Oaks of the World

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  Quercus hypoleucoides
Author A.Camus 1932
Synonyms confertifolia Torr.1858
hypoleuca Engelm. 1876, nom. illeg.
Local names whiteleaf oak ; silverleaf oak ;
Range Mexico (Chihuahua, Coahuila, Durango); South-East Arizona; New-Mexico ("Copper Mines"); Texas; 1100-2700 m;
Growth habit may reach 10-20 m; but more often shrubby, 2 to 5 m; branches slender, ascendant;
Leaves

5-10 x 1.5-3 cm; evergreen; lanceolate; leathery; apex pointed, aristate; base rounded or cuneate; margin thick, rolled under, entire or , sometimes with 1-3 pairs of aristate teeth; more or less dark green above, with simple and stalkless stellate hairs scattered, glabrescent; densely whitish or yellowish tomentose beneath with stalkless, stellate hairs and golden glandular ones, all tangled; midrib prominent below; 9-12 veins pairs slightly impressed adaxially, prominent beneath; epidermis bullate and papillose; petiole glabrescent 3-11 mm long;

Flowers in February-March; male catkins 3-6 cm long, hairy, with numerous flowers; female ones 10 cm long, with only 1 or 2 pubescent flowers;
Fruits acorn 1-1.2 cm long; singly or paired; short peduncle 2-5 mm; cup enclosing 1/3 of nut, scaly, tomentose inside and outside; cup scales flat ; maturing in 1 or 2 years;

Bark, twigs and
buds

bark black, at first smooth, then ridged and deeply sulcate; young twigs dark red brown, densely tomentose, 1.5-3 mm in diameter; bud brown, ovoid, mostly glabrous, 2-3 mm long;
Hardiness zone, habitat not quite hardy (zone 7-8); wet mixed forests; prefers wet canyons; all types of soils;
Miscellaneous -- A. Camus : n° 300;
-- section Lobatae;
-- rare;
-- hybrids with
Q.gravesii ( = Q.x inconstans Palmer) and with Q.shumardii;
Subspecies and
varieties
 
Pictures

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