Oaks of the World

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 Quercus engelmannii
AuthorGreene 1889
Synonyms 
Local namesEngelmann's oak; mesa oak ; evergreeen white oak ;
RangeNortheast California, Santa Catalina Island; Mexico; to 1200 m; restricted area;
Growth habitreaches 15 m high, with trunk to 70 cm in diameter; branches low on the trunk; crown open, spreading;
Leaves 2.5-7 x 1.2-2.5 cm; evergreen or nearly so (leaves may fall during drought summers); oblong or elliptic; thick, leathery; apex rounded; base variable; margin entire or minutely dentate near apex; blue green, glabrous, smooth, not rough above; yellow green beneath with stellate trichomes with long rays; 7-8 vein pairs, inconspicuous; petiole 3-7 mm;
Flowersmale flowers in spring on 3-4 cm catkins;
Fruitsacorn pale grey, elliptic, subsessile, striate near apex; cup enclosing 1/3 to 1/2 of nut, strongly warty near the base; maturing in 1 year;

Bark, twigs and
buds

bark light grey, finely striate; twigs stiff, brown, hairy; bud red brown, globose, glabrous, 1-2 mm;
Hardiness zone, habitatalmost hardy (withstands -14°C); all types of soils, prefers moist ones;
Miscellaneous-- section Quercus;
-- A. Camus : n° 181 ;
-- closely related to
Q.oblongifolia Torr., and maybe conspecific, with cup scales larger and more warty;
-- George Engelmann (1809-1884) was botanist at Saint-Louis, of German origin;
-- hybridizes with Q.dumosa and Q.lobata.
Subspecies and
varieties
 
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