Common trees showing krumholtz formation include European spruce, mountain pine, balsam fir, red spruce, black spruce, subalpine fir, subalpine larch, Engelmann spruce, whitebark pine, limber pine, Bristlecone pine, and lodgepole pine. Instances of the krummholz form of black spruce, Picea mariana, are found in the northern Canadian boreal forests. Krummholz-form black spruce and balsam fir are abundant in the alpine transition zone of the White Mountains of Maine and New Hampshire and of the same zone in the Green Mountains of Vermont.