Oaks of the World

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  Quercus x robusta
Author C.H.Muller 1934 Torreya 34: 119
Synonyms emoryi x gravesii
Local names Chisos mountains oak
Range Texas (Chisos Mountains, in wet canyons), to 1500 m;
Growth habit reaches 13 m;
Leaves oval, 6-12 cm long, 2-5cm wide, apex pointed, base subcordate, toothed or rarely entire, glabrous on both sides; 8 vein pairs; petiole 1-2cm long, pubescent;
Fruits acorn maturing in 2 years, 1-2cm long, enclosed for 1/4 or 1/3 of length in cup with pointed, appressed scales;

Bark, twigs and

bark dark and furrowed; twigs dark brown, slender;
Hardiness zone, habitat
Miscellaneous -- A. Camus : n° 428;
-- For C.H. Muller, and for Govaerts & Frodin (1998), it's a true species (fixed hybrid);

Subspecies and