Quercus subavenia Trel. 1924

Twigs slender (2 mm.), somewhat fluted, rather persistently stellate-scurfy, from blackish
becoming gray. Buds dingy brown, glabrous, round-ovoid, 2 x 3 mm. Leaves subevergreen,
shortly lance-elliptical, mucronately acute, rather rounded at base, entire or exceptionally
shallowly few-toothed above, small (1.5-2.5 x 4-4.5 cm.), slightly glossy, glabrous, or somewhat
minutely stellate on the upper face; veins about 10 pairs, looped, the venulation little evident;
petiole glabrescent, 2 x 5 mm. Catkins: male 50 mm. long, scurfy, rather closely flowered, the
glabrous ellipsoid anthers little exserted; female scarcely 5 mm. long, with 1 or 2 flowers at the
end. Fruit biennial, single or paired on a short stalk; cup somewhat turbinately saucer-shaped,
moderate (15 mm. in diameter), with appressed blunt glabrous and glossy light brown scales,
the lower somewhat keeled; acorn ovoid, minutely silvery-scurfy, one-third included.
Cordilleran region of Mexico.