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Cycad classification: concepts and recommendations.

Book cover for Cycad classification: concepts and recommendations.


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 clarifying what has been a confused area of research. Two appendices are included in this volume. The fi...


Chapter 12 (Page no: 149)

Molecular phylogeny of Zamia (Zamiaceae).

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 divided in various, often poorly resolved, clades. The most inclusive dichotomy defines two groups: one composed of mainly Central American species, i.e. Z. acuminata, Z. neurophyllidia, Z. obliqua, Z. pseudoparasitica and Z. skinneri; and the other including the rest of the investigated species. The latter clade basally shows Z. inermis and, more internally, a small unit composed of one Mexican and two West Indian taxa (Z. fischeri, Z. portoricensis and Z. pumila). This group is in a sister group relationship with a large, poorly resolved clade which has Z. standleyi at the base. The internal clade includes Z. soconuscensis and two groups, one made of North American species and the other of mainly South American species. The first group includes Z. furfuracea, Z. loddigesii, Z. paucijuga, Z. polymorpha and Z. verschaffeltii. The other group includes mainly South American taxa (i.e. Chiqua restrepoi, Zamia muricata, Z. boliviana, Z. leicontei, Z. manicata, Z. roezlii and Z. wallisii). The results indicate that morphological resemblance in the genus does not correspond to the pattern of phylogenetic relationships, whereas the latter pattern is broadly congruent with geographical distribution.

Other chapters from this book

Chapter: 1 (Page no: 1) 'We Hold these Truths ...'. Author(s): Walters, T. Osborne, R. Decker, D.
Chapter: 2 (Page no: 13) Saving ghosts? The implications of taxonomic uncertainty and shifting infrageneric concepts in the cycadales for red listing and conservation planning. Author(s): Donaldson, J.
Chapter: 3 (Page no: 23) Character evolution, species recognition and classification concepts in the Cycadaceae. Author(s): Hill, K. D.
Chapter: 4 (Page no: 45) Morphological characters useful in determining species boundaries in Cycas (Cycadaceae). Author(s): Lindström, A.
Chapter: 5 (Page no: 57) Comments on Cycas, Dyerocycas and Epicycas (Cycadaceae). Author(s): Chen ChiaJui Hill, K. D. Stevenson, D. W.
Chapter: 6 (Page no: 69) Classification concepts in Encephalartos (Zamiaceae). Author(s): Vorster, P.
Chapter: 7 (Page no: 85) Classification concepts in Macrozamia (Zamiaceae) from Eastern Australia. Author(s): Forster, P. I.
Chapter: 8 (Page no: 95) Classification concepts in Ceratozamia (Zamiaceae). Author(s): Whitelock, L. M.
Chapter: 9 (Page no: 109) Relationships and phytogeography in Ceratozamia (Zamiaceae). Author(s): Vovides, A. P. Pérez-Farrera, M. A. González, D. Avendaño, S.
Chapter: 10 (Page no: 127) A morphometric analysis of the Ceratozamia norstogii complex (Zamiaceae). Author(s): Pérez-Farrera, M. A. Vovides, A. P. Hernández-Sandoval, L. González, D. Martínez, M.
Chapter: 11 (Page no: 137) Hypotheses on the relationship between biogeography and speciation in Dioon (Zamiaceae). Author(s): Gregory, T. J. Chemnick, J.
Chapter: 13 (Page no: 159) Systematics of Meso-American Zamia (Zamiaceae). Author(s): Schutzman, B.
Chapter: 14 (Page no: 173) Zamiaceae of Bolivia, Ecuador and Peru. Author(s): Stevenson, D. W.
Chapter: 15 (Page no: 195) In search of the true tree: guidelines for classification. Author(s): Osborne, R. Walters, T.

Chapter details

  • Author Affiliation
  • Dipartimento di Biologia Vegetale, Università degli Studi di Napoli Federico II, Via Foria 223, 80139 Napoli, Italy.
  • Year of Publication
  • 2004
  • ISBN
  • 9780851997414
  • Record Number
  • 20043021923