An oak is a hardwood tree or shrub in the genus Quercus of the beech family. They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne in a cup. The genus is widely distributed in the Northern Hemisphere; it includes some 500 species, both deciduous and evergreen. Fossil oaks date back to the Middle Eocene. Molecular phylogeny shows that the genus is divided into Old World and New World clades, but many oak species hybridise freely, making the genus's history difficult to resolve.
Quercus hypoxantha is a species of oak. It has been found only in northeastern Mexico, in the States of Tamaulipas, Coahuila, and Nuevo León.
Quercus liebmannii is a Mexican species of trees in the beech family. It has been found only in the States of Oaxaca and Puebla.
Quercus subspathulata is a Mexican species of plant in the family Fagaceae. It is native to western Mexico, found in the States of Durango, Jalisco, Nayarit, and Sinaloa. It is placed in Quercus section Quercus.
Quercus geminata, commonly called sand live oak, is an evergreen oak tree native to the coastal regions of the subtropical southeastern United States, along the Atlantic Coast from southern Florida northward to southeastern Virginia and along the Gulf Coast westward to southern Mississippi, on seacoast dunes and on white sands in evergreen oak scrubs.
Quercus sagrana, also spelt Quercus sagraeana, the Cuban oak, is a medium-sized evergreen tree native to western Cuba in the Cuban pine forests ecoregion. It is the only oak native to the Caribbean.
Quercus chihuahuensis, the Chihuahua oak, is a species of oak in the beech family. 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 400–2,000 metres 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.
Quercus intricata, common name dwarf oak, intricate oak or Coahuila scrub oak, is a plant species native to northern Mexico and western Texas.
Quercus brantii, Brant's oak, is a species of oak native to Western Asia, namely in Iran, Iraq, Syria, and Turkey.
Quercus welshii, the wavy leaf oak, shinnery oak, or Tucker oak, is a North American species of shrub in the found in the Colorado Plateau and Canyonlands region of the southwestern United States.
Quercus sinuata is a species of oak comprising two distinct varieties, Quercus sinuata var. breviloba and Quercus sinuata var. sinuata, occurring in southeast North America.
Quercus canbyi, synonyms including Quercus graciliformis, is a North American species of oak tree.
Quercus porphyrogenita is a species of oak in the family Fagaceae, native to northeastern Mexico.
Quercus viminea, the Sonoran oak, or Mexican willow oak, is a North American species of oak. It is native to northwestern and west-central Mexico, primarily in the Sierra Madre Occidental. The species range extends just north of the international border into Santa Cruz County in southern Arizona.
Quercus calophylla is a Mesoamerican species of oak tree. It is native to mountain forests of central and southern Mexico, Guatemala, and El Salvador. It has incorrectly been known as Quercus candicans.
Quercus pennivenia is a species of oak in the family Fagaceae, native to northern Mexico.
Quercus coffeicolor is a species of oak. It is native to Nayarit, Sinaloa, and Jalisco in western Mexico.
Quercus subgenus Quercus is one of the two subgenera into which the genus Quercus was divided in a 2017 classification. It contains about 190 species divided among five sections. It may be called the New World clade or the high-latitude clade; most species are native to the Americas, the others being found in Eurasia and northernmost North Africa.
Quercus manzanillana is a shrub in the genus Quercus indigenous to Mexico. It was described in 1924 by William Trelease. It is found in the Mexican state of Puebla.
Quercus rekonis is a species of oak in the subgenus Quercus indigenous to Mexico. It was described in 1924 by William Trelease. It is most commonly found in the Mexican state of Oaxaca, but can be found throughout much of western Mexico. Quercus rekonis grows in a subtropical biome.
