| Quercus tardifolia | |
|---|---|
| Conservation status | |
 Critically Endangered (IUCN 3.1) | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fagales |
| Family: | Fagaceae |
| Genus: | Quercus |
| Subgenus: | Quercus subg. Quercus |
| Section: | Quercus sect. Lobatae |
| Species: | Q. tardifolia |
| Binomial name | |
| Quercus tardifolia C.H.Muller | |
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.
Conservation
This species was thought to be extinct, however on May 25, 2022, a remaining specimen was found.
Etymology
The common name Chisos Mountains oak refers to the Chisos Mountains range where the species was discovered, and the species name refers to the tree leafing out later than comparable species.
References
- Beckman, E. (2017). "Quercus tardifolia". IUCN Red List of Threatened Species. 2017: e.T30958A88668914. doi:10.2305/IUCN.UK.2017-2.RLTS.T30958A88668914.en. Retrieved 16 November 2021.
- Biota of North America Program 2014 county distribution map
- ^ "Quercus tardifolia in Flora of North America @ efloras.org". www.efloras.org. Retrieved 2018-08-15.
- SciTechDaily. "Clinging to Life: Scientists Rediscover Oak Tree Thought To Be Extinct." The Morton Arboretum July 7, 2022
- Morgan, Jack (2023-07-24). "Texas oak tree thought to be extinct discovered in Big Bend National Park". KUT Radio - Austin. Retrieved 2023-07-25.
External links
- Wildscreen Arkive, Chisos Mountains oak (Quercus tardifolia) — photo of herbarium specimen.
- Conabio Naturalista, Quercus tardifolia — photo of live specimen.
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- IUCN Red List critically endangered species
- Quercus
- Endemic flora of Texas
- Flora of Coahuila
- Flora of the Rio Grande valleys
- Big Bend National Park
- Plants described in 1936
- Critically endangered flora of North America
- Critically endangered biota of Mexico
- Critically endangered flora of the United States
- Quercus stubs