Oaks of the World

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 Quercus x dysophylla
AuthorBenth. 1840
Synonyms crassifolia x crassipes
hahnii Trel. 1924  
dysophylla Née
esperanzae Trel. 1924
fournieri Trel. 1924
Local names laurelillo
Range Mexico (Guanajuato, Michoacan, Hidalgo, Mexico, Veracruz, San Luis Potosi, Tlaxcala); 2000 to 2800 m;
Growth habit 5-12 m
Leaves 4-14 cm long, 2-5 cm wide; deciduous; thick, leathery; ovate, lanceolate or elliptic; base rounded to cordate; apex pointed, aristate; margin thick, sometimes undulate, revolute, entire or slightly crenate, with sometimes an aristate tooth each side; smooth, bright, dark green above with some stellate hairs scattered on the limb and along midrib; densely yellowish tomentose beneath (stalked, stellate 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; cupule shallow, turbinate or sometimes half-round, with thin and rounded scales, sometimes rim rolled under, enclosing half of the nut; maturing in 1 year 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, habitathardy zone 7;

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

Subspecies and