Necklace poplar, also known as cottonwood or balsam poplar, is a tree species that can grow up to 100 feet tall and is native to North America. The name "necklace poplar" comes from the fact that its branches often break off and hang like necklaces. Other synonyms for this tree include black cottonwood, western balsam poplar, and Fremont's cottonwood. Its bark is gray-green with deep furrows, and its leaves are heart-shaped and green. Necklace poplar is often used for shade and erosion control in wetland areas, as it has a shallow root system and can tolerate flooding. It is also used in making furniture, paper products, and musical instruments.