This book presents the current state of our knowledge of the systematics of the approximately 300 species of cycads. It has been developed from 15 papers presented at the conference in Miami. Guidelines are presented for the designation of species, species boundaries and species groupings, thus...

In order to develop classification guidelines for the Cycadales, a workshop was held in April 2002, at Montgomery Botanical Center in Miami, Florida, USA. Fourteen internationally-renowned cycad systematists spent 3 days identifying and developing guidelines that would provide a stable, practical...

The central goal in cycad systematics is to uncover the 'true tree' that correctly represents the hierarchy of relationships within the Cycadales. Consensus reached at the Cycad Classification Concepts Workshop in Miami in April 2002 is that the cycads are a monophyletic group, that a species is...

Species relationships and phytogeography of Ceratozamia, an endangered neotropical cycad genus, based on morphology, leaflet histology, DNA sequencing and ecological data, are analysed and discussed. Seven species complexes are assigned within the genus. A centre of origin in south-eastern Mexico,...

The three species forming the Ceratozamia norstogii complex (C. alvarezii, C. mirandae and C. norstogii) are found in adjacent areas of the Sierra Madre de Chiapas in Mexico. Taxonomic limits within this complex have not yet been fully defined, but are investigated in this project. Twenty...

A comparison of the cycad Red Lists from 1978 to 2002 shows that taxonomy has had a profound influence on the outcomes of the Red List process. The descriptions of new species, as well as taxonomic revisions, have increased the number of recognized cycad taxa from 136 in 1978, to over 300 at the...

Hypotheses are presented on the relationships between palaeoclimatic conditions during the late Pleistocene and Holocene, and the current biogeography of cycads in the genus Dioon. A proposal is made that Dioon populations have migrated up and down in elevation, and north and south, with the...

The preliminary results of a phylogenetic analysis of genus Zamia, based on the sequences of the internal transcribed spacer 2 of the nuclear ribosomal DNA combined with a morphological data set, are reported. The consensus tree among the six equally parsimonious cladograms obtained shows Zamia...

The author's work includes morphological, geographical and phenetic analyses of Meso-American Zamia representatives and is a continuation of earlier Master's and Doctoral studies. This research has led to the publication of six new species descriptions; in addition, several others are in progress,...

Ten previously known species of Zamia from Bolivia, Ecuador and Peru are discussed and a new species from Peru, Zamia macrochiera, is described. Keys to all 11 species are given as well as complete descriptions, synonymy, types, exsiccata, distributional data and conservation status as used in the ...