Kevin C. Nixon

Quercus buckleyi, commonly known as Texas red oak, Buckley's oak, or Spanish oak is a species of flowering plant. It is endemic to the southern Great Plains of the United States (Oklahoma and Texas). Buckley's oak is smaller and more likely to be multitrunked than its close relative, the Shumard oak (Q. shumardii). The two species are interfertile, and hybrids are common along a line from Dallas to San Antonio, Texas. Texas red oak usually is 30 to 50 feet (9.1 to 15.2 meters) tall at maturity, and seldom reaches a height of more than 75 feet (23 meters). Quercus buckleyi was formerly known

Quercus john-tuckeri is a North American species of oak known by the common name Tucker oak, or Tucker's oak. It is endemic to California, where it grows in the chaparral and oak woodlands of mountain slopes in the western Transverse Ranges, the southernmost Central Coast Ranges, and the margins of the Mojave Desert. The species is named after John M. Tucker, professor of botany (1947–1986) at the University of California at Davis, specialist in Quercus.

Quercus cornelius-mulleri is a North American species of oak known by the common name Muller oak, or Muller's oak. It was described to science in 1981 when it was segregated from the Quercus dumosa complex and found to warrant species status of its own. It was named after ecologist Cornelius Herman Muller. It is native to southern California and Baja California, where it grows in chaparral, oak woodlands, and other habitat in foothills and mountains. It can most easily be observed in Joshua Tree National Park and in the woodlands along the western margins of the Colorado Desert in San Diego

Quercus pacifica is a species of oak known by the common names island scrub oak, Channel Island scrub oak, and Pacific oak.

Quercus hintoniorum is a species of oak. It has only been found in the northeastern Mexican states of Coahuila and Nuevo León.

Quercus hirtifolia is a rare Mexican species of oak. It has been found only in a small region of the southern Sierra Madre Oriental in northern Puebla and eastern Hidalgo states in east-central Mexico.

Quercus miquihuanensis is a species of oak in the family Fagaceae. It is endemic to the Nuevo León and Tamaulipas states of Mexico. It is an endangered species, threatened by habitat loss. It is placed in section Lobatae.

Quercus coahuilensis is a species of plant in the family Fagaceae. It is endemic to the Mexican state of Coahuila. It is placed in section Lobatae.

Platanus gentryi, commonly known as Gentry's plane tree, Gentry's sycamore, Sicómoro de la Sierra, or the mountain sycamore, is a species of Platanus in the family Platanaceae. It was described by Kevin C. Nixon and Jackie M. Poole in 2003. The species is endemic to northwestern Mexico, primarily the states of Chihuahua, Sinaloa, and Sonora, at general elevations of 650–1,500 m, where it grows in semi-arid, dry conditions. It is currently listed as "Vulnerable" by the IUCN Red List, for the logging industry has been over-exploiting the species profitable lumber.

Platanus rzedowskii, commonly known as Rzedowski's plane tree, Rzedowski's sycamore, Sicómoro de la Sierra Madre Occidental, or the Sierra Madre Occidental sycamore, is a species of Platanus in the family Platanaceae. It was described by Jackie M. Poole in 2003 with the name attributed to Kevin C. Nixon.

Quercus delgadoana is an endangered species of oak in the family Fagaceae, found in eastern Mexico. It was originally misidentified as other members of the genus Quercus, but was determined as a new species in 2011.

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