Oaks of the World

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 Quercus glaucoides
AuthorMart. & Gal. 1843
Synonyms baldoquinae Trel. 1924
cancellata Trel. 1924
conjungens Trel.1924
cordata Mart. & Gal. 1843
edwardsiae C.H.Muller 1942
glaucophylla Seemen ex Loes. 1900
harmsiana Trel.1924
Local namesencino chaparro ; canyon oak ; smoky oak ;
Range Center and South-West Mexico (Guerrero, Guanajuato, Hidalgo, Jalisco, Michoacan, Oaxaca, Querretaro, Mexico, Morales, Nayarit, Puebla, San Luis Potosi, Sinaloa, Zacatecas); 500-2200 m;
Growth habit 3-8 m tall, trunk 25-40 cm wide;
Leaves

4-12 x 2-7 cm; deciduous or semipersistent; coriaceous; elliptic to oblanceolate; apex rounded, sometimes acute or retuse; base round to cordate, sometimes slightly oblique; margin thickened, cartilaginous, flat or remotely revolute, crenate-dentate with 1-7 pairs of teeth; blue green, slightly lustrous, glabrous above or with a sparse pubescence made of stalkless, stellate trichomes and glandular hairs; yellowish green beneath, glabrous or with the same indumentum as above; 5-12 yellowish vein pairs, prominent on both sides; pruinose, glaucous, papillary epidermis; petiole 2-5 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; stalkless or on a 2-8 mm long peduncle; enclosed 1/3 by cup; cup with tomentose scales; cotyledons free; maturing in 1 year from June to November;

Bark, twigs and
buds

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; stipules4-5 mm long;
Hardiness zone, habitatnot hardy; prefers calcareous, dry sites;
Miscellaneous -- A. Camus : n° 201;
-- Section Quercus; subsection Glaucoideae;
--
No hybrids known yet;
-- Not to be confused with Q.glaucoides ( Schottky) Koidz. (=
Q.shottkyana).
-- For Susana Valencia-Avalos, 2004, Q.edwardsiae is a separate species in Nuevo Leon;
Subspecies and
varieties
 
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