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.Biota of North America Program 2014 county distribution map
Quercus tardifolia is an evergreen tree with gray bark and reddish-brown twigs. The leaves are flat, up to 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.SciTechDaily. "Clinging to Life: Scientists Rediscover Oak Tree Thought To Be Extinct." The Morton Arboretum July 7, 2022
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
External links Wildscreen Arkive, Chisos Mountains oak (Quercus tardifolia) — photo of herbarium specimen. Conabio Naturalista, Quercus tardifolia — photo of live specimen.