Oaks of the World

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  Quercus gulielmi-treleasei

C.H.Muller 1942 Misc. Publ. U.S. Dept. Agric. 477: 58

Diagnosis here

Synonyms chiriquina Trel. ex C.H.Mull. 1942
seemannii var. gulielmi-treleasei (C.H.Mull.) E.Murray 1983
seemannii subsp gulielmi-treleasei (C.H Mull.) E.Murray 1983
Local names
Range Costa Rica (2600 m) ; Panama (1500 m) ;
Growth habit more than 30 m;
Leaves 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;
Fruits 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;

Bark, twigs and

bark greyish black or dark brown; twigs 1.5-4 mm thick, soon glabrous, with conspicuous lenticels; bud 3-4 mm long, ovoid, with slightly pubescent and lustrous scales; stipules soon deciduous;
Hardiness zone, habitat not hardy;
Miscellaneous -- 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.

Subspecies and