Oaks of the World

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 Quercus durifolia
AuthorSeemen ex Loes. 1900
Synonyms 
Local namessipuri; Durango Emory Oak;
Range Mexico (Chihuahua, Durango, Sinaloa, Sonora); 1700-2350 m;
Growth habit2-9 m tall;
Leaves 3-6 cm long, 1-2 wide; evergreen or lately deciduous ; subcoriaceous; elliptic-lanceolate or oblong-lanceolate; apex rounded or acute, bristle-tipped; base obtuse or slightly cordate ; margin thick, not revolute, often undulate, mostly entire; dark grey-green above, hairless except some multiradiate hairs scattered along midrib; greyish green beneath, with an even, dense, more or less persistent tomentum, made of stellate, stalkless, long trichomes, without glandular hairs; midrib yellow, almost glabrous; 7-10 vein pairs, sometimes slightly impressed; epidermis bullate, papillose; petiole 0.5-1 cm long, glabrescent;
Flowers 
Fruits acorn halfround 1 cm long, singly or paired, subsessile or on a very short stalk; cup with light grey hairs, enclosing 1/2 of nut; maturing in 1 year from August to October;

Bark, twigs and
buds

bark blackish, rough, fissured; twig slender, glabrescent; bud ovate, light brown, 2 mm long; 
Hardiness zone, habitathardiness zone : 7;
Miscellaneous -- A. Camus : n° 296;
-- Section Lobatae;
--
Differs from Q. eduardii in the bullate epidermis (smooth for eduardii), the entire margin (dentate for eduardii), the presence of multiradiate hairs only (eduardii has also fascicled ones), and in the undulate rays of the multiradiate hairs (spiraly twirled for eduardii).
Subspecies and
varieties
 
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