Quercus striatula Trel.

Mexico in the Sierra Madre Occidental (Aguascalientes, Chihuahua, Durango, Guanajuato, Zacatecas) ; 1500-3000 m ;

0.3-1.2 m;

1-2.5 x 0.5-1.4 cm; subcoriaceous; close together on the twig; elliptic-lanceolate or oblong more or less lanceolate; apex acute to rounded mucronate; base rounded or obtuse, sometimes cordate; margin slightly revolute (sometimes flat), entire or lobed-dentate with 1-3 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 stellate trichomes); abaxially paler, densely tomentose with trichomes identical as those adaxially, with also simple glandular and bulbous glandular trichomes; 3-7 vein pairs, more or less impressed above, raised under; epidermis bullate and papillose; petiole 1-2.5 mm, tomentose at first, then glabrescent;

acorn 1.1-1.5 cm, ovoid, slightly striated, singled or paired, sessile or on a peduncle to 3.5 mm long; enclosed 1/4 or 1/3 by cup; cup half-round, with straight margin, 8-12 mm in diameter, thin scales pubescent at base and hairless at the rounded apex; maturing the first year in August to September;

– Sub-genus Quercus, Section Quercus, Subsection Leucomexicanae, Group Microphyllae; – For POWO , Q. cordifolia is a synonym ; for other Authors (José A. Villareal & al. 2008), Q. cordifolia AND Q. microphylla are synonyms of Q. striatula. The differences with Q. cordifolia can be seen here . – Actually Q. striatula is different from Q. microphylla which has larger, more coriaceous leaves with a revolute margin, a lack of bulbous glandular trichomes on the abaxial side of leaves, an acorn enclosed 1/2 in the cup, and which is taller. – This taxon is a member of the Q. microphylla Complex (Valencia 2020), composed of Q. cordifolia, Q. deliquescens, Q. frutex, Q. intricata, Q. microphylla, Q. mohriana, Q. repanda and Q. striatula .