Cornelius Herman Muller

Quercus hinckleyi, commonly called Hinckley oak, is a rare species in the white oak group (Quercus Section Quercus). It has a restricted range in the Chihuahuan Desert of the southwestern United States and northern Mexico (Chihuahua and Coahuila). In the US, it occurs in only two counties in southwestern Texas and is federally listed as a threatened species.

Quercus cedrosensis, the Cedros Island oak, is a species of plant in the family Fagaceae. It is placed in Quercus section Protobalanus. Quercus cedrosensis is native to Baja California state in northwestern Mexico, including Cedros Island. It has also been found in San Diego County, California. Quercus cedrosensis is vulnerable to habitat loss due to overgrazing by goats and overlogging.

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. Quercus tardifolia is an evergreen tree with gray bark and reddish-brown twigs. The leaves are flat, up to 10 centimetres (4 inches) long, green on the upper surface and with woolly hairs on the underside, with a few shallow lobes.

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 copeyensis is a species of oak endemic to the Talamancan montane forests of Costa Rica and Panama. It is commonly called Panamanian oak. Quercus copeyensis is a large deciduous tree up to 35 metres (115 feet) tall with a trunk frequently more than 100 centimetres (39 inches) in diameter. The leaves are often clustered at the ends of branches, with blades up to 15 centimetres (6 inches) long. It is often found with Quercus costaricensis in upper montane forests, up to 3,100 m (10,200 ft) in elevation.

Quercus ajoensis is an uncommon North American shrub with the common name Ajo Mountain shrub oak. It has been found in Arizona mountain ranges of the Colorado desert, and Arizona uplands of the Sonoran Desert. Q. ajoensis integrates with Q. turbinella and is difficult to determine specimen identification due to hybridization. It appears that this species is an elevation variant of Q. turbinella and is best treated as a subspecies or variety as it has been treated in the past. The status of Q. ajoensis as a species is probably unnecessary due to complete integration with Q. turbinella or it

Quercus robusta, also called robust oak, is a rare North American species of oak. It has been found only in the Chisos Mountains inside Big Bend National Park in western Texas. Quercus robusta is a deciduous tree growing up to 13 metres (43 feet) tall. The bark is black or brown, the twigs dark reddish brown. The leaves are up to 12 centimetres (4+3⁄4 inches) long, with a few teeth or small lobes along the edges. The tree grows in moist, wooded canyons.

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 carmenensis, the Mexican oak, 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. The leaves are lanceolate with irregular lobing along the margins.

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 martinezii is a species of oak found in southwestern and central Mexico. It has been found in Nayarit, Jalisco, Michoacán, Guerrero, and Oaxaca states. It is placed in Quercus section Quercus.

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.

Quercus pinnativenulosa is a species of oak endemic to Mexico.

Quercus panamandinaea is a species of oak tree native to Costa Rica and Panama. It belongs to Quercus sect. Lobatae within Quercus subg. Quercus and is named after its distribution in Panama and the Andean region. It prefers a wet, tropical biome.

Quercus canbyi (Canby oak, Sierra oak), synonyms including Quercus graciliformis, is a North American species of oak tree.

Quercus galeanensis is a species of oak tree in the family Fagaceae, native to Northeastern Mexico. The tree is endemic to Mexico, restricted to two subpopulations occupying a narrow band (150 x 10–20 km) from Galeana in Nuevo León state, to the Miquihuana region in Tamaulipas state. It is an IUCN Red List endangered species, threatened by habitat loss. It is placed in section Lobatae.

Quercus deliquescens is a species of oak tree in the family Fagaceae, native to northeast Mexico. It is placed in section Quercus.

Quercus × basaseachicensis is a species of oak tree in the Fagaceae (beech) family. It is thought to be a hybrid of Quercus depressipes and Quercus rugosa. It is native to the states of Chihuahua and Durango in Mexico, in which there are five known populations (all of which are believed to be small). Both parents are placed in section Quercus.

Quercus verde is a species of oak endemic to northeastern Mexico.

Quercus tinkhamii is a species of oak endemic to the Sierra Madre Oriental of eastern Mexico.

Quercus runcinatifolia is a species of oak endemic to northeastern Mexico.

Quercus ignaciensis is a tree in the genus Quercus. It is found only in an isolated area of the Mexican state of Sonora. It grows only in a subtropical biome. It usually grows over three metres (9.8 ft) in height. Quercus ignaciensis was described in 1942.

Quercus gulielmi-treleasei is a species of plant in the family Fagaceae. It is found in Costa Rica and Panama. It is placed in section Lobatae.

Quercus flocculenta is an endangered species of oak in the family Fagaceae, native to northeastern Mexico. It is endemic to the Sierra Madre Oriental of Nuevo León state.

Quercus edwardsiae is a species of oak endemic to northeastern Mexico.

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Quercus confertifolia, synonym Quercus gentryi, is a species of flowering plant in the family Fagaceae, native to northern and southwestern Mexico.

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