- 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 蓝云杉：一种落基山树木（锐尖北美云杉 云杉属） ，有银蓝或蓝绿色、四角形、呈针状的叶子和圆柱型球果。作为观赏植物被广泛种植 也作 Colorado blue spruce