Sub-Alpine Fir(Abies lasiocarpa) is easily Identified by its extremely narrow, spire like crown. They also have a very crisp, pungent smell. It is a general rule that the higher in elevation a tree grows, the narrower its crown. An obvious adaption to the higher snowfall at high elevation. And as its name implies, these trees only grow up high, usually above 7,500ft, to tree line(11,000ft).