The grasses of North Carolina

Grasses of the United States because of its excellency and its general use, although other workers and even the author himself may not always be in full agreement with certain treatments.The species and varieties recorded in this manual are based upon specimens deposited in the Herbarium of Duke University, the National Herbarium, the Gray Herbarium, the New York Botanical Garden, the University of North Carolina, and various other herbariums.In order to conserve space, these specimens are not cited.' In completing this work it is a pleasure to acknowledge with deep appreciation the kind co-operation and assistance received from many individuals and institutions during its progress.The author is especially grateful to the late Professor A. 8. Hitchcock and to his associates, Agnes Chase and Jason R. Swallen, who, particularly in the early phases of this work, assisted him in learning how to identify grasses and stimulated his efforts by their interest and enthusiasm.In the preparation of this manuscript, the author has drawn freely from Professor Hitehcock's Manual of Grasses of the United States.To Mr. Swallen and Ruth M. Addoms he owes special thanks for reading the manuscript and contributing constructive eriticism.He also wishes to acknowledge constant thoughtful and sympathetie cooperation from bis professional associates and former students at Duke