Quercus aurantiaca Trel. 1924

Glabrous. Twigs moderate (3 mm.), scarcely fluted, orange with prominent
small lenticels, becoming gray in the second or third year. Buds rather dull
brown, glabrous, round-ovoid, 2-3 x 4-5 mm. Leaves deciduous ?,
elliptical-obovate, mostly very obtuse, rather acute at base, shallowly crenately
toothed, minutely cartilaginous-revolute, moderate (4-5 x 10-14 cm.), glossy
above, paler and duller beneath; veins about 10-12 pairs, looped; petiole
brown, 5 to mostly 10 mm. long. Catkins?. Fruit annual, usually subsessile,
solitary or paired; cup saucer-shaped, rather large (15-20 mm. in diameter),
with rather tuberculate-keeled acute appressed puberulent scales; acorn ovoid,
about 18 mm. long, less than half-included.
Western Sierra Madre region of Mexico.