Pungent Oak - Quercus pungens
Most common in southwestern Texas, and also local to southeastern Arizona and southwestern New Mexico, this is a small oak (to 25 feet) that is sometimes a thicket-forming shrub. It grows on limestone soils in canyons and on hillsides. Similar to Mohr Oak, it has leathery, sharply toothed leaves that are roughened, gray-hairy beneath, and only about two inches in length. The leaves are evergreen or semi-evergreen and glossy green when new. The acorns are broad- to cylinder-shaped, light brown, and covered with a cup that can be very shallow to deep.