Quercus mongolica (Mongolian oak or the Shandong silk oak)! Did you know that the Chinese not only produce silk from mulberry trees, but also from Mongolian oak trees? The Chinese oak silkworm, Antheraea pernyi, is the worker employed according to Food Plants of China! See https://academic.oup.com/
The Mongolian oak nuts were also sometimes eaten and the leaves were used for tea, boiled with the fruits of Siberian crabapple, Malus baccata!