Oaks of the World

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 Quercus greggii
Author (A.DC.)Trel. 1922
Synonyms derrumbaderoensis C.H.Mull. 1942
greggii f. subglabrata C.H.Muller 1944
loesenerii Trel. 1924 (A. Camus = n° 250)
reticulata var. greggii A.DC 1864
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 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; brownish woolly tomentose beneath, with stipitate fasciate trichomes and glandular ones; 6-9 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 0,5-3 cm long; cup half-round, with thickenned scales at base, pubescent, enclosing 1/2 of nut; maturing in 1 year;

Bark, twigs and
buds

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;
-- 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.
Subspecies and
varieties
 
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