Oaks of the World

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 Quercus chihuahuensis
AuthorTrel. 1924
Synonymsinfralutea Trel. 1924
jaliscensis Trel. 1921
santaclarensis C.H.Muller 1938
Local namesChihuahuan oak ; felt oak ; encino miscalme ;
Range Mexico (Aguascalientes, Chihuahua, Durango, Guanajuato, Jalisco, Nayarit, Nuevo Leon, Sinaloa, Sonora, Zacatecas, San Luis Potosi); 1400 - 2000 m;
Growth habit5-8 m; trunk to 0.3-0.4 m in diam.; spreading crown;
Leaves 4-10 x 2-5 cm; late deciduous; leathery; oboval or sometimes elliptic; not convex; apex obtuse, sometimes subacute or mucronate; base rounded or subcordate; margin entire or sinuate-dentate (if so, with 1-4 pairs of teeth ending in a mucro), flat or sometimes revolute, thick; yellowish blue-green, at first densely fascicled (3-8 rays) tomentose above, then glabrescent; paler below, densely tomentose with stipitate fascicled hairs; 8-10 vein pairs, prominent on both sides, sometimes slightly impressed adaxially; epidermis pale green or glaucous, papillose and glandular; petiole 3-10 mm, tomentose;
Flowers spring; staminate carkins tomentose, 2-5 cm long, with numerous flowers; pistillate flowers at the tip of a stout, tomentose, to 5 mm long peduncle.
Fruits acorn 1.5 cm, ovoid, light brown; solitary or paired; peduncle pubescent 1.5-5 cm; 1/2 enclosed by cup; cup with densely tomentose scales; maturing first year from June to November; cotyledons connate;

Bark, twigs and
buds

bark grey, sulcate, broken into square plates; twigs 2-3 mm wide, grey densely tomentose; buds brown, yellowish pubescent, 2-4 mm long; 1-4 deciduous stipules at base of terminal buds;
Hardiness zone, habitat hardy zone 7; all types of soils, but prefers dry ones;
Miscellaneous-- A. Camus : n° 256 ;
-- section Quercus; sub-section Chihuahuenses;
-- rare in USA, where it forms hybrids with
Q.grisea and Q.arizonica (= Q. x undata Trel.)
-- For Zavala-Chavez, 2003, Q.infralutea is a variety of Q.invaginata.
-- Possible confusion with Q. grisea, which has stalkless stellate trichomes; also with Q. deserticola which has midrib and secundary veins impressed above and margins markedly revolute.
Subspecies and
varieties
-- numerous formas described by Trelease;
Pictures