Stems are green, thin and generally pendulous. They are often in groups like this sort of like a weeping willow or a cutleaf weeping birch.
Bark is dark brown and fissured like alligator skin.
Misidentification: Be sure you are looking at the foliage and see they are simple leaves and not compound, many people look too quickly at this one and think the leaves are pinnately compound and then they are lost.
Locations: Very common