New Combinations and New Names in American Cinnagrostis, Peyritschia, and Deschampsia, and Three New Genera: Greeneochloa, Laegaardia and Paramochloa (Poeae, Poaceae)

Based on morphological and molecular evidence we present new combinations or new names for 77 taxa of Cinnagrostis, seven taxa of Deschampsia, and 24 taxa of Peyritschia; and describe three new genera, Greeneochloa P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. (subtribe Echinopogoninae), Paramochloa P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. (subtribe Calothecinae), and Laegaardia P.M. Peterson, Soreng, Romasch. & Barberá, gen. nov. (subtribe Calothecinae) with two, two and one species, respectively. In addition to the 116 new taxonomic entities, we provide a key to the genera of American grasses presently or formerly treated in Calamagrostis or Deyeuxia and generic emendations for Cinnagrostis and Peyritschia.