Oaks of the World

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  Quercus invaginata
Author Trel. 1924
Synonyms invaginata f. purpusiana Trel. 1924, nom. inval.
Local names  
Range Mexico (Coahuila, Chihuahua, Nuevo Leon); 1800-2000 m;
Growth habit shrub to 9 m, but often less than 3 m;
Leaves

2-5 x 1-3 cm; deciduous; leathery, rough; elliptic, oval or oblong; apex obtuse or acute; base obtuse or cuneate, often asymmetrical; margin wavy, thickened, revolute, with 1-4 pairs of mucronate teeth, seldom entire; dull green above, withe sparse fascicled hairs, glabrescent; paler beneath, with a dense tomentum made of sessile, stellate hairs; 6-10 vein pairs, weakly impressed above, strongly prominent below ; epidermis bullate and papillose; petiole tomentose, 3-7 mm long;

Flowers in May or June; male catkins 2-3 cm long, with numerous flowers; female inflorescences shorter, 0.5-1 cm, with 2-3 pubescent flowers;
Fruits acorn 1.5 cm long, 1 cm in diameter; ellipsoid; mucronate; grey at apex; solitary or 2-3 together on a 8-10 mm long peduncle; enclosed 1/3 to 1/2 by cup; cup turbinate, scaly, to 2 cm in diameter, with rim rolled inward (invaginate, hence the name); on the same tree one can find revolute acorn cup, and not revolute rim; maturing in 1 year in October;

Bark, twigs and
buds

bark grey, scaly or furrowed; terminal buds ovoid with deciduous stipules; twig densely pubescent;
Hardiness zone, habitat withstands -16° C;
Miscellaneous -- A. Camus : n° 257;
-- Section Quercus;
Subspecies and
varieties
 
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