Oaks of the World

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  Quercus cornelius-mulleri
Author Nixon & K.P.Steele 1991 Madroņo 28: 210
Local names Muller's oak ;
Range USA (Californie : San Diego County) ; Mexico (Baja California) ; 1000-1800 m ;
Growth habit shrub to 1-2 (3) m tall, most often evergreen; numerous slender branches;
Leaves 1.5-3.5 x 1-2 cm; oval or elliptic; thick, leathery; base cuneate, apex rounded sometimes pointed; margin entire or weakly dentate; 6-7 vein pairs; light dull green above with appressed stellate hairs; whitish beneath, densely covered with numerous stellate hairs; midrib often yellowish; small radiate trichomes; petiole 2-5 mm;
Flowers male flowers small, on 2.5-5.5 cm catkins; in March-April;
Fruits acorn spindle-shaped, dark brown, 2-3 cm; subsessile; top-shaped cup enclosing 1/4 to 3/4 of the nut; cup scales warty, whitish, glabrous inside; cotyledons distinct; maturing first year;

Bark, twigs and

bark grey, scaly; twigs yellow brown, densely tomentose; buds brown, ovoid, glabrous, 2.5-3 mm;
Hardiness zone, habitat dry sites;
Miscellaneous -- Sub-genus Quercus, Section Quercus, Subsection Dumosae;
-- Different from other shrubby Californian oaks (bicoloured leaves with tomentose undersides, large acorns enclosed by deep warty cups);

Subspecies and
-- hybridizes with Q.engelmannii (= x acutidens), and with Q.lobata (= x munzii) ;