Oaks of the World

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 Quercus greggii
Author (A.DC.)Trel. 1922 Contr. U. S. Natl. Herb. 23: 185
Diagnosis here
Synonyms derrumbaderoensis C.H.Mull. 1942
greggii f. subglabrata C.H.Muller 1944
loesenerii Trel. 1924 (A. Camus = n° 250) Diagnosis here
reticulata var. greggii A.DC 1864
reticulata f. pungens C.H.Mull. 1936
Local names 
Range Mexico (Coahuila, Durango, Hidalgo, Nuevo Leon, Puebla, Querretaro, San Luis Potosi, Tamaulipas, Veracruz); 2000-3300 m, North of the 24th parallel;
Growth habit 5-7 m (sometimes only 2 m at high elevations and in the North of its range);
Leaves 3-6 x 2-4 cm; semi-evergreen; broadly elliptic to oboval, seldom oval; thick, stiff and leathery; apex obtuse or rounded, mucronate or not; base rounded or cordate; margin wavy, strongly rolled under, toothed in apical half (3-6 pairs of short teeth with mucro 2-5 mm long), sometimes entire; thick midrib and lateral veins; dark greyish green, shiny but rough above, with 15-rayed, short-stalked stellate trichomes; pale brownish or light yellowish, woolly tomentose beneath, with stipitate fasciate trichomes and glandular ones; 6-8 pairs of secondary veins impressed adaxially, strongly prominent beneath; epidermis bullate and papillate; petiole 0.5-0.8 cm, densely pubescent;
Flowers 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.
Fruits acorn 1-1,8 cm long, 1 cm in diameter; mucronate; 1 to 4 together, on a short peduncle 5-6 mm long; cup half-round, with thickenned scales at base, pubescent, enclosing 1/2 of nut; maturing in 1 year;

Bark, twigs and

bark dark grey, scaly; twig slender, yellowish grey, with small prominent lenticels, tomentose first year, becoming glabrescent; bud hairy, reddish, subglobose, 2-3.5 mm long;  stipules 4-7 mm long, persistent around terminal bud;
Hardiness zone, habitathardy in zone 7;
Miscellaneous -- A. Camus : n° 248;
-- Sub-genus Quercus, Section Quercus; sub-section 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.
Subspecies and