Excerpt from Annotated List of the Plants Growing Naturally at the National Arboretum An understanding of why plants native to the eastern United States are now either abundant, rare, or absent at the National Arboretum depends on a knowledge of the soils, moisture, drainage, and general land usage previous to and after purchase of the Arboretum tract by the Federal Government in 1927. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.