Quercus ×ludoviciana is a naturally occurring oak hybrid from southeastern United States, which has flourished and attracted attention in collections worldwide. Over the years there has been some confusion regarding the hybrid’s parentage, but it is currently accepted to be a cross of Q. phellos (willow oak) and Q. pagoda (cherrybark oak).

Originally described as a species, Quercus ×dysophylla is now considered to be of hybrid origin.

Quercus ×morehus was initially called Abram’s oak by the author Albert Kellogg in his original 1863 description and was thought to be a unique species at the time (although his description was based on a single specimen). Current taxonomy designates this as a hybrid of Q. kelloggii × wislizeni and is now known as the Oracle oak thanks to Willis Linn Jepson’s book The Silva of California, written in 1910.