Trel. 1924 Mem. Natl. Acad. Sci. 20: 93
cordifolia Trel. 1924 Diagnosis here
|Range||Mexico (Chihuahua, Coahuila, Durango, San Luis Potosi, Tamaulipas, Zacatecas) ; 1500-3000 m ;|
|Growth habit||15-50 cm, no more than 1 m;|
|Leaves||1-3 x 0.5-1.3 cm; subcoriaceous; close together on the twig; elliptic or oval ; apex rounded or mucronate; base rounded or obtuse, sometimes cordate; margin flat, entire or lobed-dentate with 1-2 pairs of mucronate teeth, mostly asymmetrically; adaxially dull greyish green, glabrescent, with scattered trichomes, denser on the veins of the base of the blade (solitary simple and 7-14 rayed sessile fascicled trichomes); abaxially paler, densely tomentose with solitary simple, fascicled, simple glandular and bulbous glandular trichomes; 6-8 vein pairs, more or less impressed above, raised under; epidermis papillose; petiole 1-3 mm, tomentose at first, then glabrescent;|
|Fruits||acorn 0.8-1.2 cm, ovoid, slightly striated, singled or paired, sessile or on a peduncle to 15 mm long; enclosed 1/2 by cup; cup half-round, with straight margin, 8-12 mm in diameter, thin scales pubescent at base and hairless at apex; maturing the first year in August to September;|
Bark, twigs and
|bark grey, furrowed; twig 2-5 mm in diameter, greyish tomentose at first then glabrescent, with inconspicuous lenticels; bud subglobose 0.5-2 mm long; stipules glabrescent 1.5-3 mm.|
|Hardiness zone, habitat||hardy zone 7-8|
|Miscellaneous||-- Sub-genus Quercus, Section Quercus,
Series Leucomexicanae, Group Microphyllae;
-- For Susana Valencia 2006, Govaerts 2007 and The Plant List 2013, Q. cordifolia is a synonym ; for other Authors (José A. Villareal & al. 2008, J.L. Sabàs Rosales 2016), Q. cordifolia AND Q. microphylla are synonyms of Q. striatula.
-- Actually Q. striatula is different from Q. microphylla which has larger, more coriaceous leaves with a revolute margin.