Oaks of the World

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  Quercus praeco

Trel. 1924 Mem. Natl. Acad. Sci. 20: 88

Diagnosis here

Local names encino de asta ;
Range Mexico (Jalisco, Nayarit, Zacatecas) ; 1700-2600 m ;
Growth habit 3-9 m tall, trunk to 40 cm in diameter; spreading crown;
Leaves 4-10 x 2-6 cm; deciduous; subcoriaceous; oblong-oboval, oblong-elliptic to oboval; apex rounded or sometimes subacute; base rounded or subcordate; margin flat or revolute, lobed with short mucros, or sinuate-dentate with 4-7 pairs of short, blunt teeth; lustrous green above, often covered with stellate and fascicled hairs; dense whitish-grey tomentum beneath, made of the same types of trichomes as adaxially, hiding totally the epidermis; secondary veins 7-12 pairs, flat or remotely impressed adaxially, prominent beneath; epidermis pale green, papillose, seldom bullate ; petiole tomentose 0.3-1 cm long;
Flowers male catkins 6 cm long, with hairy axis; pistillate flowers 1-5 on a 3-7 cm long stalk;
Fruits acorn 1.7-2 cm; ovoid; in clusters on a strong peduncle to 8 cm long; enclosed 1/2 by cup; cup campanulate, 1.5-2.5 cm in diameter, margin strongly rolled inside; maturing in 1 year;

Bark, twigs and

bark fissured; twig 2-4 mm thick, yellowish white tomentose; buds 2-4 mm long, ovoid, obtuse, tomentose; persistent stipules;
Hardiness zone, habitat not hardy in zone 7; prefers dry, rocky soils;
Miscellaneous -- A. Camus : n° 186;
-- Sub-genus Quercus, Section Quercus, Series Leucomexicanae;

Subspecies and