Quercus oblongifolia Torrey 1853

Twigs short, slender (2 mm.), scarcely fluted, quickly glabrous, often pruinose,
somewhat flesh-colored. Buds red, glabrous but with ciliate scales, ovoid, 2 mm.
in diameter. Leaves deciduous?, elliptical or somewhat oblong, rounded at both
ends or slightly cordate, entire to coarsely crenately toothed, small (1-2 x 3-4 or
exceptionally 3.5 x 8 cm.), glabrous, rather dull above, paler and very dull beneath,
rather thick and flat with narrowly cartilaginousthickened margin; veins about 6-8 pairs,
unequal, the heavier looped, rather prominent beneath like the veinlets; petiole pale,
usually somewhat pruinose, 1 x 5 mm. Catkins: male 30 mm. long, from stellate-cobwebby
glabrescent, rather closely flowered, the round glabrous anthers little exserted. Fruit annual,
solitary or paired, sessile; cup half-round, rather small (12 mm. in diameter), with keeled
appressed rather broad and blunt vellow-puberulent or when abraded reddish scales;
acorn ovoid, pale, one-third included.
Western Sierra Madre region, on both sides of the international boundary.