Quercus × pachucana Zavala-Chavez

Mexico (Hidalgo, Sierra de Pachuca); near 2800 m;

4-6 meters tall, sometimes shrubby, with branches from low on the trunk;

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;

from January to March;

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;

– Sub-genus Quercus, section Lobatae, series Erythromexicanae, group 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).