![]() sphaerocephala as separate genera Psilathera and Sesleriella. This suggests an allopolyploid origin of Sesleria s.str. In contrast, in the plastid phylogeny Sesleria s.str. ![]() sphaerocephala was more distantly related. In the ITS phylogeny tetra- to dodecaploid Sesleria s.str. Finally, we tested previous hypotheses of infrageneric classifications. ![]() ovata should be treated as separate genera Sesleriella and Psilathera as proposed previously, or rather included in Sesleria, following most recent Floras. Our first aim was to determine the relationships among Sesleria and putatively closely related genera. We sequenced the plastid trnL-ndhF region and produced amplified fragment length polymorphisms (AFLPs) from a comprehensive, ploidy-cytotyped sampling including 292 populations, and produced nuclear ribosomal internal transcribed spacer (ITS) sequences for a subsample. Of the more than 40 species only two are diploid, all others are tetra- to dodecaploid, and many species comprise several ploidy cytotypes. It is distributed throughout western Eurasia and North Africa with highest taxonomic diversity on the Balkan Peninsula. Sesleria (Poaceae) is a species-rich, taxonomically difficult genus due to high morpho-anatomical variability and weak differentiation of many species.
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