Is a Blackjack Tree an Oak?

A blackjack tree (Quercus nigra) is not an oak. The two trees are in the same genus, but the blackjack tree is in the family Fagaceae, while oaks are in the family Ulmaceae.

There are many similarities between blackjack trees and oaks, but there are also some significant differences. For example, blackjack trees have a different leaf shape and their bark is rough rather than smooth.

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