Oaks of the World

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  Quercus microphylla
Author

Née 1801 Anales Ci. Nat. 3: 264

Diagnosis here

Synonyms frutex var. uhdeana Trel. 1924
macrocarpa Endl. 1848, nom. illeg. not Michx. 1801
microphylla var. uhdeana (Trel.) A.Camus 1939
repanda Benth. 1840, not Bonpl. 1809
Local names
Range Mexico (Aguascalientes, Durango, Guanajuato, Hidalgo, Jalisco, Nuevo Leon, Oaxaca, Puebla, Querétaro, Tamaulipas, Tlaxcala, Veracruz, Zacatecas) ; 2000-3000 m ;
Growth habit small shrub 0.4-1 m tall, branched even at base of trunk;
Leaves 1-3 x 0.7-1.8 cm; deciduous; sub-chartaceous; elliptic more or less narrowly, or oval; apex obtuse or rounded, often mucronate; base rounded or subcordate; margins flat or slightly revolute, entire or slightly toothed near apex (1-2 pairs of teeth); lustrous grey-green, rough above, with stalkless 6-8 rays stellate hairs; yellowish persistent tomentose beneath (fascicled stalkless trichomes with up to 15 rays); 4-7 veins pairs prominent beneath; epidermis bullate and papillose, whitish; petiole tomentose 2-4 mm;
Flowers pistillates flowers on a tomentose peduncle reaching 1cm long, 1mm thick;
Fruits

acorn 1-1.5 cm; globose to ovoid; mucronate; stalkless; singly or paired; enclosed 1/3 by scaly, half-round or flattened conical cup; rippening first year, from August to September;

Bark, twigs and
buds

bark fissured, not scaly, dark; twigs 1-4 mm in cross-section, glabrescent the second year; bud ovoid to globose, 1-2mm, brown, obtuse, with ciliate scales; lenticels unconspicuous;
Hardiness zone, habitat not hardy; prefers dry places;
Miscellaneous

-- A. Camus : n° 242;
-- Sub-genus Quercus, Section Quercus, Series Leucomexicanae, Group Microphyllae;

-- Possible confusion with Q. striatula but this species has subcoriaceous, 0.5-2 cm x 0.3-0.7 leaves, margins flat, and is not taller than 1 m;

Subspecies and
varieties
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