Oaks of the World

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 Quercus rysophylla
AuthorWeath. 1910
Synonymssierramadrensis C.H.Muller 1942 
Local namesLoquat leaf oak ;
Range Mexico (Nuevo Leon, Tamaulipas, San Luis Potosi, Hidalgo, Queretaro, Veracruz) ; 1400-1900 m;
Growth habittall tree reaching 25 m;
Leaves 6-22 cm sur 2-5; semi-evergreen; elliptic to oboval-lanceolate; thick, leathery, very rough; apex pointed, bristle-tipped; base subcordate; margin thickened, révolute, cartilaginous, entire or with 2-4 pairs of teeth in the apical half, sometimes on one side only; dark yellowish green above, lustrous, hairless except some stellate and glandular trichomes on veins; glaucous, hairless beneath, except some axillary tufts and some scattered glandular hairs; 13-17 pairs of secondary veins raised beneath, impressed above; tertiary veins conspicuous on both sides; epidermis papillose; short petiole (0.3-0.6 cm), glabrescent;
Flowers female catkins 1 cm long with 1-4 pubescent flowers, or more;
Fruits

acorn ovoid, pointed, 1-1.5 cm long; singly or paired, or more on a stout, short peduncle; cup enclosing 1/3 to 1/2 of the nut; maturing in 1 year in July-August.

Bark, twigs and
buds

dark grey bark, deeply furrowed; twig sulcate, glabrescent, with small light lenticels; bud 6 mm long, with pubescent, deciduous stipules;
Hardiness zone, habitathardy (withstands - 17°C); fast growing; prefers lime-free soils and full sun;
Miscellaneous-- A. Camus : n° 318;
-- Section Lobatae; sub-section Rysophyllae;
-- Also written "rhysophylla";
-- For Susana Valencia-Avalos, 2004, Q.sierramadrensis is a synonym of Q.saltillensis; but for Govaerts, 2007, it is the synonym of Q. xalapensis...
Subspecies and
varieties
 
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