Article

Plant Systematics and Evolution

, Volume 248, Issue 1, pp 85-109

Phylogenetic Framework for Trema (Celtidaceae)

  • C. YessonAffiliated withDepartment of Botany, The Natural History MuseumCentre for Plant Diversity and Systematics, School of Plant Sciences, The University of Reading
  • , S. J. RussellAffiliated withDepartment of Botany, The Natural History Museum
  • , T. ParrishAffiliated withDepartment of Botany, The Natural History Museum776 Calle Mandarinas
  • , J. W. DallingAffiliated withDepartment of Plant Biology, Unversity of Illinois
  • , N. C. GarwoodAffiliated withDepartment of Botany, The Natural History Museum Email author 

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Abstract.

We used ITS and trnL sequence data, analyzed separately and combined by MP, to explore species relationships and concepts in Trema (Celtidaceae), a pantropical genus of pioneer trees. Whether Trema is monophyletic or includes Parasponia is still unresolved. Three clades within Trema received moderate to high support, one from the New World and two from the Old World, but their relationships were not resolved. In the New World, specimens of T. micrantha formed two groups consistent with endocarp morphology. Group I, with smaller brown endocarps, is a highly supported clade sister to T. lamarckiana. Group II, with larger black endocarps, is poorly resolved with several subclades, including the highly supported T. integerrima clade. Both Old World clades contain Asian and African species, with three or more species in each region. Trema orientalis is not monophyletic: specimens from Africa formed a highly supported clade sister to T. africana, while those from Asia were sister to T. aspera from Australia.

Key words

Trema Parasponia Celtidaceae tro-pical pioneer trees ITS trnL molecular phylogeny