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

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.

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;

Bark, twigs and

bark dark grey, scaly; twig 2-4 mm thick, yellowish grey, with small, prominent, inconspicuous lenticels, tomentose first year, becoming glabrescent; bud hairy, reddish, subglobose, 2-3 mm long;  stipules 4-7 mm long, persistent around terminal bud;
Hardiness zone, habitat hardy in zone 7;
Miscellaneous -- 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.

Subspecies and