Oaks of the World

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  Quercus tinkhamii
Author C.H.Muller 1942 Amer. Midl. Naturalist 27: 481
Synonyms  
Local names  
Range Mexico (Chihuahua, Hidalgo, San Luis Potosi, Nuevo Leon, Tamaulipas); 1400 m;
Growth habit 1.5-3 metres tall;
Leaves

2-5 x 0.7-2 cm; deciduous; subleathery; oblong or elliptic; apex acute to obtuse, with dark mucro; base obtuse to subcordate; margin thickened, not revolute, slightly undulate, entire or mostly with 2-6 pairs of mucronate teeth except near the base; adaxially green, lustrous, hairless or glabrescent with some scattered glandular hairs and stalkless, stellate ones at base of midvein; abaxially green, pubescent to glabrescent, with not appressed stellate trichomes, and most often glandular ones; 6-8 vein pairs not or very slightly impressed above, raised beneath; epidermis papillose; petiole 2-7 mm long, pubescent;

Flowers in July; male catkins 2 cm long, few-flowered; female ones 0.5 cm, with 1-2 pubescent flowers;
Fruits acorn 1-1.5 mm long, ovoid, singly or 2-3 together; stalkless or on a 2-5 mm long peduncle; cup half-round, with straight rim, 1-1.2 cm wide, with pubescent scales, enclosing 1/3 or 1/4 of the nut; maturing same year, in September-October;

Bark, twigs and
buds

bark grey, scaly; twig grey, 1-2 mm in diameter, pubescent with stalkless, stellate trichomes and glandular ones, persistent more than 1 year; bud reddish, 2-3 mm long; stipules short, pubescent, deciduous;

Hardiness zone, habitat  
Miscellaneous -- Sub-genus Quercus, Section Quercus;
-- Endangered species;
-- Possible confusion with Q. sebifera which is also a low shrub; but sebifera has oboval, oblanceolate to elliptic leaves, with 4-7 pairs of secondary veins, and the abaxial side is glabrous, glaucous and bloomy.
-- May be confused as well with Q. vaseyana;
Subspecies and
varieties
 
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