Quercus durangensis Trel. 1924

Twigs rather stout (3-5 mm.), fluted, stellate-pilose through the first season, then
dull light brown with rather inconspicuous lenticels. Buds dull light brown, from
hairy glabrescent, ovoid, 2 x 3 mm., the upper with investing stipules. Leaves
deciduous, obovate, very obtuse, shallowly cordate, often dentate from below
the middle, rather large (7-9 x 8-12 cm.), the slightly convex impressed-veiny upper
surface glossy and glabrescent or with puberulent midrib, the prominently veiny
lower surface glabrate and granular-bullate; veins about 8-10 pairs, somewhat
forking but scarcely looped; petiole glabrate, 2 x 4 mm. Catkins?. Fruit annual,
several at end of a loosely stellate or glabrate peduncle about 1 x 40 mm.; cup
halfround, small (10 mm. in diameter), with thin somewhat loose acuminate
brown-tipped scales dingy tomentose below; acorn ovoid, 10 mm. long, about
one-third included.
Western Sierra Madre region of Mexico.