Soon they were in the aspens; green-yellow leaves whispering in the almost unfelt breeze.
In the deeper valleys and on the lowlands of West Siberia the larches, pines and silver firs, intermingled with birches and aspens, attain a great size, and the streams are fringed with thickets of poplar and willow.
The sandy lands were in part burnt over by Indians, and there was a growth of scrub oak, aspens and huckleberry bushes.
Thickets of alders and willows in wet places and new-made land, aspens and large cottonwoods west of the characteristic spruce area (as on Seward Peninsula), are also common.
This rise and fall of Walden at long intervals serves this use at least; the water standing at this great height for a year or more, though it makes it difficult to walk round it, kills the shrubs and trees which have sprung up about its edge since the last rise--pitch pines, birches, alders, aspens, and others--and, falling again, leaves an unobstructed shore; for, unlike many ponds and all waters which are subject to a daily tide, its shore is cleanest when the water is lowest.
Already, by the first of September, I had seen two or three small maples turned scarlet across the pond, beneath where the white stems of three aspens diverged, at the point of a promontory, next the water.