Canadian Rockies study shows that spruce trees adapt to rugged peaks and boreal flatlands in a similar way‎

If you look at the trees as you're driving on the Trans-Canada Highway toward Banff National Park, you will see Englemann spruce on the cooler, wetter northeast-facing slopes of the Three Sisters. Across the valley—on the warmer, drier, southwest-facing slopes of Grotto Mountain—are white spruce.