Quercus x heterophylla is a tree, 16 to 20 m tall or more. It is in the red oak group,
Leaves stalk 1.2-2.5 cm long; blade 5-8 cm long; lance-shaped, oblong, or elliptical; with 1 to 4 bristle-tipped, shallow lobes; dark green above, paler below, hairy at axils; leaves shape is variable, even on the same tree;
Flowers monoecious, small, males in catkins, females 1-few together.
Fruit acorns. Similar to those of Q. rubra but cap covers more of nut.
Wetland status: NL.
Frequency in NYC: Rare.
Habitat: Mixed oak forests, acid soils.