Quercus chihuahuensis
{{Short description|Species of oak tree}}
{{speciesbox
| genus = Quercus
| display_parents = 2
| parent = Quercus sect. Quercus
| species = chihuahuensis
| authority = Trel.
| synonyms = * Quercus chihuahuensis f. amplifolia Trel.
- Quercus chihuahuensis f. microphylloides Trel.
- Quercus chihuahuensis f. tenuis Trel.
- Quercus infralutea Trel.
- Quercus jaliscensis Trel.
- Quercus santaclarensis C. H. Muller
| synonyms_ref = {{ThePlantList |id=kew-172132 |taxon=Quercus chihuahuensis |authority=Trel.}}
| image = Chihuahuensis.jpg
| status = LC
| status_system = IUCN3.1
}}
Quercus chihuahuensis, the Chihuahua oak, is a species of oak in the beech family.Trelease, Memoirs of the National Academy of Science vol 20. 1924. It is native to the region from extreme western Texas west to Sonora, Mexico, and south to Zacatecas and San Luis Potosí. It grows mostly at mid elevations, from {{Convert|400–2000|m|abbr=off}} above sea level, in forests mixed with various pines and other oaks. It is one of the dominant species of the Sierra Madre Occidental in Chihuahua and Sonora.Stanley, P.C. 1922. Trees and Shrubs of Mexico. Contributions from the United States National Herbarium 23(2).CONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Capital Nat. México. CONABIO, Mexico City.[http://swbiodiversity.org/seinet/taxa/index.php?taxon=28180&taxauthid=1 SEINet, Southwestern Biodiversity, Arizona chapter]
The tree grows up to 10 m (33 ft) tall, very common in much of its range. The leaves are entire to toothed or sublobate, green on the top but yellow or gray on the underside because of a coating of velvety, stellate (star-shaped, highly branched) hairs. The species is related to Quercus arizonica and Quercus grisea, sometimes hybridizing with these two species in Texas.{{eFloras|1|233501017|Quercus chihuahuensis |family=Fagaceae |first=Kevin C. |last=Nixon}}Nixon, K. C. 1993b. The genus Quercus in Mexico. In: T. P. Ramamoorthy et al., eds. 1993. Biological Diversity of Mexico: Origin and Distribution. New York. Pp. 447-458.