Cyclobalanopsis is a genus of about 150 species of flowering plants in the family Fagaceae, native to eastern and southeastern Asia. The genus is closely related to Quercus and included in it as a subgenus by many botanists; however, the Flora of China treats it as a distinct genus. The species share the same common name oak with Quercus. They are evergreen trees growing 10-30 m tall. They are distinct from Quercus oaks in that they've acorns with distinctive cups bearing concrescent rings of s… (More on Cyclobalanopsis)