Oaks of the World

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  Quercus x warburgii
Author A. Camus 1939
Synonyms robur x rugosa
= obtusata Henry, not Bonpl.
Local names  
Range  
Growth habit tall semi-evergreen tree;
Leaves 6-12 cm long, 3-7 cm wide; leathery, obovate to oblanceolate; apex rounded; base tapered, sometimes weakly auricled; margin with shallow, small lobes; dull green, rough above; lighter green beneath; both sides glabrous; copper-coloured leaves in spring;
Flowers  
Fruits 2.5 cm long, single or paired; rather thin stalk; cup hemispherical enclosing 1/3 of nut;

Bark, twigs and
buds

young shoots glabrous, greenish brown;
Hardiness zone, habitat hardy zone 7;
Miscellaneous -- before 1939, date of taxon description by A. Camus, it was named Q.obtusata ; in 1933, Warburg admitted it is a hybrid;
-- it is not quite sure that parents are robur and rugosa.
-- At Cambridge, one of the 2 original trees (the other being at Kew) reaches 20 m high, for a trunk 2m in diameter.
Subspecies and
varieties
 
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