Quercus gulielmi-treleasei C.H.Mull.

Costa Rica (2600 m) ; Panama (1500 m) ;

more than 30 m;

8-20 cm long, 2-6 wide; evergreen or tardily deciduous; narrowly elliptic-oblong, to lanceolate or oblanceolate, often assymetrical or curved on one side; base cuneate or attenuate; apex acuminate, sometimes bristle-tipped; margin entire, slightly wavy; dark green, hairles, shiny above; sometimes some stellate hairs at base and along midrib beneath; 15-20 vein pairs impressed above, prominent beneath; petiole 3 mm long, stellate pubescent;

acorn subglobose, 1.2 cm in diameter; apex flattened; singly or paired on a 2-4 cm long peduncle; enclosed 1/3 or less in cup; cup more or less deep, with pubescent scales; basal scar 7-9 mm long; maturing in 1 year;

not hardy;

– A. Camus : n° 354; – Sub-genus Quercus, section Lobatae, Series Erythromexicanae; – Threatened (IUCN Red List Category : VU). – Very closely related (variety, subspecies, ecotype ?) to Q. seemannii (= Q. salicifolia subsp seemannii ) – For Burger, in 1977, Q.seemannii is a complex, because of its great variability, integrating probably Q. gulielmi-treleasei and Q. tonduzii. It is also the opinion of Francisco Morales in 2001. – See HERE to compare with other whole-leaved oaks .