Oaks of the World

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  Quercus peduncularis

Née 1801 Anales Ci. Nat. 3: 270

Diagnosis here


affinis Mart. & Gal 1843, nom. illeg.
barbanthera Trel.1925 Diagnosis here
callosa Benth. 1842
crassifolia Benth. 1840, nom. illeg., non Bonpl. 1809
dolichopus E.F.Warb. 1939
martensiana Trel. 1922 Diagnosis here
peduncularis subsp. callosa (Benth.) A.Camus 1939
peduncularis var. obovalis (Trel) A.Camus 1935
peduncularis f. macrodonta (Trel.) A.Camus 1935
peduncularis subsp pilicaulis (Trel.) Camus 1939
pilicaulis Trel. 1924 Diagnosis here

pilicaulis f. macrodonta and f. obovalis Trel. 1924
splendens Née 1801
tomentosa Willd. 1805

Local names encino zopilote negro; mazcahuite;
Range Mexico (Chiapas, Colima, Guerrero, Jalisco, Mexico, Michoacan, Oaxaca, Puebla, Veracruz); 900 - 2600 m;
Growth habit 2 to 4 m tall; trunk to 30 cm in diameter; widespreading;
Leaves 5-10 x 2-5 cm; deciduous; thick, leathery; elliptic, oblanceolate or obovate; apex obtuse or acute; base obtuse to subcordate; margin thickened, revolute, cartilaginous, sinuate-dentate in the distal half (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; petiole slender, 3-5 mm long, somewhat pubescent, dark reddish brown;

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

Fruits acorn 1 cm long, 1.2 cm in diameter; light brown; mucronate; singly or more often 2 to 5 on a 3-4 cm long peduncle; enclosed 1/3 to 2/3 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 2-2.5 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, habitat hardy; all types of soils; prefers dry sites;
Miscellaneous -- A. Camus : n° 224;
-- Sub-genus Quercus, Section Quercus, Subsection Leucomexicanae, Group Reticulatae;
-- For Tracey Parker (Trees of Guatemala, 2008), Q. pilicaulis is a true species.

Subspecies and

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
This taxon is placed by S. Valencia & A. Coombes 2020 in synonymy with Q. purulhana