The eastern cottonwood or necklace poplar, is a species of cottonwood poplar native to North America.
It is a large tree growing to 20–30 m (65–100 ft) tall and with a trunk up to 2.8 m (9 ft 2 in) diameter, one of the largest North American hardwood trees. The bark is silvery-white, smooth or lightly fissured when young, becoming dark gray and deeply fissured on old trees.
It needs bare soil and full sun for successful germination and establishment; in natural conditions, it usually grows near rivers, with mud banks left after floods providing ideal conditions for seedling germination.
The leaves serve as food for caterpillars of various Lepidoptera.
It is utilized for things like plywood and interior parts of furniture.