Populus deltoides is a species of cottonwood tree native to North America, known for its tall height and attractive foliage. This species is commonly referred to by several synonyms, including Eastern cottonwood, necklace poplar, and plains cottonwood. These synonyms are often used interchangeably to refer to the same species of tree, depending on the region and context. Eastern cottonwood is the most commonly used synonym, as the species is primarily found in the eastern and central regions of the United States. Necklace poplar and plains cottonwood are less commonly used, but still accurate and descriptive synonyms for Populus deltoides.