Oaks of the World

General dataClassificationsList of speciesLocal namesBack to
home page

 Quercus affinis
AuthorScheidw. 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, Puebla, Queretaro, San Luis Potosi, Tamaulipas and Veracruz); 1200-2800 m;
Growth habittree to 25 m high, often smaller;
Leaves 2-12 cm long, 1-3 cm wide; evergreen; oblong to lanceolate; apex attenuate almost acuminate, bristle-tipped; base cuneate, seldom rounded; margin not revolute, entire or with some (less than 6 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 without glandular trichomes; 5-9 vein pairs, flat above, sometimes inconspicuous; hairless petiole 0.5-2 cm long;
Flowers in March : 7 male flowers on 13-19 cm long catkins, with 4 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, enclosing1/3 of nut, with brown, triangular scales ciliate at margin; maturing in 1 or 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;
-- 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 prominent veins and upper face different from lower one;
Subspecies and
varieties
For Trelease = f. commutata (Liebm.) Trel. 1924 and f. subintegra (A.DC) Trel. 1924
Pictures