Cycads

Cycads PDF

Author: John Sydney Donaldson

Publisher: World Conservation Union

Published: 2003

Total Pages: 100

ISBN-13:

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The IUCN/SSC Cycad ACtion Plan brings together the best available information on this ancient and fascinating group of plants. Cycads were a dominant part of the earth's flora during the age of the dinosaurs and many species were common even in more recent times. However, many of the 297 species and subspecies dealt with in the Cycad Action Plan have been badly affected by habitat destruction and plant collecting within the last century. As a result, more than half the known species are now classified as threatened, and the cycads stand out as one of the most threatened groups of plants in this world.The Action Plan provides an overview of all the cycads and the threats to their survival. This is followed by separate assessments for the four broad regions where cycads now occur, namely Africa and the Indian Ocean Islands, Australia, Asia, and the New World. Trade in cycads has had a substantial impact on wild cycad populations and there is a separate chapter on trade and the effectiveness of control measures such as CITES. In addition, with so many species facing extinction in the wild, garden collections have become increasingly important and we have assessed the global status of cycad collections.Finally, the Cycad Action Plan presents a set of objectives and actions to reduce the threat to cycads in the wild and to provide ex situ conservation for those that almost certainly will become extinct in the wild. Wherever possible, we have tried to identify and build on innovative projects, such as community-based nurseries, and to link cycad consideration with other global and local initiatives such as the conservation of biodiversity hotspots.

The Biology of the Cycads

The Biology of the Cycads PDF

Author: Knut Norstog

Publisher: Comstock Publishing Associates

Published: 1997

Total Pages: 424

ISBN-13:

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Thoroughly referenced and generously illustrated, this book discusses all aspects of cycadology. A small group of ancient palmlike seed plants noted for their beautiful foliage and often brightly colored cones and seeds, cycads are believed to have been among the first seed-bearing plants. Seed bearing was the basis for their worldwide dominance from about 300 million years ago to about 70 million years ago, when today's familiar flowering plants gained ascendancy. In recent years, interest in cycads has increased, partly as a result of the need for a more complete identification of the range of toxic and carcinogenic substances these plants produce and partly because of the recognition that some compounds from cycads may prove valuable in biomedical research. Many cycads have recently been identified as endangered species, including some that seem to have survived virtually unchanged since the Mesozoic era. Cycads have a specific importance, now at risk of being lost forever, for the information they offer on the origins and evolution of seed plants. Knut J. Norstog and Trevor J. Nicholls discuss cycad anatomy, reproduction, physiology, and growth. They also focus on population biology and the fossil cycadophytes, as well as genera and species from both the Old World and the New World. The Biology of the Cycads is illustrated with numerous maps, diagrams, and drawings, as well as more than 350 photographs, in black and white and in color.

Cycads of the World

Cycads of the World PDF

Author: David Lloyd Jones

Publisher: Raupo

Published: 1998

Total Pages: 312

ISBN-13: 9781876334093

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This is a comprehensive reference to the cycads of the world. Part One details their biology and cultivation, and pests and diseases to which they are susceptible. The second section provides concise descriptions of each plant, with information on its habitat and distribution, and horticultural information on seed germination, growing conditions and propagation methods where known. Species entries are accompanied by colour photographs and illustrations. This reference is designed to be of interest to scientists and to general readers interested in the conservation and cultivation of cyclads in public and private gardens.

Cycads of the World

Cycads of the World PDF

Author: David L. Jones

Publisher: Hamlyn

Published: 1993

Total Pages: 312

ISBN-13: 9780730103387

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Palm and cycad specialist David L. Jones updates the 1993 publication of this volume, adding 117 recognized taxa (for a total of 302 covered) and including numerous nomenclatural corrections. The first ten chapters address the history, conservation, structure, economic importance, biology, cultivati.

Biodiversity Conservation and Phylogenetic Systematics

Biodiversity Conservation and Phylogenetic Systematics PDF

Author: Roseli Pellens

Publisher: Springer

Published: 2016-02-24

Total Pages: 390

ISBN-13: 3319224611

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This book is about phylogenetic diversity as an approach to reduce biodiversity losses in this period of mass extinction. Chapters in the first section deal with questions such as the way we value phylogenetic diversity among other criteria for biodiversity conservation; the choice of measures; the loss of phylogenetic diversity with extinction; the importance of organisms that are deeply branched in the tree of life, and the role of relict species. The second section is composed by contributions exploring methodological aspects, such as how to deal with abundance, sampling effort, or conflicting trees in analysis of phylogenetic diversity. The last section is devoted to applications, showing how phylogenetic diversity can be integrated in systematic conservation planning, in EDGE and HEDGE evaluations. This wide coverage makes the book a reference for academics, policy makers and stakeholders dealing with biodiversity conservation.

CYCADS WORLD ED 2E

CYCADS WORLD ED 2E PDF

Author: Jones Dl.

Publisher: Smithsonian

Published: 2002-09-17

Total Pages: 456

ISBN-13: 9781588340436

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Cycads superficially resemble palms and are often misidentified as such. However, cycads are actually a unique assemblage of primitive plants that have been around for at least 250 million years. They have become highly sought after for gardens, both private and public, and their present status as endangered plants has engendered an upsurge of interest in their conservation. With Cycads of the World, David Jones has achieved that difficult task of writing a scientifically accurate text, which is both easy to read and to understand. For this second edition David Jones has added information covering over 100 new species and subspecies of cycads, and updated his material on the 200 species from the first edition. Each entry includes a full description, distribution and habitat information, and a detailed cultivation and propagation guide. Over 360 color photographs plus many other illustrations and maps facilitate easy identification for all living species. This second edition of Cycads of the World makes a fine addition to the library of anyone interested in exotic plants, including gardeners, landscape architects, horticulturalists, botanists, and the curious reader alike.

Cycads of the World

Cycads of the World PDF

Author: David L. Jones

Publisher: Soho Press

Published: 2002-09-17

Total Pages: 0

ISBN-13: 1588340430

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Cycads superficially resemble palms and are often misidentified as such. However, cycads are actually a unique assemblage of primitive plants that have been around for at least 250 million years. They have become highly sought after for gardens, both private and public, and their present status as endangered plants has engendered an upsurge of interest in their conservation. With Cycads of the World, David Jones has achieved that difficult task of writing a scientifically accurate text, which is both easy to read and to understand. For this second edition David Jones has added information covering over 100 new species and subspecies of cycads, and updated his material on the 200 species from the first edition. Each entry includes a full description, distribution and habitat information, and a detailed cultivation and propagation guide. Over 360 color photographs plus many other illustrations and maps facilitate easy identification for all living species. This second edition of Cycads of the World makes a fine addition to the library of anyone interested in exotic plants, including gardeners, landscape architects, horticulturalists, botanists, and the curious reader alike.