Oaks of the World

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  Quercus oocarpa

Liebm. 1854 Overs. Kongel. Danske Vidensk. Selsk. Forh. Medlemmers Arbeider 1854: 184

Diagnosis here

Synonyms glabrescens Seem. 1854, non Benth. 1840
insignis var. ou subsp oocarpa (Liebm.) E.Murray 1983
warszewiczii Liebm. 1854 Diagnosis here
yunckeri Trel. 1938
Local names

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

Growth habit 6-25 m; trunk to 1 m in diameter and more;
Leaves 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;
Fruits 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;

Bark, twigs and

bark scaly, grey; twigs grey or yellowish, sulcate, 3-5 mm thick, with tomentum persistent more than one season, made of numerous, rough, multiradiate, sessile trichomes, 1 mm long; lenticels hardly visible; bud ovoid 4-7 mm long, brown, with scales pubescent along margins; stipules linear 1-1.3 cm long, pubescent, deciduous, sometimes persistent.
Hardiness zone, habitat
Miscellaneous -- 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;

Subspecies and