Oaks of the World

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  Quercus laxa
Author Liebm. 1854 Overs. Kongel. Danske Vidensk. Selsk. Forh. Medlemmers Arbeider 1854: 181
Synonyms callosa Mart. ex A.DC 1864
reticulata var. laxa Wenz. 1884
xylina Scheidw. 1837
Local names  
Range Mexico (Durango, Guanajuato, Sinaloa); 1850-3000 m;
Growth habit 3-5 m tall;
Leaves 4-8 x 3-5 cm; deciduous; leathery; thick, oboval, oblong-elliptic or oblong-oboval; apex obtuse (sometimes acute), mucronate; base rounded or cordate, sometimes asymmetrical; margin thick, revolute, with 3-6 rounded lobes or acute teeth each side; adaxially olive green, slightly lustrous, covered with sessile or nearly so, stellate and fascicled trichomes, glabrescent; abaxially paler, not lustrous, densely and persistently tomentose (fascicled and glandular trichomes); 7-12 vein pairs impressed above; epidermis bullate and papillose; petiole 5-10 mm long, tomentose at first, glabrescent;
Flowers male catkins 3 cm, with numerous flowers; female ones 5-10 mm long, with 1-5 pubescent flowers;
Fruits acorn 1.5-2 cm long; 2-3 together on a 6-9 cm long peduncle; cup less than 2 cm wide, with appressed scales, covering 1/2 or more of nut;

Bark, twigs and

grey, scaly bark; twigs yellowish, 2-4 mm thick, densely tomentose at first, then glabrescent; buds ovoid, 2-3 mm long, with marginally hairy scales; stipules persistent at least one year;
Hardiness zone, habitat hardy

-- A. Camus : n° 226 ;
-- Sub-genus Quercus, Section Quercus ;
-- Closely related to
Q.obtusata, but smaller acorn cup; possible confusion with Q. praeco, but this species has an acorn-cup rolled inside and the veins are not impressed adaxially; resembles as well Q. deserticola which differs in having stellate trichomes abaxially.
-- For some Authors (as Susana Valencia)
, Q. xylina is a true species.

Subspecies and