Quercus urbani Trel.

Mexico in the South of the Sierra Madre Occidental (Guerrero, Durango, Jalisco, Nayarit, Mexico, Sonora, Zacatecas); 1500 - 2500 m ;

6-12 m tall, with trunk to 0.3 m in diameter or more; thick branches very tomentose;

14-30 cm; deciduous; almost orbicular, oboval, oval-elliptic or panduriform; stiff; convex; reticulate epidermis adaxially ; apex rounded; base narrowly cordate; margin thick, revolute, cartilaginous, entire or wavy-dentate with 5-20 pairs of small aristate teeth at apical 2/3; adaxially pale green, lustrous, rough, glabrous except simple glandular hairs and stellate ones on veins; densely yellowish tomentose beneath with stalked stellate trichomes on the whole surface of the blade, trichomes with rayed to 3 mm long; 9-11 vein pairs, sinuous or curved, seldom straight; epidermis papillose and glandular; petiole 2-4 cm long, tomentose; young leaves conspicuously red and hairy;

in December-January; male catkins 10-20 cm long, with pubescent axis and numerous flowers; pistillate flowers on 4-5 cm long tomentose racemes;

acorn 8-10 mm long, ovoid; 6 to 10 together on a yellow tomentose stalk reaching 9 cm long; small cup, half-round, enclosing 1/3 or 1/2 of nut; maturing in 1 year, in October;

not hardy; poor calcareous soils;

– A. Camus : n° 311; – Sub-genus Quercus, section Lobatae, Subsection Erythromexicanae, Group Racemiflorae;