Oaks of the World

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 Quercus deserticola

Trel. 1914 Mem. Natl. Acad. Sci. 20: 79
Diagnosis here

Synonyms alveolata Trel. 1924 Diagnosis here
bipedalis Trel. 1924 Diagnosis here
tamiapensis C.H.Mull. 1942
texcocana Trel. 1924   (A. Camus : 247) Diagnosis here
vallicola Trel. 1924 Mem. Natl. Acad. Sci. 20: 81 (A. Camus : 246) Diagnosis here
Local namesencino tecux; encino chico;
Range Mexico (D.F., Guanajuato, Hidalgo, Jalisco, Mexico, Michoacan, Puebla, Queretaro); 1100 - 2800 m ;
Growth habitrarely exceeding 3 m (may sometimes reach 10 m); crown spreading, wider than high;
Leaves 5-8 x 2-4 cm; deciduous; leathery, rough; oblong, oboval or more or less broadly elliptic; apex blunt or rounded, mucronate; base rounded sometimes cordate; margin revolute, entire or undulate or crenate-dentate, with 4-6 (10) pairs of teeth with straight mucro 0.3-0.5 mm long; dark green above with some scattered stellate 7-11 rays hairs, especially along midvein; paler below, glaucous, with dense, pediculate, stellate pubescence and some glandular hairs; épidermis papillose, slightly bullate; 6-11 vein pairs, slightly curved, impressed above, prominent beneath; petiole tomentose, 2-6 mm long, thickened at base;

in May; 18-20 male flowers on a 2-3 cm long rachis; pistilate flowers 3-10 together on a 3 cm long peduncle, densely pubescent;

Fruits acorn 1.5 cm, ovoid; 1 to 3 on a stout, tomentose, 2-9 mm long stalk; enclosed 1/3 in the cup; cup half-round, 1.4-2 cm wide, with convex basal scales; maturing in 1 year, from July to December;

Bark, twigs and

bark sulcate, grey or dark coffee, with conspicuous lenticels on old twigs; twigs 1-2 mm thick, with dense, yellow, persistent tomentum; bud subglobose, pale coffee, hairy, 2-4 mm; stipules 3-7 mm long, reddish, persistent;
Hardiness zone, habitatnot hardy (?); dry, rocky soils ;
Miscellaneous-- A. Camus : n 251;
-- Sub-genus Quercus, Section Quercus;
-- Resembles Q. grisea, but this one is much taller, has ovoid buds, 2-4 cm long leaves with stalkless stellate trichomes abaxially; resembles also Q. laxa which differs by the lack of stellate trichomes abaxially, and also Q. praeco which has stellate trichomes abaxially, raised veins above, the rim of the cup invaginate.
Subspecies and

Q.vallicola is considered by some Authors (Govaerts & Frodin), as true species, but not by today's Mexican Authors (Susana Valencia-A., 2006); in 2006, this Author considers Q. texcocana and Q. tamiapensis as synonyms of Q.depressipes.