Oaks of the World

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  Quercus delgadoana
Author S. Valencia Avalos, K.C.Nixon & L.M.Kelly 2011
Synonyms  
Local names  
Range Mexico, in the Sierra Madre Oriental (Hidalgo, Puebla, Veracruz); 1400-2200 m;
Growth habit 25 m tall; trunc to 1 m in diameter;
Leaves 7-18 x 1.5-5 cm, narrowly oblong, elliptic or lanceolate; leathery; both sides glaucous, but paler beneath; apex pointed or acuminate, aristate; base rounded ou cuneate; margin entire, slightly thickened, revolute; adaxially hairless, without stellate or glandular trichomes; abaxially glabrous or with sometimes some fasciate hairs at axils; (9-)14-20 vein pairs, impressed above and slightly raised beneath, parallel, nearly straight, branched and anastomosed near margin; slightly papillar epidermis; petiole thin, 2-6 mm long, darkened near base;
Flowers pistillate inflorescence at leaves axils, with flowers solitary or paired on a 1.8-2 mm long peduncle;
Fruits acorn ovoid, 2 cm long, 1,2 cm wide, glabrous outside; solitary or paired, short hairless peduncle; cup conical or slightly turbinate, 0.6-1.5 cm in diameter, with margin not rolled, ovate scales that are greyish near base, more or less glabrous; maturing in 2 years, in October-November;

Bark, twigs and
buds

twigs 2-3 mm thick, hairless, with inconspicuous lenticels; buds conical, hairless, 1-2.5 mm long, with more or less elongate scales ciliate at margin; deciduous stipules;
Hardiness zone, habitat hardy zone 8; wet montane forests;
Miscellaneous

-- Section Lobatae;
-- Very rare, threatened;
-- Differs from Q. salicifolia (= eugeniifolia) and from Q. sapotifolia essentially in having acorns maturing in 2 years, and from Q. laurina and Q. affinis in having revolute margin and more secondary veins.

Subspecies and
varieties
 
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