Oaks of the World

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 Quercus pinnativenulosa
AuthorC.H.Muller 1936
Synonyms 
Local names 
Range Mexico (Nuevo Leon, San Luis Potosi, Tamaulipas, Querétaro and Veracruz); 800-1600 m;
Growth habit 7-20 m tall, trunk to 0.5 m in diameter;
Leaves 6-13 x 1.8-3.5 cm; 3.2 to 4.4 times longer than wide ; leathery; elliptic to oblong or oblanceolate; apex acuminate with long bristle-tip, often in a spiral; base acute, seldom rounded; margin entire or seldom with 1-2 short bristle-tipped teeth near apex, sometimes slightly undulate and even remotely rolled under (old trees); yellowish green, lustrous, hairless above; hairless beneath; somewhat concolor; 8-16 vein pairs, angled more than 45° with the midvein , flat or impressed above but not conspicuous, weakly raised below; epidermis smooth, slightly papillose ; petiole 5-17 mm long, glabrous;
Flowers in March-April; male catkins 6-9 cm long, with some unicellular hairs, lax; female inflorescence 5-8 mm long, most often 2 flowered;
Fruits acorn 1.4-1.9 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 with straith margin, 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 narrowly conical or ovoid, 3-4.5 mm long x 1-2.3 mm wide, 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 cuneate (round for salicifolia), veins less prominent beneath, petiole longer (1-6 mm for salicifolia), stipules longer (5 mm for salicifolia), and acorns maturing in 2 years (annual for salicifolia);
Subspecies and
varieties
 
Pictures