Got this stuff lookin like its a member of the birch family. Its not exactly a tree because its a bunch of branches not much more than an inch or two in diameter. The bark that is on the larger parts turns a grey silver.
Try this... I went as far as I could but there were answers that weren't readily available from your pictures and description. What Tree Is That? Tree Identification Guide at arborday.org
Catkins like those little buds in alternating parts of the branches. It does look alder of some kind. Makes me just wonder since this is more shrubbery than tree.