|Author||Trel. 1924 Mem. Natl. Acad.
Sci. 20:135 1924
|Range||Mexico (E. Sinaloa, SW Durango); 1730-2500 m|
|Growth habit||5-8 m, trunk 15-45 cm in diameter|
|Leaves||15-30 cm x 8-30, suborbicular; apex obtuse-round bristle-tipped; base cordate; margin entire or irregularly toothed, with 1-14 aristae, mostly in the apical part of the blade; adaxially glabrous or with some scattered uniseriate hairs and tomentose on veins and axils; abaxially densely pale grey-brown tomentose, hiding the papillose, somewhat bullate epidermis; 7-10 veins pairs; petiole 1.5-3 cm long, tomentose;|
|Flowers||pistillate catkins tomentose, 4-17 cm long, bearing 8-20 acorns clustered at the end;|
|Fruits||acorn circa 1 cm long, 0.7-1 cm wide, ovoid, 1/3 enclosed in a 0.8-1 cm wide cup;|
Bark, twigs and
|bark of first year twig greyish-yellow tomentose, older twig hairles and grey to black-purple; bud 3-9 mmn ovoid, villose;|
|Hardiness zone, habitat||mineralized, sterile soils in oak-pine forests;|
|Miscellaneous||-- Sub-genus Quercus,
Section Lobatae, Series Erythromexicanae, Group Racemiflorare (with Q.
urbanii, Q. conzatii, Q. tarahumara, Q. radiata and Q. huicholensis);
-- This taxon has been synonymous with Q. urbanii until the work of R.A. McCauley 2020
-- No hybrids known with other oak species