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Insider Tour – Oaks

There are approximately 600 extant oak species, of which 160 are native to Mexico (109 endemic), 90 to the US, 40 to Texas and 100 to China. Because of its diversity, Mexico was considered, until recently, by many scientists to be the center of worldwide distribution of oaks; however, based on a large sample of herbarium specimens and fossils, using both physical and genetic observations, the current thinking is that oaks originated at the higher altitudes of northern Canada and migrated first to the western and eastern US and Europe, then, later, from the US to Mexico and from Europe to Asia. In Mexico, the oaks commenced rapid speciation (which is ongoing today) due to the large number of geographic zones separated by dramatic temperature or moisture gradients.

Quercus laeta –
Quercus mexicana –
Casimiroa pringlei – Not an oak. Rutaceae.
Quercus rysophylla – Native to the mid to lower elevations of northeastern Mexico. Stiff rough ovate to lanceolate dark green leaves. To 80 feet. Evergreen to semi-deciduous in our area, Sometimes marcescent. Cold and drought tolerant. Steeply draining soil is recommended. Better in full sun.
Quercus emoryi – One of only two oaks theorized to have returned north from Mexico to the US. Native to dry foothills and canyons of west Texas to Arizona and Mexico. Often growing with Q. oblongifolia. Black furrowed bark, glossy green leaves. Red acorn with a yellow cap. 30 to 60 feet. Evergeen. Rounded crown. Requires extremely well-drained soil. Requires full sun.
Quercus polymorpha – Variable leaves (hence the name), usually simple, elliptic to obtuse. Shaggy brown bark, more furrowed with age. Native to Val Verde, Texas (where surveyors of the Texas Nature Conservancy found it growing on their property) to Mexico and Guatemala. Mostly evergreen. Cold hardy. Drought tolerant. Steep drainage. Sun to part shade.
Quercus sartorii (xalapensis) – Native to northeatern Mexico.
Quercus aff. opaca – Native to northeastern Mexico. Closely related to pringlei.
Castanopsis cuspidata – Native to Japan and souther Korea. Home to the shiitake mushroom which means castanopsis mushroom.
Quercus crassifolia – Leathery leaf. New growth adaxially bright red, abaxially white. Mature leaf is olive green adaxially, orange abaxially.
Quercus sp. dwarf – Collected in northeastern Mexico. The parent plants were nothing more than small shrubs. These are much larger, possibly due to animal grazing in their habitat.
Quercus tarahumara – Native to the Sierra Madre. Very large leaves.
Quercus fusiformis –
Quercus vaseyana complex –
Quercus intricata – Reproduces vegetatively forming large colonies on open chaparral scrubland. Native to Texas – only two places, critically endangered here – and Mexico where it is abundant.
Quercus phillyraeoides – Nice evergreen oak. To about 60 ft. but often used as a large shrub. Multitrunked.
Quercus glauca –
Quercus dentata – Lanky reaching habit.
Quercus polymorpha (Val Verde) –
Quercus laeta –
Quercus aliena – To 80 ft. Native to Japan, Korea and central China.
Quercus sartorii –
Lithocarpus edulis (green) –
Quercus glauca –
Quercus sinuata – Native to this area of Texas.
Quercus texana –
Quercus alba –
Lithocarpus edulis (variegated) –
Quercus rhysophylla –
Quercus acutissima –
Quercus michauxii – Tolerates flooding. Beautiful large leaf.
Castanopsis sclerophylla – Probably one of the most beautiful of the oak flowers.
Quercus x warei – A cross between Quercus rober ‘Fastigiata’ and Quercus bicolor. Patented.
Quercus crassipes – Another Mexican oak, Hidalgo south to Chiapas. To 60 ft.
Quercus muehlenbergii –
Quercus alba –
Quercus schottkyana –
Quercus coccinea – Bright red fall foliage.
Quercus crassifolia –
Quercus glauca –
Quercus crassipes –
Quercus oblongifolia – Native to upper grasslands of southwest and Mexico.
Quercus greggii – Native to northeastern Mexico. To about 30 ft. but can be a shrub at high elevations.
Quercus dentata ‘Carl Ferris Miller’ – A full crown as opposed to dentata.
Quercus corrugata – Northeastern Mexico to Central America. Very large tree to 150 ft. Chocolate new growth.
Quercus lyrata –
Quercus acutissima – Note bright foliage.
Quercus marylandica –
Quercus falcata –
Quercus insignis – Large acorn. Wine-colored new growth. Native to Veracruz, Mexico.
Quercus afares – Algeria/Tunisia. Grows with q. suber. Bark is corky.
Quercus canariensis – Southern Spain to Morrocco/Tunisia. To 90 ft. Deciduous based on winter temperature.
Quercus buckleyi –
Quercus gravesii – Chisos Red Oak. Texas and Mexico at higher elevations. To 45 ft. Showy fall color red and gold south of Dallas.
Quercus affinis – Northeastern Mexico.