Oaks of the World

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  Quercus glaucoides
Author Mart. & Gal. 1843 Bull. Acad. Roy. Sci. Bruxelles 10(1): 209
Synonyms baldoquinae Trel. 1924 Diagnosis here
cancellata Trel. 1924 Diagnosis here
conjungens Trel.1924 Diagnosis here
cordata Mart. & Gal. 1843
edwardsiae C.H.Muller 1942
glaucophylla Seemen ex Loes. 1900
harmsiana Trel.1924 Diagnosis here
Local names encino chaparro ; canyon oak ; smoky oak ;
Range Center and South-West Mexico (Guerrero, Guanajuato, Hidalgo, Jalisco, Michoacan, Oaxaca, Querretaro, Mexico, Morelos, Nayarit, Puebla, Zacatecas); 500-2200 m;
Growth habit 3-8 m tall, trunk 25-40 cm wide;

8-12 x 4-7 cm; deciduous or semipersistent; coriaceous; obovate, elliptic, oblong to oblanceolate; apex rounded, sometimes acute or retuse, mucronate, rarely emarginate; base round to cordate, sometimes slightly oblique; margin thickenned, not or slightly revolute, entire or crenate-dentate with 4-7 pairs of obtuse, broad, mucronate teeth; blue green, dull, glabrous above or with at base a sparse pubescence made of stellate trichomes; yellowish green beneath, glabrous or seldom with scarce and scatterd stellate trichomes and glandular ones; 6-12 yellowish vein pairs, prominent on both sides, more abaxially than adaxially; pruinose, glaucous, papillose epidermis; petiole 2-7 mm, often dark reddish, glabrescent, pruinose;

Flowers in April-May; male catkins 6 cm long, with numerous flowers; pistillate ones to 9 cm long, bearing 1-20 pubescent flowers;
Fruits acorn 0.8-1.3 cm, ovoid, brown; paired or to 3; on a 3-4 cm long, glabrous peduncle; enclosed 1/3 by cup; cup with tomentose scales; cotyledons free; maturing in 1 year from July to November;

Bark, twigs and

bark scaly, dark grey; twig 1-3 mm thick, yellowish grey with numerous light brown lenticels; bud 1-2,5 mm, ovoid conical, obtuse, dark brown; stipules 4-5 mm long;
Hardiness zone, habitat not hardy; prefers calcareous, dry sites;
Miscellaneous -- A. Camus : n° 201;
-- Sub-genus Quercus, Section Quercus, Subsection Leucomexicanae, Group Glaucoideae;
No hybrids known yet;
-- Not to be confused with Q.glaucoides ( Schottky) Koidz. (=
-- For Susana Valencia-Avalos, 2004, Q.edwardsiae C.H. Mull 1942 (Amer. Midl. Naturalist 27: 472) is a separate species in Nuevo Leon;
-- Easely recognized by its glaucous, dull and glabrous leaves, with entire or crenate margin or with 4-7 pairs of basally broad, mucronate teeth at margin.

Subspecies and
-- Actually polymorphous leaves leading to the description of several forms, such as : f. lobata, f. longifolia, f. subrotundifolia