Oaks of the World

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  Quercus striatula
Author

Trel. 1924 Mem. Natl. Acad. Sci. 20: 93

Diagnosis here
Synonyms

striatula var. otinapensis Trel. 1924
Local names
Range Mexico in the Sierra Madre Occidental (Aguascalientes, Chihuahua, Durango, Guanajuato, Zacatecas) ; 1500-3000 m ;
Growth habit 0.3-1.2 m;
Leaves 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;
Flowers
Fruits 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;

Bark, twigs and
buds

bark grey, furrowed, sometimes in thin irregular plates; twig 0.7-1.5 mm in diameter, greyish tomentose at first then glabrescent, with inconspicuous lenticels; bud subglobose 1-2 mm long; stipules glabrescent 1.5-3 mm.
Hardiness zone, habitat hardy zone 7-8
Miscellaneous

-- 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.
Subspecies and
varieties
Pictures

 

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