A key to the North American genera of Stipeae (Poaceae, Pooideae) with descriptions and taxonomic names for species of Eriocoma, Neotrinia, Oloptum, and five new genera: Barkworthia, x Eriosella, Pseudoeriocoma, Ptilagrostiella, and Thorneochloa Author Peterson, Paul M. Department of Botany MRC- 166, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013 - 7012, USA peterson@si.edu Author Romaschenko, Konstantin Department of Botany MRC- 166, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013 - 7012, USA Author Soreng, Robert J. https://orcid.org/0000-0002-8358-4915 Department of Botany MRC- 166, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013 - 7012, USA Author Reyna, Jesus Valdes Departamento de Botanica, Universidad Autonoma Agraria Antonio Narro, Saltillo, C. P. 25315, Mexico text PhytoKeys 2019 2019-07-16 126 89 125 http://dx.doi.org/10.3897/phytokeys.126.34096 journal article http://dx.doi.org/10.3897/phytokeys.126.34096 1314-2003-126-89 FFC2D06D486FF317CE32972BDE2BFF93 3348547 Eriocoma arnowiae (S.L. Welsh & N.D. Atwood) Romasch, comb. nov. Stipa arnowiae S.L. Welsh & N.D. Atwood, Utah Fl. (ed. 3) 799. 2003 [Basionym] ≡ Achnatherum arnowiae (S.L. Welsh & N.D. Atwood) Barkworth, Sida 22(1): 496. 2006. Type: USA, Utah, Kane Co., T43S, R4W, S13, ca. 9 mi E of Johnson Canyon Jct,, 1740 m, 30 May 2003, S. L. Welsh & T. O'Dell 28062 (holotype: BRY; isotypes: GH-00247115 [image!], NY-00887984 [image!], US-3498681!).