Family relationships of the enigmatic rosid genera Barbeya and Dirachma from the Horn of Africa region

Mats Thulin, Birgitta Bremer, James Richardson, Jonas Niklasson, Michael F. Fay, Mark W. Chase

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

25 Citas (Scopus)

Resumen

Barbeya is a monotypic genus in the Horn of Africa and adjacent parts of Arabia. It is usually treated as the family Barbeyaceae and regarded as an aberrant member of Urticales. Dirachma, with one species on Socotra and one in Somalia, is usually treated as the family Dirachmaceae, in Geraniales, but a position in Malvales has also been suggested. Analyses of molecular data, from both rbcL and trnL-F, indicate that Barbeya and Dirachma are closely related inter se as well as to Rhamnaceae and Elaeagnaceae. In an analysis based on morphology Barbeya groups with Elaeagnaceae, and Dirachma with Rhamnaceae and Ulmaceae. In a combined molecular and morphological analysis Barbeya is the sister group of Elaeagnaceae and Dirachma is the sister group of the whole Barbeya-Elaeagnaceae-Rhamnaceae clade. However, the support for these arrangements is weak and, rather than merging Barbeyaceae with Dirachmaceae as suggested by the molecular analysis or with Elaeagnaceae as suggested by the morphological and combined analyses, it seems best to retain both Barbeyaceae and Dirachmaceae in their present circumscriptions, but in both cases in completely new positions in the angiosperm system. The results are compatible with a new circumscription of Rhamnales comprising Rhamnaceae, Elaeagnaceae, Dirachmaceae and Barbeyaceae.

Idioma originalInglés estadounidense
Páginas (desde-hasta)103-119
Número de páginas17
PublicaciónPlant Systematics and Evolution
Volumen213
N.º1-2
DOI
EstadoPublicada - 1998
Publicado de forma externa

All Science Journal Classification (ASJC) codes

  • Ecología, evolución, comportamiento y sistemática
  • Botánica

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