Quercus tardifolia C.H.Mull.

Mexico (Coahuila) ; Texas (Chisos Mountains) ; 2000 m ; very restricted area;

small, erect tree; short, thick branches;

5-10 x 2-7 cm; evergreen; oboval; flat; apex pointed; base rounded or cordate; margin with 3-4 shallow aristate lobes; dull green, hairless, rough above; densely tomentose beneath, especially on the prominent veins; petiole 1-2 cm long, sometimes pubescent;

acorn subsessile, paired, maturing in 2 years; cup scales appressed, glabrescent;

– A.Camus : n° 429; – Sub-genus Quercus, section Lobatae; – Very rare; – May be a hybrid between Q.gravesii and Q.hypoxantha ;