This volume of the Annals of the Missouri Botanical Garden contains a collection of scientific papers on a wide range of botanical topics. It includes studies of specific plant species, as well as broader investigations into plant physiology, ecology, and taxonomy. With contributions from leading botanists of the early 20th century, this volume is an important resource for researchers and students of botany. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.