Mt. Lemmon White Oak | Arizona
Moving another 500 miles to the west, we find this oak near the top of the Mount Lemmon on the outskirts of Tucson, Arizona. Clearly, this tree resembles Gambel Oak. It also rather resembles Oregon White Oak. But the acorn cup and shape differ from both, and the acorns are attached to the twigs on short peduncles, a characteristic not shared with any of the related western White Oaks. But it is shared with the typically-shrubby Netleaf Oak, Quercus rugosa, which grows in the same habitat. Thus, identifying this tree proves enigmatic.