Quercus arizonica Sarg.

Arizona, Texas, New Mexico; Mexico (Chihuahua, Coahuila, Durango, Sonora); 1300-2500 m;

8-12 m. but reaches 18 m, with a 1 m wide trunk; crown irregular;

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;

male catkins 1.5-3 cm long, numerous flowers with 5-8 stamens; female inflorescences 1-2 cm long, with 2-6 pubescent flowers;

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;

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 ;