Quercus oocarpa Liebm.

Mexico (Chiapas, Guerrero, Jalisco, Nayarit); Guatemala; Costa Rica; Panama; 1200-2000 m;

6-25 m; trunk to 1 m in diameter and more;

12-40 cm x 3-13; subevergreen; slightly coriaceous, chartaceous; oblanceolate, obovate or elliptic; apex acuminate or acute; base cuneate, obtuse or cordate; margin thick, flat or remotely revolute, slightly wavy, entire or dentate in the apical half, with 3-20 pairs of short mucronate teeth; adaxially green slightly lustrous, almost glabrous, with stellate, sessile trichomes having few arms, mainly on the veins; abaxially yellowish green, slightly lustrous, with rough, sessile trichomes scattered on the blade, essentially on veins; 12-22 veins pairs; the net of the secondary and tertiary veins is conspicuous; epiderm papillose, not bullate; petiole 3-5 mm long, with a rough tomentum;

acorn flattened, 2-3 cm long, 2.5-5 cm wide; singly or paired on a 1-2 cm long peduncle; cup half-round 3-6 cm wide, with pubescent scales, enclosing 1/4 to 1/2 of the nut; maturation the same year, in October;

– Sub-genus Quercus, Section Quercus, Series Leucomexicanae; – For Linares, J.L. 2005 (El Salvador), Q. oocarpa is a synonym of Q. insignis . – Related to Q. pilarius which differs in having slender, glabrate twigs, and mature leaves hard and hairless or nearly so;