swamp cottonwood Salicaceae Populus heterophylla L.   symbol: POHE4
	Leaf: Alternate, simple, broadly ovate, serrated margin, heart-shaped base, 4 to 7 inches long, petiole round, green above and paler below. Flower: Dioecious; males occur in 1 inch long catkins, females occur in a sparse flowered catkin, appearing before leaves. Fruit: Half inch capsules in hanging catkins, appearing in spring. Twig: Stout, reddish or greenish brown, lighter lenticels, large leaf scar, orange-brown pith; buds are 1/3 inch long, reddish brown, broad and pointed, slightly gummy. Twig has a bitter aspirin taste. Bark: Gray-brown, strongly vertically ridged. Form: Medium to large tree that can reach heights over 80 feet, straight trunk and clear bole.
	USDAFS Silvics of North America - USDA Plants Database Populus heterophylla is native to North America. Range may be expanded by planting. See states reporting swamp cottonwood (opens a new window).