acer grisum Acer griseum  ( Paperbark Maple ;  simplified Chinese : 血皮枫;  traditional Chinese : 血皮楓; pinyin :  xuè pí fēng ) is a species of  maple  native to central  China , in the provinces of  Gansu , Henan ,  Hubei ,  Hunan ,  Shaanxi ,  Shanxi , and  Sichuan , at