Oaks of the World

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 Quercus glaucescens
AuthorHumb. & Bonpl. 1809
Synonymscuneifolia sensu Liebm. 1854 (Camus = n° 290)
obscurirhachis Trel.
pinalensis Trel. 1922
chinantlensis Liebm. 1854 (A. Camus = n° 289)
Local namesTocuz; encino prieto;
Range Mexico (Michoacan, Oaxaca. Querretaro, Mexico, Nayarit, Veracruz, Guerrero, Jalisco); 250-1400 m;
Growth habit 6 to 20 m tall, trunk to 40 cm in diameter;
Leaves

10-16 x 4-6 cm; deciduous; leathery; oboval or elliptic; apex acute; base rounded or subcordate; margin thickened, revolute, crenate-dentate with 3-6 pairs of mucronate teeth ; light green, slightly lustrous, nearly hairless above (stalkless, stellate trichomes and dark glandular ones on veins); yellowish green beneath, nearly glabrous (pubescence made of small, sessile, stellate hairs and dark glandular ones at vein axils); 8-9 vein pairs; petiole 5-8 mm long, glabrous;

Flowers from March to May; staminate catkins 5-6 cm long, with numerous pubescent flowers; pistillate inflorescences 1 cm long, with 1-2 pubescent flowers;
Fruits acorn solitary 2-3 cm long; solitary or paired on peduncle 1-2 cm long; enclosed 1/3 by halfround cup; maturing first season (from June to August);

Bark, twigs and
buds

bark grey, scaly; twig 1.5-2 mm thick, glabrescent, shiny light brown, with few 0.5-1 mm lenticels; bud 2-4 mm, ovoid, with ciliate scales; stipules pubescent and deciduous
Hardiness zone, habitatnot hardy ;
Miscellaneous-- A. Camus : n° 200;
-- Section Quercus;
-- For Susana Valencia-Avalos (2004) the following species are synonyms of Q.glaucescens : Q.synthetica, Q.nigrirhachis and Q.texquitzinae.
-- For Govaerts, 2007, Q. chinantlensis is a true species, closely related to Q. glaucescens, in Mexico (Oaxaca, Veracruz)
Subspecies and
varieties
 
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