Oaks of the World

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  Quercus ariifolia
Author Trel. 1924 Mem. Nat. Acad. Sci. 20:74, pl. 97. 1924
Local names
Range Mexico, in the Sierra Madre Oriental (Hidalgo, Nuevo León, Puebla, Queretaro, San Luis Potosi and Veracruz); 1900-2890 m;
Growth habit 7-15 (-20) m ;

6-12 cm x 3-7; coriaceous; obovate, elliptic, rarely ovate; flat abaxially; apex obtuse; base rounded to subcordate; margin revolute, with 2-4 pairs of mucronate teeth; adaxially rugose, glabrous or with fasciculate hairs along midrib; abaxially tomentose, made of whitish fasciculate trichomes, with long crispate rays, and sometimes with glandular trichomes; 7-11 veins pairs, ascending, straight or mederately curved, impressed above, prominent beneath; epidermis bullate and papillose; petiole 0.6-1 cm tomentose to glabrescent, with fasciate trichomes;

Flowers in May;
Fruits acorn ovoid to globose, 1-1.5 cm long, 1 to 5 or more together on a 2-7 cm long pubescent peduncle; included 1/4 to 1/2 in the cup; cup halfround 1.2-1,4 cm long and in diameter, with margin erect, and smooth triangular scales; maturing first year in September and October;

Bark, twigs and

twig 2-4 mm thick, grey, tomentose, with pale inconspicuous lenticels; bud ovoid or conical, 2-4 mm long with ciliate, brown scales; stipules 5-7 mm long, persisting at the apex of the twig;
Hardiness zone, habitat oak forest ;

-- Sub-Genus Quercus, Section Quercus, Série Leucomexicanae, Group Reticulatae;
-- This taxon was considered in the past as a synonym of Q. rugosa ;

-- "Quercus ariifolia can be confused with Q. rugosa and Q. greggii. However it can be distinguished by its whitish-lanuginous abaxial blade surface and because it generally lacks amber glandular trichomes, while Q. rugosa and Q. greggii always have abundant amber glandular trichomes on the abaxial blade surface. Additionally the leaves of Q. rugosa are usually concave abaxially, while those of Q. ariifolia are not. Quercus greggii can be distinguished by its coriaceous-rigid leaves and the yellowish-tomentose abaxial blade surface. Q. ariifolia was proposed as a synonym of Q. rugosa (Muller 1997, Nixon & Muller 1997, Valencia-A. 2004, Valencia & Flores-Franco 2006), but there are differences such as those above described, that allow us to recognize these as two distinct species." S. Valencia-A. 2017

Subspecies and