Quercus rupestris is a small tree species in the beech family Fagaceae. It is placed in subgenus Cerris, section Cyclobalanopsis.
This is a small tree species, growing to 5–6 m, which appears to be endemic to Vietnam, where it may be called sồi vùng đáPhạm Hoàng Hộ (2003) Cây Cỏ Việt Nam: an Illustrated Flora of Vietnam vol. II publ. Nhà Xuẩt Bản Trẻ, HCMC, VN. There are no known sub-species.
References Hickel & A.Camus, 1923 In: Bull. Mus. Natl. Hist. Nat. 29: 599 WCSP: World Checklist of Selected Plant Families
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