Quercus tuberculata Liebm.

Mexico (Aguascalientes, Chihuahua, Coahuila, Durango, Guanajuato, Michoacan, Nayarit, Sinaloa, Sonora); 900-2000 m ;

6-12 m tall; short trunk to 30 cm in diameter;

5-12 (-15) x 3-9 cm; deciduous; oblong, elliptic to oval, or oboval; leathery; apex obtuse to acute, sometimes emarginate; base round to cordate, seldom cuneate, often asymmetrical; margin thickened, slightly revolute, cartilaginous, entire, sometimes wavy-dentate (if teeth, 2-8 pairs of obtuse mucronate teeth); adaxially more or less dark yellowish or olive green, lustrous, glabrous or with some scattered sessile stellate hairs, mainly on veins and base of blade; paler, dull green beneath, glabrous or with some sessile stellate hairs along midvein; 8-10 vein pairs, slightly raised above, prominent abaxially; epidermis smooth, papillose; petiole 2-10 mm long, reddish, pubescent, glabrescent;

staminate catkins 5-8 cm long with numerous flowers; pistillate inflorescences to 3 cm, with 2-3 flowers;

acorn 1-2 cm long, 1-1.5 cm in diameter; ovoid or oblong-cylindrical; subsessil or on a stalk less than 5 mm long; enclosed 1/3 to 1/2 by cup; cup 1.4-1.6 cm in diameter, tomentose, with thick, strongly warty scales; maturing in 1 year from August to November;

not quite hardy;

– A. Camus : n° 197; – Sub-genus Quercus, Section Quercus, Series Leucomexicanae; – Related to Q.glabrescens , which it may be confused with, but Q. glabrescens has 2 cm long male catkins, leaves with shorter petiole and a margin with 3-5 pairs of teeth in the distal half, young twigs thinner, the peduncle of the acorn to 3 cm ;