Quercus mongolica, commonly known as Mongolian oak, is a species of oak native to Japan, China, Korea, Mongolia, and Siberia. The species can grow to be 30 m tall.
The flavono-ellagitannins mongolicin A and B can be found in Quercus mongolica var. grosseserrata.
line drawing, Flora of China Illustrations vol. 4, fig. 365, 1-3
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*All information is based on published scientific research