The oaks, so far as my observation has reached, seem to be most abundant and to grow largest on the islands of the San Juan and Whidbey Archipelago. One of the three species of maples that I have seen is only a bush that makes tangles on the banks of the rivers. Of the other two one is a small tree, crooked and moss-grown, holding out its leaves to catch the light that filters down through the close-set spires of the great spruces. It grows almost everywhere throughout the entire extent of the forest until the higher slopes of the mountains are reached, and produces a very picturesque and delightful effect; relieving the bareness of the great shafts of the evergreens, without being close enough in its growth to hide them wholly, or to cover the bright mossy carpet that is spread beneath all the dense parts of the woods.
The other species is also very picturesque and at the same time very large, the largest tree of its kind that I have ever seen anywhere. Not even in the great maple woods of Canada have I seen trees either as large or with so much striking, picturesque character. It is widely distributed throughout western Washington, but is never found scattered among the conifers in the dense woods. It keeps together mostly in magnificent groves by itself on the damp levels along the banks of streams or lakes where the ground is subject to overflow. In such situations it attains a height of seventy-five to a hundred feet and a diameter of four to eight feet. The trunk sends out large limbs toward its neighbors, laden with long drooping mosses beneath and rows of ferns on their upper surfaces, thus making a grand series of richly ornamented interlacing arches, with the leaves laid thick overhead, rendering the underwood spaces delightfully cool and open. Never have I seen a finer forest ceiling or a more picturesque one, while the floor, covered with tall ferns and rubus and thrown into hillocks by the bulging roots, matches it well. The largest of these maple groves that I have yet found is on the right bank of the Snoqualmie River, about a mile above the falls. The whole country hereabouts is picturesque, and interesting in many ways, and well worthy a visit by tourists passing through the Sound region, since it is now accessible by rail from Seattle.