Oaks of the World

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 Quercus pinnativenulosa
AuthorC.H.Muller 1936
Synonyms 
Local names 
Range Mexico (Hidalgo, Nuevo Leon, Oaxaca, San Luis Potosi, Tamaulipas, Querétaro and Veracruz); 800-2000 m;
Growth habit 7-30 m tall, trunk to 0.9 m in diameter;
Leaves 7-13 x 1.8-3.5 cm; leathery; elliptic to oblanceolate; apex acuminate with long bristle-tip, often in a spiral; base acute, seldom rounded; margin entire or sometimes slightly undulate, sometimes remotely rolled under; yellowish green, lustrous, hairless above; hairless beneath; somewhat concolor; 8-16vein pairs, angled more than 45° with the midvein , impressed above but not conspicuous, prominent below; epidermis smooth, slightly papillose ; petiole 3-8 mm long, glabrous;
Flowers in March-April; male catkins 6-9 cm long, with some unicellular hairs, lax; female inflorescence 5 mm long, most often 2-3 flowered;
Fruits acorn 1-1.3 cm long, 0.8-1 cm wide; solitary or paired on a 5-8 mm long stalk; nut enclosed 1/3 by cup; cup half-round slightly rolled inside, 0,7-0,9 cm wide, with triangular, pubescent scales; maturing in 2 years from June to October;

Bark, twigs and
buds

twig 1.4-2(-3) mm in diameter, hairless, greyish, silky, slightly sulcate, with inconspicuous, yellowish lenticels; buds conical or ovoid, 3-4.5 mm long, with greyish, glabrous scales and apex pointed; stipules linear 1-1,3 cm long, hairy at margin, deciduous;

Hardiness zone, habitat mixed mountain forests (with Q.affinis, Q.polymorpha) ; withstands -16°C;
Miscellaneous
-- A. Camus : n° 353;
-- Section Lobatae; sub-section Eugeniaefoliae;
-- not well known; area restricted;
-- closely related to
Q.salicifolia Liebm., from which it differs in having narrower leaves (2-4 mm for salicifolia), margin not always revolute, base acute (round for salicifolia), veins less prominent beneath, petiole longer (1-6 mm for salicifolia), stipules longer (5 mm for salicifolia);
Subspecies and
varieties
 
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