Why does this subalpine fir have no branches on one side? Is it because of rockslides and avalanches? Or wind? Or plant hormones? It appears to me that biologists have not yet come up with a conclusive answer.
What is a tree that lives only in the coldest and harshest ecosystems at timberline in the northern Cascades?
What are those "mousetails" sticking out from Douglas-fir cones? They are called "bracts." Learn about bracts here.