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 occidentalis subsp. californica (Merr. & Burtt Davy) Romasch., comb. nov. Stipa californica Merr. & Burtt Davy, Univ. Calif. Publ. Bot. 1: 61. 1902 [Basionym] ≡ Stipa occidentalis var. californica (Merr. & Burtt Davy) C.L. Hitchc., Vasc. Pl. Pacific NW 1: 715. 1969 ≡ Achnatherum occidentale subsp. californicum (Merr. & Burtt Davy) Barkworth, Phytologia 74(1): 10. 1993. Type: USA, California, San Jacinto Mts., north side of Fullers Ridge, 2100 m, Jul 1901, H.M. Hall 2556 (holotype: unknown; isotypes: CAS-0005660 [image!], US-556911!). Eriocoma occidentalis californica = Stipa nelsonii var. longiaristata Barkworth & J. Maze, Taxon 28(5/6): 623. 1979 ≡ Achnatherum nelsonii subsp. longiaristatum (Barkworth & J. Maze) Barkworth, Phytologia 74(1): 9. 1993. Type: USA, Washington, 8-9 mi W of Spokane, 19 Jun 1940, J.S. Swallen 6231 (holotype: DAO-000465413 [image!]; isotype: US-2303647!).