Compare sources for Quercus × × rudkinii

Eastern USA to Texas

very variable, even on the same twig; apex obtuse; base rounded or weakly cordate; margin entire or with obtuse lobes; young leaves pubescent, often rusty coloured beneath; petiole very short;

hardy;

Resources:
http://oaks.of.the.world.free.fr/quercus_rudkinii.htm
Rudkin’s oak (Hybrid Quercus × rudkinii)

– Section Lobatae; – Discovered in 1881; – Fixed hybrid, comes true from seeds.