| a spruce, Picea pungens, of western North America, having bluish-green leaves, grown as an ornamental: the state tree of Colorado and Utah. |
| blue spruce n. A Rocky Mountain tree (Picea pungens) having silvery-blue or blue-green, four-angled, needlelike leaves and cylindrical cones. It is extensively cultivated as an ornamental. Also called Colorado blue spruce. |
| Colorado blue spruce n. See blue spruce. |
