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The genus Quercus contains about 500 known species, plus about 180 hybrids between them. [1] The genus, as is the case with many large genera , is divided into subgenera and sections . Traditionally, the genus Quercus was divided into the two subgenera Cyclobalanopsis , the ring-cupped oaks, and Quercus , which included all the other sections.
The following is a list of widely known trees and shrubs found in Texas. [ 3 ] [ 4 ] [ 5 ] Taxonomic families for the following trees and shrubs are listed in alphabetical order by family . [ 6 ]
Quercus buckleyi, commonly known as Texas red oak, Buckley's oak, or Spanish oak [4] [5] is a species of flowering plant. [6] [7] It is endemic to the southern Great Plains of the United States (Oklahoma and Texas). [8] Buckley's oak is smaller and more likely to be multitrunked than its close relative, the Shumard oak (Q. shumardii).
Quercus sect. Quercus has been known, either in whole or part, by a variety of names in the past, including Quercus sect. Albae, Quercus sect. Macrocarpae and Quercus sect. Mesobalanus. Members of the section may be called white oaks. The section includes all white oaks from North America (treated by Trelease as subgenus Leucobalanus). [2]
Quercus arizonica, the Arizona white oak, is a North American tree species in the beech family. It is found in Arizona , New Mexico , western Texas , Sonora , Chihuahua , Coahuila , Sinaloa , and Durango .
The Mexican blue oak is common at elevations of 1,200 to 1,800 m (4,000–6,000 ft).It is often found on thin sandy soils in semi-arid regions and is the dominant species in lower open oak woodland where it grows in association with Arizona white oak (Quercus arizonica) and Emory oak (Quercus emoryi). [7]
Quercus michauxii, the swamp chestnut oak, is a species of oak in the white oak section Quercus section Quercus in the beech family. It is native to bottomlands and wetlands in the southeastern and midwestern United States, in coastal states from New Jersey to Texas, inland primarily in the Mississippi–Ohio Valley as far as Oklahoma, Missouri, Illinois, and Indiana.
Quercus carmenensis, the Mexican oak, [1] is a tree species native to Brewster County, Texas, and Coahuila, Mexico. It grows in pine-oak forests at elevations of 1,500–1,950 metres (4,920–6,400 feet). It is a deciduous species with gray bark and red twigs.