Kew Bulletin is a peer-reviewed journal that publishes original research articles, review articles, and book reviews on all aspects of plant science, including taxonomy, ecology, and conservation. The journal is published by the Royal Botanic Gardens, Kew, one of the leading botanical research institutions in the world. It is an essential resource for botanists and other plant scientists. 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.