Quercus longinux
Quercus longinux is an uncommon Asian species of trees in the beech family Fagaceae. It has only been found in Taiwan. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus longinux is a tree. Leaves can be as much as 8 cm long. Acorn is up to 12 mm long, narrower than those of most other species in the subgenus.