Salix lucida
Shining willow
 
Salix lucida can reach a height of 6 to 15 feet and a similar width. This willow naturally grows in moist soils near streams, ponds, and wetlands in the New England region. It provides critical habitat and serves as a food source for various wildlife, including the caterpillars of several butterfly species.
 
The term "shining willow" refers to the reflective quality of its leaves. By choosing Salix lucida, you're not only adding aesthetic value to your garden but also promoting biodiversity. 
 
photo credit to Charlie Hohn