Quercus rysophylla Weath. 1910 Proc. Amer. Acad. Arts 45: 423

Mexico (Nuevo Leon, Tamaulipas, San Luis Potosi, Hidalgo, Queretaro, Veracruz); 400-2000 m;

tall tree reaching 25 m;

8-18 cm x 3-7; thick, leathery, very rough; elliptic to lanceolate, seldom oboval; apex acute, bristle-tipped, often shortly acuminate; base subcordate; margin slightly révolute, cartilaginous, flat or crispate, entire or with 2-4 pairs of bristle-tipped teeth in the apical half, sometimes on one side only; dark green above, lustrous, hairless except some stellate and glandular trichomes on veins; paler, hairless beneath, except some axillary tufts and some scattered stipitate fascicled hairs along midrib; 10-17 pairs of secondary veins raised beneath, impressed above; tertiary veins conspicuous on both sides, essentially beneath; epidermis papillose; petiole 2-6 mm long, glabrescent;

female catkins 1 cm long with 1-4 pubescent flowers, or more;

acorn ovoid, pointed, 1.5-2 cm long; singly or paired, or more on a stout, short peduncle 2 mm long; cup enclosing 1/3 to 1/2 of the nut; maturing in 2 years in September-October;

hardy (withstands - 17°C); fast growing; prefers lime-free soils and full sun;

– A. Camus : n° 318; – Sub-genus Quercus, section Lobatae, Series Erythromexicanae, Group Rysophyllae; – Also written “ rhysophylla “;