Oaks of the World

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  Quercus durifolia
Author Seemen ex Loes. 1900 Bot. Jahrb. Syst. 29: 95
Local names sipuri; Durango Emory Oak;
Range Mexico (Chihuahua, Durango, Nuevo Leon, Sinaloa, Sonora, Tamaulipas); 1700-2350 m;
Growth habit 2-9 m tall; often taller in cultivation;
Leaves 3-6 cm long, 1-1.5 wide; evergreen or lately deciduous ; subcoriaceous; lanceolate or oblong-lanceolate; apex obtuse or acute, bristle-tipped; base obtuse or slightly cordate ; margin flat, not revolute, often undulate, mostly entire but with seldom 1-2 aristed teeth near apex; dark grey-green above, hairless except some multiradiate hairs scattered along midrib; greyish green beneath, with an even, dense, short, more or less persistent tomentum, made of fasciculate, undulate, stalkless or shortly stipitate, long trichomes, without glandular hairs; midrib yellow, almost glabrous; 7-11 vein pairs, sometimes slightly impressed; epidermis papillose; petiole 0.5-1 cm long, glabrescent;
Flowers in May ; male catkins 3 cm long, with pubescent rachis; male flowers with 6 stamens, and glabrous anthers; female flowers stalkless or nearly so;
Fruits acorn ovoid or ellipsoid, 1-1.3 cm long, singly or paired, sessile or on a very short stalk; cup conical to halfround, with light grey hairs, enclosing 1/2 of nut; maturing in 1 year from August to October;

Bark, twigs and

bark blackish, smooth at first, then rough, fissured; twig slender, 2-4 mm thick, glabrescent (young twigs tomentose); bud ovate or globose, light brown, 2 mm long; unconspicuous lenticels;
Hardiness zone, habitat hardiness zone : 7;
Miscellaneous -- A. Camus : n° 296;
-- Sub-genus Quercus, section Lobatae, Series Erythromexicanae;
-- Differs from Q. eduardii in the entire margin (dentate for eduardii), and in the undulate rays of the fasciculate hairs (spiraly twirled for eduardii).
-- Possible confusion with Q. saltillensis, but this one is glabrescent abaxially, with stellate trichomes only along veins.

Subspecies and