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Field

Oaks of the World

The Sibley Guide to Trees

Common Names

Chisos mountains oak

Robust Oak

Geographic Range

Texas (Chisos Mountains, in wet canyons), to 1500 m;

Found only in a few moist wooded canyons in the Chisos Mountains of W TX.

Growth Habit

reaches 13 m; spreading branches;

Deciduous

Leaves

6-12 cm long, 2-5 cm wide; deciduous; coriaceous, stiff; broadly lanceolate or oval; apex pointed, often long acuminate; base slightly cuneate or truncate, or subcordate; margin unevenly lobed, with 3-5 pairs of aristate teeth, rounded and deep sinuses; both sides glabrous, with persistent hairs above along midrib; beneath frequent axil tufts; 8 vein pairs remotely raised above, prominent beneath; petiole 1-2cm long, pubescent;

4”
usually with several large teeth
widest at the base

Fruits (Acorns)

acorn 1.5-2 cm long, oblong, subcylindrical, sometimes elongated, puberulent, with longitudinal stripes; enclosed for 1/4 or 1/3 of length in cup with pointed, tomentose, appressed scales; maturing in 2 years;

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Flowers

female carkin 5-6 mm or even shorter, bearing1-2 fruits;

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Hardiness & Habitat

prefers wet places, in mountains;

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Additional Information

– A. Camus : tome 3, p. 424, n° 428; – For C.H. Muller, and for Govaerts & Frodin (1998), it’s a true species (fixed hybrid);

Thought to be a hybrid of emoryi x gravesii