Vol. 80 No. 2 Suppl. (2025)
Articles

A phylogeny of the Cotteinae (Poaceae, Chloridoideae, Eragrostideae)

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  • Paul M. Peterson,
  • Konstantin Romaschenko,
  • Yolanda herrera Arrieta
Paul M. Peterson
Department of Botany MRC-166, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013-7012, USA
Konstantin Romaschenko
Department of Botany MRC-166, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013-7012, USA
Yolanda herrera Arrieta
Instituto Politécnico Nacional, CIIDIR Unidad‐Durango‐COFAA, Durango, C.P. 34220, México
DOI: https://doi.org/10.36253/jopt-19153

Published 2025-11-17

Keywords

  • classification,
  • Cottea,
  • Enneapogon,
  • Kaokochloa,
  • molecular phylogenetics,
  • Schmidtia
    • ...More
    Less

How to Cite

Peterson, P. M., Romaschenko, K., & herrera Arrieta, Y. (2025). A phylogeny of the Cotteinae (Poaceae, Chloridoideae, Eragrostideae). Webbia, 80(2), 197–205. https://doi.org/10.36253/jopt-19153

Copyright (c) 2025 Paul M. Peterson, Konstantin Romaschenko, Yolanda herrera Arrieta

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

To investigate the evolutionary relationships among 23 species in the Cotteinae we generated a DNA sequence-derived phylogeny utilizing three plastid (rps16-trnK spacer, rps16 intron, rpl32-trnL spacer) regions and the nuclear ribosomal internal transcribed spacer (ITS) region. The Bayesian tree provides strong support for the monophyly of the Cotteinae and its four genera, in order of divergence: Cottea, the Kaokochloa + Schmidtia clade, and the Enneapogon clade. Since the Eragrostideae clearly evolved from African ancestors and Kaokochloa, Schmidtia, and Enneapogon all share species from Africa, we hypothesize the ancestral area of Cotteinae to be Africa. Within Enneapogon we recovered four major clades, the first two splits with species primarily from Africa and the third split containing a basal species from Africa/Asia/Europe sister to all species from Australia. The ancestral area of Enneapogon is Africa and based on our current sample the 13 species from Australia appear to be derived from a single dispersal event from an ancestor shared with E. persicus.

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