| 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
( |
| Growth habit | 4-6 m (sometimes only 2 m at high elevations and in the North of its range); |
| Leaves |
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; |
| 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 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; |
| 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 varieties |
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| Pictures |
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