Which of the following is a native species in Connecticut?

Black walnuts are indeed a native species in Connecticut. They are part of the Juglandaceae family and are well-adapted to the local environment. Native to North America, black walnuts thrive in the rich soils found in Connecticut, growing in a variety of forested areas. Their hardwood is known for its strength and durability, and the nuts are a valuable food source for wildlife and can be used by humans in cooking and baking.

In contrast, the other choices do not have the same native status in Connecticut. White walnuts, while present in some regions, are not commonly considered native to Connecticut. Butternut walnuts, also known as white walnuts, are facing decline due to disease and are also not as prevalent in the state. Persian walnuts are native to a different region and were introduced to North America, meaning they are not part of the native flora of Connecticut.