Quercus colimae Trel. 1924

Twigs slender (2 mm), somewhat fluted, rather persistently scurfy, with scarcely evident lenticels.
Buds rather dull red brown, glabrescent, ovoid, about 2 x 3 mm. Leaves deciduous elliptical rounded
at both ends, for a time mucronate, entire, revolute, small (1.5-2.5 x 4-7 cm.), glabrous above except
for the puberulent midrib and raised-venulose except that the primaries and some secondaries are
impressed toward the margin, detachably tawny-fleecy beneath the denuded surface bullate-granular;
veins about 15 pairs, unequal, branched and irregularly looped; petiole puberulous, scarcely 5 mm. long.
Catkins?. Fruit biennial solitary or paired on very short stalks; cup half-round or somewhat contracted
toward the base, rather large (20 mm. m diameter), with somewhat thick-based appressed bluntly
acuminate glabrescent and brown scales; acorn ovoid, nearly 20 mm. in diameter, about half-included.
Western Sierra Madre region of Mexico