Oaks of the World

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 Quercus peduncularis
AuthorNée 1801
Synonyms achoteana Trel. 1938
affinis Mart. & Gal 1843, nom. illeg.
aguana Trel. 1922
arachnoidea Trel. 1924  (A.Camus : n° 227)
barbanthera Trel.1925
barbeyana Trel. 1924
callosa Benth. 1842
dolichopus E.F.Warb. 1939
martensiana Trel. 1922
peduncularis subsp. callosa (Benth.) A.Camus 1939
peduncularis var. obovalis (Trel) A.Camus 1935
peduncularis f. macrodonta (Trel.) A.Camus 1935
pilicaulis Trel. 1924
tomentosa Willd. 1805
Local namesencino zopilote negro; mazcahuite;
Range Mexico (Chiapas, Colima, Guerrero, Jalisco, Mexico, Michoacan, Oaxaca, Puebla, Veracruz); 900 - 2600 m;
Growth habit 2 to 13 m tall; trunk to 30 cm in diameter; widespreading;
Leaves 5-13 x 2-6 cm; deciduous; thick, leathery; elliptic to oblanceolate or obovate; apex obtuse or acute; base obtuse to subcordate; margin thickened, revolute, cartilaginous, sinuate-dentate (7-10 mucronate teeth on each side); dark green, shiny, hairless above except stellaire hairs near base, with impressed veins; whitish, woolly beneath with stellate, stalked, tangled long hairs, with prominent veins; 9-14 rather straight vein pairs; epidermis glaucous, papillose and bullate; petiole slender, 3-8 mm long, somewhat pubescent, dark reddish brown;
Flowers

from March to May; staminate carkins 5-9 cm long, with numerous flowers; pistillate flowers 2-5, clustered at the tip of a 2-3 cm long, yellow hairy peduncle;

Fruits acorn 1 cm long, 1.2 cm in diameter; light brown; mucronate; singly or to 2-5 on a 2-3 cm long peduncle; enclosed 1/3 by cup; cup scaly 1.2-1.3 cm in diameter; maturing in 1 year from July to September;

Bark, twigs and
buds

bark grey furrowed; twigs 1.5-5 mm wide, smooth, tawny, at first with dense stellate tomentum, becoming glabrous the second year, with pale yellow lenticels; bud pointed 2-4 mm; stipules often persistent;
Hardiness zone, habitathardy; all types of soils; prefers dry sites;
Miscellaneous-- A. Camus : n° 224;
-- Section Quercus; sub-section Reticulatae;
-- For some Authors (Govaerts & Frodin), Q.archnoidea is a true species, in Salvador;
-- For Tracey Parker (Trees of Guatemala, 2008), Q. pilicaulis is a true species.
Subspecies and
varieties

For A. Camus, there are several subspecies:

1- subsp callosa (Benth) A.Camus 1939
= Q.callosa Benth. 1842

2- subsp pilicaulis (Trel.) A.Camus 1935
= Q.pilicaulis Trel. 1924 ( Govaerts & Frodin think it is a good species);

3- subsp hurteri (Trel.) A.Camus 1935
= Q.pilicaulis f. hurteri Trel. 1924

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