Oaks of the World

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  Quercus x dysophylla
Author Benth. 1840 Pl. Hartw. 55
Synonyms crassifolia x crassipes
hahnii Trel. 1924  Diagnosis here
dysophylla Née
esperanzae Trel. 1924 Diagnosis here
fournieri Trel. 1924 Diagnosis here
Local names laurelillo
Range Mexico (Guanajuato, Michoacan, Hidalgo, Mexico, Veracruz, San Luis Potosi, Tlaxcala); 2000 to 2800 m;
Growth habit 5-20 m
Leaves 4-14 cm long, 2-5 cm wide; deciduous; thick, leathery; ovate, lanceolate, or elliptic; base rounded to cordate, sometimes asymmetric; apex obtuse or pointed, aristate; margin thick, sometimes undulate, revolute, entire or slightly crenate, with sometimes an aristate tooth each side, and simple aristae (0 to 12) scattered along the margin; smooth, bright, dark green above with some fasciculate sessile hairs scattered on the limb and along midrib; densely yellowish tomentose to lanuginous beneath (stalked, fasciculate hairs 0.5 mm long, and some glandular hairs); 9-14 pairs of lateral veins, straight or slightly curved, prominent beneath; epidermis bullate; petiole hairy, coffee-coloured aging darker, 3-8 mm long;
Flowers March-April; male catkins 5-10 cm long, bearing numerous pubescent flowers; 1 or 2 pubescent female flowers on a 0.4-1 cm long axis;
Fruits acorn ovoid 1.5 cm, grey brown, solitary or paired; sessile or on a very short peduncle (1-2 mm); cupule shallow, turbinate or sometimes half-round, with thin and rounded scales, sometimes rim rolled under, enclosing half of the nut; maturing in 2 years in September-October;

Bark, twigs and

bark grey, scaly; twigs 1-3 mm long, grooved, tomentose first year, becoming smooth, with lenticels; buds ovoid, with rounded apex, pale brown, 2-5 mm long, with margin scales pilose; deciduous, pubescent, 4-9 mm long stipules;
Hardiness zone, habitat hardy zone 7;

-- Sub-genus Quercus, section Lobatae;
-- Closely related to Q. crassifolia, but this one has wider, obovate, dentate leaves, abaxially yellow or orange or light brown, with an epidermis bullate and papillose;
-- For Govaerts & Frodin, Q.hahnii (A. Camus : n° 308) is a separate species. For Zavala-Chavez, 2003, it is a variety of Q.hintonii.

Subspecies and