Quercus saltillensis Trel.

Mexico (Coahuila, Nuevo Leon, Tamaulipas, Zacatecas) ; 1900-2700 m;

usually 1-5 m; often less than 3 metres tall, seldom to 12 m;

2-5 cm long, 1-1.8 wide; slowly deciduous; subcoriaceous, thin, flexible, not held verticaly nor appressed to twig; lanceolate, elliptic or oblong, seldom oblanceolate; apex acute, bristle-tipped, seldom rounded; base rounded or heart-shaped; margin slightly revolute or flat, entire or with 1 or 2 bristle-tipped teeth near apex; lustrous dark green, somtimes with stellate hairs, glabrescent above; paler beneath, glabrescent, with a whitish, scratchable tomentum made of stellate trichomes, becoming rarer in summer (only at axils); 5-12 vein pairs, flat adaxially and slightly raised abaxially; epidermis smooth; petiole 2.5-8 mm long, glabrous or with the same tomentum as on the twigs;

male inflorescence 4-5 cm; female inflorescence 5-15 mm bearing 1-2 flowers;

acorn oblong, 0.5-1.5 cm long, singly or to 3, sessile or on a short stalk less than 0.5 cm; cup not rolled at rim, with flat, appressed, hairy scales, 1 cm in diameter, enclosing 1/2 of the nut; maturing in 1 year in September;

probably hardy, at least in zone 8; withstands -13°C;

– A. Camus : n° 370; – Sub-genus Quercus, section Lobatae, Series Erythromexicanae, Group Saltillenses;