Quercus canbyi Trel.

Mexico (Coahuila, Nuevo Leon, Tamaulipas); Texas (Chisos Mountains ) ; from 0 to 2100 m in rocky canyons ; restricted area;

4-15 m tall, with trunk 20-50 cm in diameter; long flexible branches somewhat drooping;

4-10 x 1-4 cm; semi-evergreen or lately deciduous; thick, subleathery; lanceolate, elliptic, sometimes oval; apex pointed, bristle-tipped; base acute, obtuse or rounded; margin thick, slightly revolute, with 5-6 pairs of bristle-tipped, short teeth (from base to apex, or only on the apical 3/4) with shallow sinuses; dark lustrous green above, hairless or sometimes with shorts stellate hairs, and glandular ones, mostly along veins; dull, yellowish-green beneath, glabrous or with axil tufts of fascicled hairs; 5-7 vein pairs, mostly straight, flat above, slightly raised beneath; epidermis slightly papillose ; petiole hairless, slender, flexible, 1-2 cm long;

April-May; male catkins pubescent, 3-9 cm long, with 20-30 flowers with 5-6 stamens and glabrous anthers; pistillate ones 0.5-1 cm long, 1 or 2-flowered;

acorn 1-1.5 cm, ovoid; peduncle 2-5 mm long; singly or to 2 together; cup covering 1/2 of nut, with nearly flat scales; maturing in 1 year from August to October;

hardy zone 7; prefers dry, rocky soils;

– A. Camus : n° 384; – Sub-genus Quercus, section Lobatae, Series Erythromexicanae, Group Acutifoliae; – Confusion is possible with Q. albocincta , which has ovate or elliptic leaves, more veins pairs, longer teeth, longer bristle-tips and longer petioles. – Resembles Q. affinis but this species has coriaceous leaves, shorter petioles , 2-4 pairs of teeth, and the acorn matures in 2 years;