Oaks of the World

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  Quercus x heterophylla
Author F.Michx. 1812 (pro sp.) Hist. Arbr. Forest. 2: 87
Synonyms phellos x rubra
= aquatica var. heterophylla (F.Michx.)
A.DC 1864, nom. illeg.
= x hollickii C.K.Schneid. 1904
Local names Bartram's hybrid oak;
Range East United States; native where parents are meeting; introduced in Europe in 1750;
Growth habit 16-20 m, and more;
Leaves 5-8 cm long; lanceolate, oblong, or elliptic; with 1 to 4 small bristle-tipped teeth on each side at the end of shallow lobes; lustrous dark green above, paler beneath with beige pubescence at axils; leaves shape is variable, even on the same tree; petiole 1.2-2.5 cm long;
Fruits acorn nearly stalkless, similar to Q. rubra.

Bark, twigs and

twigs glabrous; buds small, pointed, glabrous;
Hardiness zone, habitat hardy; requires lime-free soils; vigourous;
Subspecies and