Oaks of the World

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 Quercus durifolia
Author Seemen ex Loes. 1900 Bot. Jahrb. Syst. 29: 95
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; lanceolate or oblong-lanceolate; apex rounded or acute, bristle-tipped; base obtuse or slightly cordate ; margin thick, not revolute, often undulate, mostly entire but with sometimes 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, more or less persistent tomentum, made of fasciculate, 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 male catkins 3 cm long, with pubescent rachis; male flowers with 6 stamens, and glabrous anthers; female flowers stalkless or nearly so;
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

bark blackish, rough, fissured; twig slender, 2-4 mm thick, glabrescent; bud ovate or globose, light brown, 2 mm long; inconspicuous lenticels;
Hardiness zone, habitathardiness zone : 7;
Miscellaneous -- A. Camus : n° 296;
-- Sub-genus Quercus, 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).
-- Possible confusion with Q. saltillensis, but this one is glabrescent abaxially, with stellate trichomes only along veins.
Subspecies and