Cycad Classification ：Concepts and Recommendations

Publication subTitle ：Concepts and Recommendations

Author： Walters   T.;Osborne   R.  

Publisher： CABI Publishing‎

Publication year： 2004

E-ISBN: 9780851998718

P-ISBN(Hardback):  9780851997414

Subject： S6 Gardening

Keyword： Horticulture

Language： ENG

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Description

Cycads resemble palms, but are taxonomically quite different. They are a significant and irreplaceable component of the planet's biological diversity, having evolved various and often unique morphological, anatomical and biochemical features during their 250-million-year evolutionary history. Many cycad species exist today only as small, poorly-known or isolated populations or as ornamental species in botanic gardens. In order to understand fully, as well as to conserve, this internationally endangered tropical plant group, it is paramount that cycad systematics is studied, documented and refined.This volume presents the current state of our knowledge of the systematics of the approximately 300 species of cycads. It includes contributions from leading researchers from Australia, China, Italy, Mexico, South Africa, Thailand and the USA. It has been developed from papers presented at a workshop held in 2002 at the Montgomery Botanical Center.

Chapter

Contributors

About the Editors

Preface

Acknowledgements

1 ‘We Hold these Truths …’

2 Saving Ghosts? The Implications of Taxonomic Uncertainty and Shifting Infrageneric Concepts in the Cycadales for Red Listing and Conservation Planning

3 Character Evolution, Species Recognition and Classification Concepts in the Cycadaceae

4 Morphological Characters Useful in Determining Species Boundaries in Cycas (Cycadaceae)

5 Comments on Cycas, Dyerocycas and Epicycas (Cycadaceae)

6 Classification Concepts in Encephalartos (Zamiaceae)

7 Classification Concepts in Macrozamia (Zamiaceae) from Eastern Australia

8 Classification Concepts in Ceratozamia (Zamiaceae)

9 Relationships and Phytogeography in Ceratozamia (Zamiaceae)

10 A Morphometric Analysis of the Ceratozamia norstogii Complex (Zamiaceae)

11 Hypotheses on the Relationship between Biogeography and Speciation in Dioon (Zamiaceae)

12 Molecular Phylogeny of Zamia (Zamiaceae)

13 Systematics of Meso-American Zamia (Zamiaceae)

14 Zamiaceae of Bolivia, Ecuador and Peru

15 In Search of the True Tree: Guidelines for Classification

Appendix 1: The World List of Cycads

Appendix 2: Glossary of Terms Encountered in Cycad Systematics

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