Quercus mongolica, commonly known as Mongolian oak, is a species of oak native to Japan, northern China, Korea, Mongolia, and southeastern Siberia. The species can grow to be tall.Ohwi, J. Flora of Japan, 1984. Woody Plants of Japan, Vol. 1, 2000.
The flavono-ellagitannins mongolicin A and B can be found in Quercus mongolica var. grosseserrata.Tannins and related compounds. LXXI. Isolation and characterization of mongolicins A and B, novel flavono-ellagitannins from Quercus mongolica var. grosseserrata. Ishimaru K, Ishimatsu M, Nonaka G, Mihashi K, Iwase Y and Nishioka I, Chemical and Pharmaceutical Bulletin, 1988, volume 36, number 9, pages 3312–3318
Extrafloral nectaries have been reported on the leaf buds of this species.
Three varieties are accepted: Quercus mongolica var. crispula – Japan, Korea, Manchuria, southern Russian Far East, and Sakhalin Quercus mongolica var. mongolica – Mongolia, northern China, Korea, and southern Russian Far East Quercus mongolica var. mongolicoides – Kantō region of Honshu, Japan
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line drawing, Flora of China Illustrations vol. 4, fig. 365, 1-3