Oaks of the World

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  Quercus intricata
Author

Trel. 1922 Contr. U. S. Natl. Herb. 23: 185

Diagnosis here
Synonyms microphylla var. crispata A.DC. 1864
Local names intricate oak ; dwarf oak ; Coahuila scrub oak ;
Range Mexico (Chihuahua, Coahuila, Nuevo Leon, Durango, San Luís Potosí, Tamaulipas, Zacatecas)  ; Texas (Chisos Mount., Eagle Mount.) ; from 1500 to 2850 m ; restricted area;
Growth habit 0.5-2 m; evergreen; intricate branches; thicket forming;
Leaves 1-4 x 0.5-1.8 cm ; evergreen; very thick, leathery, rough, sometimes convex; elliptic, oval-elliptic or elliptic-oblong; apex variable, mucronate; base obtuse or slightly cordate; margin slightly wavy, strongly revolute, entire or with 1-3 pairs of short teeth (less than 2 mm long) asymmetrically arranged and not in same number each side; olive green above, shiny or not, with stellate and glandular hairs mainly along veins and base; densely yellowish grey or silvery tomentose beneath, becoming sometimes glabrescent second year, with a tomentum made of simple and stellate trichomes, with also uniseriate glandular ones; 7-10 veins pairs, hairless, impressed adaxially, prominent beneath; petiole 2.5-5 mm, tomentose;
Flowers spring; male catkins 2-3 cm long, with numerous flowers; female catkins 3-10 mm, with 1-5 pubescent flowers;
Fruits acorn globose, 1-1.5 cm in diameter; light brown; single or paired; cup subsessile or shortly stalked (to 1 cm long), rim straight or sometimes rolled inside, covering at least half of nut, with thickened, pubescent scales at base ; maturing in 1 year, from September to December; cotyledons distinct;

Bark, twigs and
buds

bark grey, scaly, rough; twig 1.3-2 mm thick, slender, yellowish grey tomentose, becoming dark brown; bud pubescent at first, rounded, dark brown, 1-1.5 mm long; stipules persistent, pubescent, 2 mm long;
Hardiness zone, habitat hardiness zone : 7; dry, calcareous, rocky soils;
Miscellaneous -- A. Camus : n° 255 ;
-- Sub-genus Quercus, Section Quercus, Subsection Leucomexicanae;
-- Closely related to Mexican species Q.deliquescens Née, which has leaves with longer, symmetrical teeth, in same number each side, and a different cup.
-- No hybrid known;

Subspecies and
varieties 		--- For Trelease = f. ovata Trel., f. angusta Trel., f. erratica Trel. ( Mexico) ;
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