Oaks of the World

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  Quercus pachucana
Author F.Zavala-Chavez 1990
Synonyms  
Local names  
Range Mexico (Hidalgo, Sierra de Pachuca); near 2800 m;
Growth habit 4-6 meters tall, sometimes shrubby, with branches from low on the trunk;
Leaves 3.5-8 cm x 1.5-3, leathery, elliptic-lanceolate or oblanceolate; apex obtuse or acute, usually shortly aristate; base narrower, rounded or subcordate, often asymmetrical; margin flat or weakly wavy, revolute, with 1-2 aristate teeth each side in the distal 1/3; 6-9 vein pairs; hairless, green above, except stellate pubescence at base and along midrib; beneath often bullate, yellowish hairy, with slightly prominent veins; young leaves with short, dense pubescence; petiole reddish brown, 2.5-8 mm long, with persistent stellate tomentum;
Flowers from January to March;
Fruits acorn 1-1.3 cm long, single or paired, stalkless or on a very short peduncle; cup halfround, straight at margin, with flat scales ciliate at margin; maturing in 2 years, from August to November;

Bark, twigs and
buds

bark grey, fissured into irregular, small, thick, more or less concave plates; twig brown, 1-1.5 mm thick, with minute, dense stellate tomentum and some simple hairs; some lenticels; bud 2-3 mm with more or less pointed apex; stipules 4-5 mm, deciduous when leaves become adult.
Hardiness zone, habitat  
Miscellaneous -- Section Lobatae, series Mexicanae;
-- Related to Q.crassipes and Q.mexicana;
-- Often confused with mexicana (but leaves are toothed) and with crassipes (but the cup's margin is straight).
Subspecies and
varieties
 
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