This field notebook by Richard Evans Schultes provides a unique look into the biodiversity of the Igara-Paraná River region of Colombia. Schultes was a renowned ethnobotanist who spent much of his career studying traditional medicinal plants in South America. This book is a fascinating glimpse into the fieldwork of one of the pioneers of modern ethnobotany.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.