Oaks of the World

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  Quercus arizonica
Author Sargent 1895 Gard. & Forest 8: 89 1895.
Synonyms arizonica Wooton & Standl. 1924
arizonica var. wootonii Trel. 1924
endemica C.H.Muller 1942
sacame Trel. 1924 Diagnosis here
Local names Arizona white oak; napaco;
Range Arizona, Texas, New Mexico; Mexico (Chihuahua, Coahuila, Durango, Sonora); 1300-2500 m;
Growth habit 8-12 m. but reaches 18 m, with a 1 m wide trunk; crown irregular;
Leaves 3-10 x 1.5-3 cm, evergreen; oblong; thick and leathery; elliptic to oblanceolate or oboval; apex obtuse or slightly pointed; base cordate or rounded; margin toothed except near base (1-6 teeth with a strong mucro at tip), revolute, sometimes almost entire; glaucous, very rough above with persistent, scattered, stellate hairs, and secondary veins not conspicuous; dull yellowish grey beneath, pubescent at first then glabrescent (curly stellate hairs), with raised veins; 7-11 vein pairs, straight or slightly curved; petiole 3-10 mm long;
Flowers male catkins 1.5-3 cm long, numerous flowers with 5-8 stamens; female inflorescences 1-2 cm long, with 2-6 pubescent flowers;
Fruits acorn 0.8-1.2 cm, light coffee coloured, glabrous, singly or paired (sometimes more) on a very short peduncle (0-1.5 cm), with often umbilicate stylopodium; enclosed 1/3 by half-round cup with tomentose scales, tuberculate at base; cotyledons connate; maturing in 5-6 months;

Bark, twigs and

grey bark very thick (to 2.5 cm), deeply furrowed; twig yellowish, with persistent fasciate tomentum; buds ovate 2-4 mm long, light brown, with scales pubescent at margin; stipules linear, 4-8 cm long, sometimes persistent.
Hardiness zone, habitat hardiness : zone 7; occurs in moister sites than Q.grisea;

-- Sub-genus Quercus, Section Quercus, Series Leucomexicanae; ;
-- Closely related to Q.grisea; numerous hybrids between these 2 species, named Q.x organensis;

Subspecies and