Oaks of the World

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 Quercus resinosa
AuthorLiebm. 1854
Synonyms macrophylla sensu Trel.1924, not Née
Local names 
Range Mexico (Aguascalientes, Durango, Guanajuato, Jalisco, Michoacan, Nayarit, San Luis Potosi, Zacatecas); 1300-2600 m;
Growth habit 6-12 m tall; trunk to 0.4 m in diameter;
Leaves 10-30 cm x 8-18, sometimes more; deciduous or semi-evergreen; thick, stiff; broadly oboval; apex rounded, broad, mucronate; base narrowly rounded or cordate; margin thickened, flat or slightly revolute, wavy, crenate or with 6-12 pairs of short, mucronate, blunt teeth; lustrous green above with scattered pubescence made of sessile, stellate, 4-8 rayed-trichomes and golden glandular ones; dense tomentum whitish yellow beneath made or short, stalkless, stellate 5-12-rayed-trichomes, and rusty glandular ones; 12-20 vein pairs, straight and parallel, flat above, raised under; epidermis smooth, or slightly bullate and papillose; petiole tomentose, short 0.2-0.6 cm); young leaves are sticky, hence the species name;
Flowers March to May; staminate catkins 7-15(-20) cm long, with more than 30 flowers; pistillate flowers 1 to 10 along tomentose catkin 2-5 cm long;
Fruits acorn ovoid 1.5-3 cm long; singly or to 5 together or more, on a tomentose peduncle 1.5-6 cm long; cup halfround 18-23 mm in diameter, with greyish tomentose scales, enclosing 1/3 to 1/2 of nut; maturing first year from October to November;

Bark, twigs and
buds

bark thick, scaly, dark; twig thick (0.4-1 cm in diameter), angled, with tawny tomentum and yellowish lenticels; bud 3-6 mm long, ovoid, pointed, with ciliate scales; stipules reaching 1.5 cm long, linear, hairy, often persistent;
Hardiness zone, habitatnot hardy;
Miscellaneous-- A. Camus = n° 214;
-- Section Quercus;
-- Closely related to Q.magnoliifolia, which differs mainly in having thinner twigs, longer petioles and a bullate epidermis;
Subspecies and
varieties
 
Pictures