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Quercus glaucescens | |
Author |
Bonpl. 1809 Pl. Aequinoct. 2: 29 Diagnosis here |
Synonyms | cuneifolia sensu Liebm. 1854 (Camus = n°
290) Diagnosis here obscurirhachis Trel. pinalensis Trel. 1922 Diagnosis here chinantlensis Liebm. 1854 (A. Camus = n° 289) Diagnosis here |
Local names | Tocuz; 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 |
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; |
Hardiness zone, habitat | not
hardy ; |
Miscellaneous | -- A. Camus : n° 200; -- Sub-genus Quercus, Section Quercus, Series Leucomexicanae; -- 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 (Overs. Kongel. Danske Vidensk. Selsk. Forh. Medlemmers Arbeider 1854: 179 1854.) is a true species, closely related to Q. glaucescens, in Mexico (Oaxaca, Veracruz) |
Subspecies and varieties |
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Pictures |