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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]
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 vaseyana (also called Vasey oak) is a species of tree in the beech family. It grows in northern Mexico (Chihuahua, Coahuila, and Nuevo León) and in the US state of Texas. [4] [5] Q. vaseyana is a shrub or small tree up to 10 metres (33 feet) tall. The bark is brown.
Quercus chihuahuensis, the Chihuahua oak, is a species of oak in the beech family. [3] 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 (1,300–6,600 feet) above sea level, in forests mixed with various pines and ...
Quercus tardifolia, the Chisos Mountains oak or lateleaf oak, is a rare North American species of oak. It has been found in the Chisos Mountains inside Big Bend National Park in Texas, and in the nearby Sierra del Carmen across the Río Grande in northern Coahuila. [2] [3] Quercus tardifolia is an evergreen tree with gray bark and