Gnidia (Thymelaeaceae) is not monophyletic: Taxonomic implications for Thymelaeoideae and a partial new generic taxonomy for Gnidia

Angela J. Beaumont, Trevor J. Edwards, John Manning, Olivier Maurin, Marline Rautenbach, Moleboheng C. Motsi, Michael F. Fay, Mark W. Chase, Michelle Van Der Bank

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

We address the generic limits of Gnidia (Thymelaeaceae) through a phylogenetic analysis of nuclear ribosomal DNA internal transcribed spacer (ITS) and plastid rbcL, trnL intron and trnL-F intergenic spacer regions. Maximum parsimony and Bayesian inference were used to produce trees and assess internal support. The most significant conclusion drawn from the molecular analysis is that Gnidia is polyphyletic as currently circumscribed, comprising at least four distinct lineages that are each related to other genera within Thymelaeoideae. Gnidia pinifolia and G. racemosa are members of a clade within which Struthiola is embedded; a second group of species allies with Drapetes as sister to Passerina; and a third lineage corresponds to the previously recognized genus Lasiosiphon. The remaining species of Gnidia included in this study are allied with the Australian genus Pimelea. The taxonomic implications of these findings are discussed in relation to the principle of monophyly.

Original languageEnglish
Pages (from-to)402-417
Number of pages16
JournalBotanical Journal of the Linnean Society
Volume160
Issue number4
DOIs
Publication statusPublished - Aug 2009

Keywords

  • Internal transcribed spacer (ITS)
  • Lasiosiphon
  • Molecular systematics
  • Passerina
  • Pimelea
  • RbcL
  • Struthiola
  • TrnL-F

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science

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