J Syst Evol ›› 2020, Vol. 58 ›› Issue (4): 517-526.DOI: 10.1111/jse.12523

• Research Articles • Previous Articles    

Molecular phylogenetic analysis resolves Trisetum (Poaceae: Pooideae: Koeleriinae) polyphyletic: Evidence for a new genus, Sibirotrisetum and resurrection of Acrospelion

Patricia Barberá1,3*, Robert J. Soreng2, Paul M. Peterson2*, Konstantin Romaschenko2, Alejandro Quintanar1, and Carlos Aedo1   

  1. 1Department of Biodiversity and Conservation, Real Jardín Botánico, CSIC, Madrid 28014, Spain
    2Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington DC 20013‐7012, USA
    3Department of Africa and Madagascar, Missouri Botanical Garden, St. Louis, MO 63110, USA
  • Received:2019-03-04 Accepted:2019-05-05 Online:2019-06-22 Published:2020-07-01


To investigate the evolutionary relationships among the species of Trisetum and other members of subtribe Koeleriinae, a phylogeny based on DNA sequences from four gene regions (ITS, rpl32‐trnL spacer, rps16‐trnK spacer, and rps16 intron) is presented. The analyses, including type species of all genera in Koeleriinae (Acrospelion, Avellinia, Cinnagrostis, Gaudinia, Koeleria, Leptophyllochloa, Limnodea, Peyritschia, Rostraria, Sphenopholis, Trisetaria, Trisetopsis, Trisetum ), along with three outgroups, confirm previous indications of extensive polyphyly of Trisetum. We focus on the monophyletic Trisetum sect. Sibirica clade that we interpret here as a distinct genus, Sibirotrisetum gen. nov. We include a description of Sibirotrisetum with the following seven new combinations: Sibirotrisetum aeneum, S. bifidum, S. henryi, S. scitulum, S. sibiricum, S. sibiricum subsp. litorale , and S. turcicum ; and a single new combination in Acrospelion : A. distichophyllum . Trisetum s.s. is limited to one, two or three species, pending further study.

Key words: Acrospelion, Aveneae, grasses, molecular systematics, Poeae,  Sibirotrisetum, taxonomy, Trisetum