Oaks of the World

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 Quercus emoryi
AuthorTorr. 1848
Synonymsbalsequillana Trel. 1924
duraznillo Trel. 1924
hastata Liebm. 1854
Local namesEmory's oak; black-jack oak ; encino prieto ; bellota ;
Range West Texas to Central Arizona; Mexico (Chihuahua, Coahuila, Durango, Nuevo Leon, Sonora); 1200-2400 m;
Growth habit 2-5 m high, but may reach sometimes 15-20 m;
Leaves 2.5-7x 1-2.5 cm; subpersistent; thick, stiff; leathery; ovate to elliptic-oblong or lanceolate; apex pointed; base obtuse to cordate, less often truncate; margin thick, slightly revolute, entire or with 1-6 pairs of small aristate teeth; lustrous yellow green above, glabrous or with sometimes some stellate trichomes, essentially at the base of the midrib; less lustrous beneath, hairless or with axil tufts and glandular trichomes somewhat golden; 5-9 vein pairs, not evident; epidermis smooth or slightly bullate and white papillose; petiole glabrescent, 5-9 mm long;
Flowers flowers appear in April-May; male catkins 1-3 cm long, with 1-2 flowers 4-staminate; female inflorescence pubescent, very short, with a lonely flower;
Fruits acorn 1.2-1.9 cm, narrow; solitary; cup sessile (or with a very short peduncle to 2 mm), enclosing 1/4 to 1/3 of nut, pubescent inside, with thin, smooth, appressed scales; edible since a little bitter; maturing first year in August- September;

Bark, twigs and
buds

bark dark grey, thick, deeply furrowed; twigs slender, 1-3 mm in diameter, reddish brown, stiff, pubescent when young; bud 2-3 mm, ovoid, red brown, pubescent on the scales margin; stipules deciduous, 3-8 mm long;
Hardiness zone, habitathardy; all types of soils if dry ones; slow growing;
Miscellaneous-- A. Camus : n° 388;
-- section Lobatae ("black oaks"); sub-section Vimineae;
-- discovered by William H. Emory (U.S.A. 1811-1887 )
-- hybridizes with Q.graciliformis (= Q.x tharpii C.H.Muller), Q. hypoleucoides, and with Q.gravesii (= Q.x robusta);
Subspecies and
varieties
-- f. pinetorum Trel. 1924, particularily toothed;
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