Blackjack oak and black oak are two very different trees. Blackjack oak is a small, deciduous tree that grows in the eastern United States.
Black oak is a large, deciduous tree that grows in the western United States. Both trees have dark bark, but that is where the similarities end.
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Blackjack oak has small, oval-shaped leaves that are dark green in color. The leaves turn red in the fall. The tree produces small, round acorns that are black in color. Black oak has large, oval-shaped leaves that are light green in color.
The leaves turn red, brown, and yellow in the fall. The tree produces large, oval acorns that are dark brown in color.
Blackjack oak grows in dry, sandy soils. It is often found in open fields and on hillsides.
Black oak grows in moist, rich soils. It is often found in woods and along streams.
So, while blackjack oak and black oak are both dark-barked trees, they are not the same species.