Picea mariana
16-24 inches tall
A hearty North American native tree, found throughout Canada and the nothern most parts of the United States and its high peaks.  It is a slow-growing evergreen conifer, reaching 30-50 feet at maturity.  They tend to not have a very wide spread, growing tall and narrow, not conical. 
It is known by other names such as Bog Spruce and Swamp Spruce.  As those names suggest, they are tolerant of wetter, organic, more acidic soils.  They tend to occur in wetland areas, but are also found in dryer soils.