Quercus stenophylloides, also called Arisan oak, is a species of evergreen, broad-leaf tree endemic to Taiwan.

[3] Quercus stenophylloides can grow up to 15 m (49 ft) tall, with trunks up to 40 cm (16 in) wide.

[4] Blooming from May to June, the flowers are unisexual and are both small, hairy, growing on the same individual tree.

Both are arranged on a stem, only staminate flowers' are a lot longer.

Also, staminate flowers are arranged spirally on a slim drooping stem — this is called catkins.