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Davis Mountain Oak

Texas Natives

Quercus Depressipes

Quercus Depressipes, commonly known as the Davis Mountain oak, Mexican dwarf oak, or creeping oak, is a diminutive, low-growing deciduous or semi-evergreen shrub native to the high-elevation montane habitats of West Texas and northern to central Mexico. Characterized by its unique rhizomatous and colonial growth habit, this hardy oak typically stands only 1 to 2 meters (3 to 6 feet) tall, frequently forming dense, low-growing thickets or ground-hugging mats that spread outward up to 3 meters across. The older bark is light gray, thin, and papery, flaking off in thin scales, while its young twigs are slender, yellowish-brown, and covered in fine, velvety hairs. Its small, leathery (coriaceous) leaves are oblong, elliptic, or obovate, measuring 1 to 3.5 cm long and 0.5 to 2.5 cm wide, and feature a striking blue-green or glaucous appearance on both surfaces. The leaves are generally smooth-margined (entire) or bear 1 to 4 small, mucronate teeth near the rounded apex, with a shallowly cordate or rounded base.

The species flowers concurrently with spring leaf emergence, producing separate male catkins and inconspicuous female flowers on the same plant. By late summer and fall, it yields small, solitary or paired acorns that are either sessile or borne on short peduncles up to 10 mm long. The individual acorns feature a hemispheric to deeply cup-shaped cupule that covers one-third to one-half of the nut; the cup scales are thin, appressed, and finely pubescent. The light brown, oval to oblong nut measures 10 to 15 mm in length and 8 to 12 mm in width. Strongly adapted to harsh, arid climates, Quercus depressipes is restricted to rocky igneous slopes, canyons, and high-altitude pine-oak woodlands between 2,000 and 2,600 meters elevation. In the United States, its distribution is famously confined to a few isolated peaks within the Davis Mountains of Jeff Davis County, Texas, making these high-desert colonies a critical focus for regional conservation efforts.

Global Rank: G3