Quercus cornelius-mulleri Nixon & K.P.Steele

USA (Californie : San Diego County) ; Mexico (Baja California) ; 400-2100 m ;

shrub to 1-2 (3) m tall, most often evergreen; numerous slender branches;

1.5-3.5 x 1-2 cm; oval or elliptic; thick, leathery; base cuneate or rounded; apex rounded sometimes pointed; margin entire or weakly dentate or wavy; 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 pubescent, 2-5 mm long;

male flowers small, on 2.5-5.5 cm catkins; in March-April;

acorn spindle-shaped, dark brown, 2-3 cm long; subsessile; top-shaped cup enclosing 1/4 to 3/4 of the nut; cup scales warty, whitish, glabrous inside; cotyledons distinct; maturing first year;

– 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);