Oaks of the World

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 Quercus uxoris
Author McVaugh 1972 Contr. Univ. Michigan Herb. 9: 513
Synonyms 
Local names 
Range Mexico, in the Sierra Madre del Sur (Jalisco, Colima, Guerrero, Chiapas, Oaxaca); 900 - 2500 m;
Growth habit 10-40 m, with trunk to 1 m in diameter, and more;
Leaves 9-25 x 4-10 cm; lately deciduous; more or less leathery; elliptic or oval; apex acute or acuminate, aristate; base obtuse, rounded or acute; margin thick, rolled under, dentate-serrate, with 9-18 pairs of bristle-tipped teeth (2-8 mm long); yound leaves with yellowish tomentum; mature leaves shiny green, becoming glabrous above except near base of midrib; paler beneath with short, stalked, stellate trichomes scattered on the blade and yellowish stellate axil tufts; 10-14 vein pairs, straight, impressed beneath; epidermis pale green, smooth, papillose; petiole 1.2.4 cm long, pubescent;
Flowers in March; staminate catkins 6-12 cm long, hairy, with more than 70 flowers; pistillate flowers 1-2 on a 0.5-1 cm long rachis;
Fruits acorn 1.5-2 cm long, 1.5 cm wide, flattened, apex covered with a fine, slightly golden tomentum; enclosed 1/3 or less by patelliform to slightly hemispherical cup, 1.5-2 cm wide, with pubescent appressed scales; maturing in 2 years from June to September;

Bark, twigs and
buds

bark dark brown; twigs 2-5 mm thick, densely golden-yellow pubescent first year, becoming hairless, red brown, with prominent pale lenticels; buds 2-7 mm long, ovoid, pointed, hairy at margin, coffee-coloured; stipules 7-15 mm long, sometimes persistent near terminal buds;
Hardiness zone, habitat not quite hardy; prefers dry sites;
MiscellaneousSub-genus Quercus, section Lobatae, sub-section Acutifoliae;  
Subspecies and
varieties
 
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