Quercus macrocalyx is a tree species in the beech family Fagaceae There are no known subspecies. It is placed in subgenus Cerris, section Cyclobalanopsis.
This oak tree grows up to 20 m tall. It is native to northern Indochina (Myanmar, Laos, and Vietnam), Tibet, and southern China including Hainan. In Vietnam it may be called sồi đấu to.Phạm Hoàng Hộ (2003) Cây Cỏ Việt Nam: an Illustrated Flora of Vietnam vol. II publ. Nhà Xuẩt Bản Trẻ, HCMC, VN
References Hickel & A.Camus, 1921 In: Ann. Sci. Nat., Bot., X, 3: 383 WCSP: World Checklist of Selected Plant Families
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