Molecular phylogenetics of cool-season grasses in the subtribes Agrostidinae, Anthoxanthinae, Aveninae, Brizinae, Calothecinae, Koeleriinae and Phalaridinae (Poaceae, Pooideae, Poeae, Poeae chloroplast group 1) Author Saarela, Jeffery M. Botany Section, Research and Collections, Canadian Museum of Nature, Ottawa, Ontario, Canada jsaarela@mus-nature.ca Author Bull, Roger D. Botany Section, Research and Collections, Canadian Museum of Nature, Ottawa, Ontario, Canada Author Paradis, Michel J. Botany Section, Research and Collections, Canadian Museum of Nature, Ottawa, Ontario, Canada Author Ebata, Sharon N. Botany Section, Research and Collections, Canadian Museum of Nature, Ottawa, Ontario, Canada Author Paul M. Peterson, Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington, DC, United States of America Author Soreng, Robert J. Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington, DC, United States of America Author Paszko, Beata Department of Vascular Plant Systematics and Phytogeography, W. Szafer Institute of Botany, Polish Academy of Sciences, Krakow, Poland text PhytoKeys 2017 2017-10-09 87 1 139 http://dx.doi.org/10.3897/phytokeys.87.12774 journal article http://dx.doi.org/10.3897/phytokeys.87.12774 1314-2003-87-1 6960C940FFA73F60FFA87436FF86811D 1137949 Calamagrostis x don-hensonii (Reznicek & Judz.) Saarela comb. nov. Basionym. x Calammophila don-hensonii Reznicek & Judz., Michigan Bot. 35: 36. 1996. Type: USA: Michigan, Alger Co., Grand Island, Williams Landing, along shore in section 22, T47N, R19W, south shore of Island ca. 5 1/4 km NW of Munising, 9 Jul 1991, Reznicek , Henson , Henson & D. Tiller 8827 (holotype MICH! [1108624], isotype US! [US-3537125 barcode 00955513]).