Oaks of the World

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  Quercus opaca

Trel. 1924 Mem. Natl. Acad. Sci. 20: 92

Diagnosis here

Local names  
Range Mexico (Hidalgo, Oaxaca, Tamaulipas); 1200-2000 m;
Growth habit not exceeding 3 m tall, usually 0.6 m;
Leaves 3.5-5.5 cm long, 1.5-3 cm wide; evergreen; subleathery; ovate to elliptic; apex acute, mucronate; base obtuse to cordate; margin thickened, flat or remotely revolute, entire or with 1-3 pairs of sharp mucronate teeth; yellowish green adaxially, slightly lustrate, glabrescent (sessile, multiradiate trichomes at base of the midvein); beneath not lustrous, almost glabrous except some sessile trichomes and white glandular hairs mainly on midvein; epidermis markedly whitish papillose; 6-10 vein pairs; petiole 3-5 mm long, pubescent, reddish brown;
Flowers male catkins 3-4 cm long, with many flowers;

Bark, twigs and

bark grey, scaly; twigs 1.5-2 mm in diametre, sulcate, waxy, at first with short pubescence made of sessile multiradiate trichomes and glandular hairs, glabrescent; bud subglobose, 1-3 mm wide, brown, with scales pubescent on margins; stipules pubescent, deciduous;
Hardiness zone, habitat  
Miscellaneous -- A.Camus : 177;
-- Sub-genus Quercus, Section Quercus;
-- Closely related to Q.pringlei.
Subspecies and