Quercus rupestris
Quercus rupestris is a small tree species in the beech family Fagaceae. It is placed in subgenus Cerris, Quercus [sect. Cyclobalanopsis|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 đá. There are no known sub-species.