Quercus zempoaltepecana Trel. 1924
Twigs rather slender (2-3 mm.), somewhat fluted, soon glabrous, dull blackish red with small
pale lenticels. Buds dull brown, glabrous, ovoid, 2-3 x 4 mm. Leaves deciduous ?, more or less
ovately elliptical, very obtuse to acute, obliquely rounded to subacute at base, undulate or entire
to distantly toothed, at least toward the apex, the broadly triangular sharply setaceous teeth often
falcately recurved, minutely cartilaginous-revolute, moderate (2 x 5-6, on young shoots, to mostly
3-4 x 7-9 cm.), slightly glossy and glabrous above, rather paler, dull and occasionally with axillary
tufts beneath; veins about 6-8 pairs, irregularly and unequally looped, finely raised-reticulate on
both faces; petiole glabrous, winged, about 1.5 x 10 mm. Catkins? Fruit annual, mostly solitary
and sessile or the peduncle scarcely 5 mm. long; cup turbinate, rather small (12-15 mm. in diameter),
with thin appressed blunt brown-puberulent scales; acorn ovoid, fully half-included.
Cordilleran region of Mexico.