A common poplar of eastern and central United States; cultivated in United States for its rapid growth and luxuriant foliage and in Europe for timber WordNet 3.0 & Open English WordNet

Populus deltoides, the eastern cottonwood or necklace poplar, is a species of cottonwood poplar native to North America, growing throughout the eastern, central, and southwestern United States as well as the southern Canadian prairies, the southernmost part of eastern Canada, and northeastern Mexico. Wikipedia