Oaks of the World

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  Quercus cordifolia
Author Trel. 1924 Mem. Natl. Acad. Sci. 20: 84
Diagnosis here
Local names
Range Mexico ( Coahuila, Nuevo León, San Luís Potosí, NE Zacatecas); ca 1700-3200 m;
Growth habit less than 1.5 m; bushy; rhizomatous;
Leaves 1-4 x 0.7-1.5 cm; deciduous or semi-evergreen; thin but subcoriaceous; oval, oval-elliptical, or oval-lanceolate; apex obtuse or remotely acute, mucronate; base variably cordate, sometimes obtuse; margin flat, not revolute, sometimes slightly undulate, entire or seldom with 1-2 pairs of mucronate teeth asymmetrically arranged, and in different numbers on each side; olive green above, with thin gray pubescence made of stellate and simple not glandular trichomes; whitish and densely tomentose beneath, with stellate 7-12 straight rayed, 0.5-0.6 mm long trichomes, and sometimes some glandular ones; 6-10 vein pairs, not or selfom impressed, slightly curved; epidermis slightly papillose; petiole slender (1 mm thick), pubescent, 2-5 mm long;
Flowers male catkins 0.5-2 cm long, few flowered; April-May;
Fruits acorn 1-1.4 cm long, ovoid or subglobose, mucronate, dark brown to blackish, hairless; solitary to 4 together; subsessile or on short peduncle 1-2 cm long; cup halfround, straight at the rim, with thick proximal tomentose scales; 1/3 or 1/2 enclosed by cup; ripen first year in July-September;

Bark, twigs and

bark rough, grey, fissured into thin irregular plates; twig slender, tomentose during 1 or 2 years, becoming glabrescent and reddish, with minute lenticels; bud globose, very small (1-1.5 mm), dark red; stipules 1-5 mm long, deciduous, subulate, pubescent at base;
Hardiness zone, habitat not quite hardy;
Miscellaneous -- A. Camus : n° 253 ;
-- Sub-genus Quercus, Section Quercus, Subsection Leucomexicanae;
-- Possible confusion with Q. striatula (often considered as a synonym), but the latter has a basally rounded leaf, with a margin flat or slightly revolute bearing 3-7 veins pairs of asymmetrically arranged teeth, longer glandular uniseriate trichomes, longer rays on the stellate trichomes, some capitate (bullate) glandular trichomes, and acorns inclosed 1/4 to 1/3 by cup.
Subspecies and