Oaks of the World

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 Quercus affinis
Author Scheidw. 1837 Belg. Tuinb., Int. Ed. 4: 321 1837.
Synonyms commutata Liebm. 1854
affinis f. commutata Trel. 1924
affinis f. subintegra Trel. 1924
lancifolia Benth. 1840, nom. illeg, not Schltdl. & Cham. 1830, nec Liebm. 1864
nitens Mart. & Gal. 1842
nitens var. subintegra A.DC 1864
Local names 
Range NE, C, S and SE Mexico : Sierra Madre Oriental and East of the Volcanic Trans-Mexican Belt (Guanajuato, Hidalgo, Nuevo Leon, Oaxaca, Puebla, Queretaro, San Luis Potosi, Tamaulipas and Veracruz); 1200-2600 m;
Growth habittree to 25 m high, often smaller;
Leaves 2-9 cm long, 1-3 cm wide; evergreen; coriaceous ; elliptic to lanceolate; apex attenuate almost acuminate, bristle-tipped; base cuneate, seldom rounded; margin not revolute, entire or with some (less than 5 pairs) short, bristle-tipped teeth on apical half; at first rusty-colored both sides; mature leaves dark green, shiny, glabrous above or with some stellate trichomes near base; almost concolor beneath with some axil tufts; 5-9 vein pairs, flat above, sometimes inconspicuous; epidermis smooth ; hairless petiole 0.5-1,6 cm long;
Flowers in March : 7 male flowers on 3-6 cm long catkins, with 4-5 stamens. Female inflorescences 2-8 mm long, bearing 1 or 2 flowers;
Fruits acorn 1-1.5 cm long; ovoid to subglobose; 1 to 2 together on a short peduncle; cup halfround or bowl-shaped, enclosing 1/2 or 1/3 of nut, with brown, triangular scales ciliate at margin; maturing in 2 years, from July to September;

Bark, twigs and
buds

young bark smooth, mature one dark grey, scaly; thin (1-2.5 mm), glabrescent twig, becoming grey brown when mature, longitudinaly sulcate, with pale lenticels; small conical, brown buds, 2-4 mm long, with hairy-margin scales;

Hardiness zone, habitat hardiness zone 7-8;  rather fast-growing;
Miscellaneous-- A. Camus : n° 229;
-- Sub-genus Quercus, section Lobatae; sub-section Lanceolatae;
-- Very closely related to Q.laurina (which it may hybridize with); Q. laurina is different in having thicker twigs, ovate buds, bigger leaves with abaxially prominent veins, and upper face different from lower one;
-- Resembles Q. eduardii but this taxon has fasciate trichomes on the whole lower side ; resembles as well Q. galeanensis which is much more low a shrub and has oblong to oblanceolate leaves.
Subspecies and
varieties
For Trelease = f. commutata (Liebm.) Trel. 1924 and f. subintegra (A.DC) Trel. 1924
Pictures