Pseudognaphalium aldunateoides back in gnaphalium (compositae: Gnaphalieae)

A. Acosta-Maindo, M. Galbany-Casals

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1 Citation (Scopus)

Abstract

© 2018 CSIC. Generic classifcation of some members of the tribe Gnaphalieae (Compositae) and in particular the generic delimitation of the old genus Gnaphalium has been long problematic. The genus Pseudognaphalium was frst split from Gnaphalium based on morphology and later supported by molecular phylogenies. However, the generic identity of some species remains doubtful. Here we provide a morphological study of Pseudognaphalium aldunateoides, which is compared with the type species of Gnaphalium (Gnaphalium uliginosum) and Pseudognaphalium (Gnaphalium oxyphyllum). We also include the three species in a nuclear ribosomal DNA (nrDNA) and a plastid (cpDNA) molecular phylogeny of the tribe Gnaphalieae. Our results show that P. aldunateoides has a dimorphic pappus, character not present in the genus Pseudognaphalium but characteristic of the genus Gnaphalium. It also shows a stereome with intermediate features between the undivided stereome typical of Gnaphalium and the fenestrated stereome typical of Pseudognaphalium. In the nrDNA and the cpDNA trees, P. aldunateoides is placed within the Gnaphalium s. str. clade, not closely related to Pseudognaphalium. With all these evidence, we conclude that P. aldunateoides is correctly placed in Gnaphalium.
Original languageEnglish
Article numbere012
JournalCollectanea Botanica
Volume37
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • Asteraceae
  • ETS
  • ITS
  • Micromorphology
  • Molecular phylogeny
  • Pappus
  • Rpl32-trnL intergenic spacer
  • Stereome

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