Alnus rubra
The dominant species in the rainforest are Sitka spruce ("Picea sitchensis") and western hemlock ("Tsuga heterophylla"); some grow to tremendous size, reaching in height and in diameter. Coast Douglas-fir ("Pseudotsuga menziesii" var. "menziesii"), western red cedar ("Thuja plicata"), bigleaf maple ("Acer macrophyllum"), red alder ("Alnus rubra"), vine maple ("Acer circinatum"), and black cottonwood ("Populus trichocarpa") are also found throughout the forest.