Quercus cualensisQuercus cualensis is a rare species of oak. It has been found only in a small region in the State of Jalisco in western Mexico, in the Sierra [el Cuale] mountains south of Puerto Vallarta.DescriptionQuercus cualensis is an evergreen tree up to tall, with a trunk as much as in diameter. The leaves are thin, flat, and hairless, narrowly lance-shaped, up to 15 cm long.