 2006. Leaves resemble "Sweetgum".
It used to be Acer campbellii ssp. sinense but is now considered a full species according to : Accepted Names for the Genus Acer | The Maple Society I have a few, from seeds gathered in Britain, from the Maple Society seed exchange. Here are two that look a bit different (colours), it must be the conditions they were raised (age, soil mix, exposure, etc.) :