Blue spruce
（重定向自Colorado Spruce）
The blue spruce, green spruce, white spruce, Colorado spruce, or Colorado blue spruce, with the scientific name Picea pungens, is a species of spruce tree. It is native to the Rocky Mountains of the United States. Its natural range extends from Colorado to Wyoming but it has been widely introduced elsewhere and is used as an ornamental tree in many places far beyond its native range.