Quercus greggii (A.DC.)Trel.

Mexico ( Coahuila, , Hidalgo, Nuevo Leon, Oaxaca, Puebla, Querretaro, San Luis Potosi, Tamaulipas, Veracruz); 2000-3300 m, North of the 24th parallel;

4-6 m (sometimes only 2 m at high elevations and in the North of its range);

3-6 x 2-4 cm; semi-evergreen; elliptic, oboval, oblongue or sometimes suborbicular; thick, stiff and coriaceous; apex obtuse or rounded, mucronate or not; base subcordate to cordate; margin wavy, strongly revolute, entire or toothed in apical half (2-4 pairs of short teeth with mucro 2-5 mm long), seldom entire; dark greyish green, lustrous, rough above, with 15-rayed, short-stalked stellate trichomes; pale brownish or light yellowish, woolly tomentose beneath, with stipitate fasciate trichomes and abundant glandular ones; 6-10 pairs of secondary veins impressed adaxially, strongly prominent beneath; epidermis bullate and papillose; petiole 3-8 mm, densely pubescent;

in April; short male catkins (3-4.5 cm), with up to 18 flowers; female inflorescence pubescent, 1-3 cm long, with 2-4 flowers.

acorn 1-1,8 cm long, 1 cm in diameter; mucronate; 1 to 4 together, on a short peduncle 1.5-4 cm long; cup half-round, with thickenned scales at base, pubescent, enclosing 1/3 or 1/2 of nut; maturing in 1 year from August to October;

– A. Camus : n° 248; – Sub-genus Quercus, Section Quercus, Series Leucomexicanae, Group Reticulatae; – Possible confusion with Q. repanda , but the leaves of this species have veins slightly or not impressed adaxially, and moreover the geographical distribution is not the same : Q. repanda is found in the South of the 22th parallel, at less than 2300 m. – Possible confusion as well with Q. potosina , but this species has foliar margin weakly revolute, less coriaceous leaves, abaxial side of the leaf yellowish to golden because of the abundant glandular trichomes.